Title of Invention	HERBICIDAL COMPOSITION
Abstract	The present invention relates to selectively herbicidal composition for controlling grassed and weeds of usefull plants, comprising a) a herbicidally effective amount of a compound of formula I b) an amount, which is effective for antagonism of the herbicide, of a safener of formula IIa wherein the substituents are as defuned ub the claims.

Full Text

Herbicidal composition The present invention relates to new selectively herbicidal compositions for controlling grasses and weeds in crops of useful plants, especially in crops of cereals, maize and sorghum, which compositions comprise a herbicide and a safener (counter-agent, antidote) and protect the useful plants, but not the weeds, against the phytotoxic action of the herbicide, and also to the use of the compositions for controlling weeds in crops of useful plants. When using herbicides, the cultivated plants may also suffer considerable damage, depending on, for example, the amount of herbicide and the method of application, the species of cultivated plant, the nature of the soil and climatic conditions, for example hours of daylight, temperature and amounts of rainfall. In order to deal with that and similar problems, various substances have already been proposed as safeners. which are capable of antagonising the harmful effect of the herbicide on the cultivated plant, that is to say are capable of protecting the cultivated plant, without appreciably impairing the herbicidal action on the weeds to be controlled. It has been found that the proposed safeners often act very specifically both with respect to the cultivated plants and with respect to the herbicide, and in some cases also in dependence on the method of application, that is to say, a particular safener is often suitable only for a particular cultivated plant and a specific class of herbicidal substance or a particular herbicide. For example, WO 96/21652 and WO 99/47525 disclose compounds that protect the cultivated plants from the phytotoxic action of herbicides such as, for example, 3-hydroxy-4-aryl-5-oxopyra2oline derivatives. It has now been found that compounds of formula lla are suitable for protecting cultivated plants from the phytotoxic action of a particular class of specific, substituted 3-hydroxy-4-aryl-5-oxopyrazoline herbicides. Accordingly, a selectively herblcidal composition is proposed according to the invention which, in addition to customary inert formulation assistants, for example carriers, solvents and wetting agents, comprises as active ingredient a mixture of a) a herbicidally effective amount of a herbicide of formula I (I). wherein Ri and R3 are, each independently of the other, ethyl, haloethyl, ethynyl, d- or C2-alkoxy, Ci- or Ca-haloalkoxy, Cr or Ca-alkylcarbonyj or Ci- or C2-hydroxyalkyl; R4 and Rs together are a group Z2 ■CR,4(Ri5)-CRi6(Ri7)-0-CRi8(Ri9)-CR2o(R2i)- (Z2); Ri4, Ri5, R16, Ri7, R18, Ri9, R20 and R21 are, each independently of the others, hydrogen, halogen, CrC4alkyl or Ci-C4haloalkyl, wherein an alkylene ring may be fused or spiro-bound to the carbon atoms of the group Z2, which alkylene ring, together with the carbon atoms of the group Z2, to which it is bonded, contains from 2 to 6 carbon atoms and may be interrupted by oxygen, or the alkylene ring bridges at least one ring atom of the group Z2; G is hydrogen, -C(Xi)-R3o, -C(X2)-X3-R3i, -C(X4)-NR32(R33), -S(0)2-R34, -P(X5)R35R36, -CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4, X5 and Xe are, each independently of the others, oxygen or sulfur; Raoi R31. R32» R33. R34, R35, R36 and R37 are, each independently of the others, hydrogen, Ci-CioalkyI, CrCiohaloalkyI, Ci-CiocyanoalkyI, CrCionitroalkyI, CrCioaminoalkyI, C2-C5-alkenyl, C2-C5haloalkenyl, Cs-CscycloalkyI, Ci-Csalkylamino-CrCsalkyI, di(CrC5alkyl)amino-Ci-Csalkyl, C3-C7cycloalkyl-CrC5alkyl, CrCsalkoxy-Ci-Csaikyl, C3-C5alkenyloxy-CrC5alkyl, Cs-Csalkynyloxy-CrCsalkyJ, CrCsalkyJthio-CrCsaJkyl, CrCsalkylsulfoxy-CrCsalkyI, C1-C5-alkylsulfonyl-Ci-Csalkyl, C2-C8alkylideneaminooxy-Ci-C5alkyI, Ci-Csalkylcarbonyl-Ci-CsalkyI, Ci-Csalkoxycarbonyl-CrCsalkyJ, Ci-Csalkylaminocari^onyl-CrCsalkyl, di(CrC5alkyl)amino-carbonyl-Ci-CsalkyJ, CrCsalkylcarbonylamino-CrCsalkyl, CrCsalkylcarbonyKCi-Csalkyl)-amino-Ci-Csalkyl, tri(Cr or Ca-alkyOsilyl-Ci-CsalkyI, phenyl, heteroaryl, phenyl-CrCsalkyI, heteroaryl-Ci-Csalkyi, phenoxy-CrCsalkyI or heteroaryloxy-Ci-CsalkyI, wherein the afore¬mentioned aromatic rings may be substituted by halogen, nitro, cyano, amino, di(Ci-C4alkyl)amino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, cariDoxyl, CrCsalkoxycarbonyl or by Cr or C2-haIoalkyl; R34, R35 and R36 are, in addition, CrCioalkoxy, Ci-Ciohaloalkoxy, CrCsalkylamino, di(Ci-C5-alkyl)amino, benzyloxy or phenoxy, wherein the aromatic rings of the last two substituents may be substituted by halogen, nitro. cyano, amino, dimethylamino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csaikoxycarbonyl or by Ci- or C2-haloalkyl; and R37 is, in addition, CrCioalkylcarbonyl, or a salt or diastereoisomer of a compound of formula I, and b) an amount, which is effective for antagonism of the herbicide, of a safener of formula lla R^OOC /^N COOR22 (lla), wherein R22 is hydrogen, or an alkali metal, alkaline earth metal, sulfonium or ammonium cation, or ethyl, or of formula lib (lib). wherein R23 is hydrogen, or an alkali metal, alkaline earth metal, sulfonium or ammonium cation, or ethyl, or of formula lie (lie), wherein R24 and R25 are, each independently of the other, hydrogen, Ci-CealkyI, C2-C6- alkenyl, C2-C6alkynyl or Cs-Cecycioalkyl; R26 is hydrogen, halogen, Ci-C4alkyl, Ci-Cehaloalkyi or Ci-Cehaloalkoxy; or the radicals R26 are, each independently of the other(s), hydrogen, halogen, CrC4alkyl, Ct-CehaloalkyI or Ci-Cehaloalkoxy; R27 is hydrogen, halogen, Ci-C4alkyl, CrC4haloalkyl, CrC4alkoxy, Ci-C4haloalkoxy, CrC4- alkylthio. Ct-C4alkoxycarbonyl or nitro; or the radicals R27 are, each independently of the other, hydrogen, halogen, Ci-C4alkyl, CrC4haloalkyl, CrC4alkoxy, CrC4haloaIkoxy, Ct-C4" alkylthio, CrC4alkoxycarbonyl or nitro; n is 0, 1, 2 or 3; and m is 1 or 2, or of formula lid (lid). wherein R28 is hydrogen, Ci-Cealkyi, Ci-Cealkoxy, CrCealkylthio, Ca-CscycloalkyI, phenyl, phenyl- CrCealkyI or heteroaryl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, hydroxy, carboxyl, formyl, carbonamide or by sulfonamide; R29 is hydrogen, CrCealkyI or CrC4haloalkyl; R30 is hydrogen, halogen, CrC4alkyl, Ci-C4haIoalkyl, CrC4alkoxy, CrC4alkylthio, CrC4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; or the radicals R30 are, each independently of the other, hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, Ci-C4alkoxy, CrC4alkylthio, CrC4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; Rai is hydrogen, d-Cealkyl or CrC4haloalkyl; R32 is hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, CrC4alkoxy, Ci-C4alkyllhio, CrC4alkyi- sulfonyl, cyano, nitre, formyl or carboxyl; or the radicals R32 are. each independently of the other, hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, CrC4alkoxy, Ci-C4alkylthio, CrC4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; and o and p are, each independently of the other, 0, 1 or 2, or of formula lie R (lie). wherein G2 is hydrogen, formyl, Ci-Cealkylcarbonyl, Ca-Cealkenylcarbonyl, Ca-Cealkynylcarbonyl, CrCealkoxycarbonyl. (Ci-C6alkylthio)carbonyl. Cs-Cecycloalkylcarbonyl, phenyi-CrCealkyl- carbonyl, phenylcarbonyl. Ct-Cealkylsulfonyl. Ca-Cealkenylsulfonyl or phenylsulfonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R33 is hydrogen, Ci-CealkyI, C2"C6alkenyl, C2-C6alkynyl, Cs-CscycloalkyI, formyl, CrCealkyl- carbonyl, Cz-Cealkenylcarbonyl, C2-C6alkynylcarbonyl, CrCealkoxycarbonyl, (CrCealkylthio)- carbonyl. Cs-Cscycloalkylcarbonyl, CrCealkylsulfonyl, Ca-Cealkenylsulfonyl or phenylsulfonyl. wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R34 is hydrogen. CrCealkyI, Ca-Cealkenyl. C2-C6alkynyl, Ca-Cscycloalkyl, formyl, CrCealkyl- carbonyl, C2-C6alkenylcarbonyl, C2-C6alkynylcarbonyl, CrCealkoxycarbonyl. (CrCealkylthio)- carbonyl, Ca-Cscycloalkylcarbonyl, CrCealkylsulfonyl, C2-C6alkenylsulfonyl or phenylsulfonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R35. R36, R37 and R38 are, each independently of the others, hydrogen, halogen, amino, Cr Caalkylamino, di(CrC3alkyl)amino, hydroxy, cyano, nitro, formyl, carboxyl, CrCealkoxy, CrCehaloalkoxy, CrCealkylcarbonyl, CrCealkoxycarbonyl, CrCgalkyl, CrCahaloalkyI, C2-C6- alkenyl or C2-C6alkynyl; or Ras and R33, together with the ring atoms to which they are bonded, form a five- or six-membered saturated or unsaturated ring that contains up to 2 identical or different hetero atoms selected from the group oxygen, sulfur and nitrogen and that may be interrupted by a -C(0)- radical. Depending on the substituents Ri, R3, R4, R5 and G, the compounds of formula I may be in the form of geometric and/or optical isomers and isomeric mixtures (atropisomers) and, when G is hydrogen, a metal ion equivalent, a sulfonium cation or an ammonium cation, in the form of tautomers and tautomeric mixtures. The present invention also includes the salts that the compounds of formula I may form with acids. Suitable acids for the formation of acid addition salts are both organic and inorganic acids. Examples of such acids are hydrochloric acid, hydrobromic acid, nitric acid, phosphoric acids, sulfuric acid, acetic acid, propionic acid, butyric acid, valeric acid, oxalic acid, malonic acid, fumaric acid, organic sulfonic acids, lactic acid, tartaric acid, citric acid and salicylic acid. The compounds of formula I wherein G is hydrogen can, because of their acidity, readily be converted, in the presence of bases (proton acceptors), into the corresponding salts (wherein G is, for example, a metal ion equivalent or an ammonium cation), as described, for example, in EP-A-0 508 126. Any conventional proton acceptor can be used as the base. The salts are, for example, alkali metal salts, e.g. sodium and potassium salts; alkaline earth metal salts, e.g, calcium and magnesium salts; ammonium salts, that is to say unsubstituted ammonium salts and mono- or poly-substituted ammonium salts, e.g. triethylammonium and methylammonium salts, or are salts with other organic bases or other cations, e.g. sulfonium cations. Sulfonium cations are, for example, tri(CrC4alkyl)sulfonium cations, which can be obtained from the corresponding alkali metal salts, for example by salt conversion, for example using a cation exchanger. Among the alkali metal and alkaline earth metal hydroxides used as salt formers, emphasis is to be given to, for example, the hydroxides of lithium, sodium, potassium, magnesium or calcium, but especially those of sodium and potassium. Suitable salt formers are described, for example, in WO 97/41112. Examples of suitable amines for ammonium salt formation that come into consideration are ammonia as well as primary, secondary and tertiary Ci-Cisalkyiamines, CrC4hydroxyalkyl-amines and C2-C4alkoxyalkylamines, for example methylamine, ethylamine, n-propylamine, isopropylamine, the four butylamine isomers, n-amylamine, isoamylamine, hexylamine. heptylamine, octylamine, nonylamine, decylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, methyl-ethylamine, methyl-isopropylamine, methyl-hexylamine, methyl-nonylamine, methyl-pentadecylamine, methyl-octadecylamine, ethyl-butylamine, ethyl-heptylamine, ethyl-octylamine, hexyl-heptylamine. hexyl-octylamine, dimethylamine, diethylamine, di-n-propylamine, diisopropylamine, di-n-butylamine, di-n-amylamine, diisoamylamine, dihexylamine, diheptylamine, dioctylamine, ethanolamine, n-propanolamine, isopropanolamine, N,N-diethanolamine, N-ethylpropanolamine, N-butyl-ethanolamine, allylamine, n-butenyl-2-amine, n-pentenyl-2-amine, 2.3-dimethylbutenyl-2-amine, dibutenyl-2-amine, n-hexenyl-2-amine, propylenediamine, trimethylamine, triethyl-amine, tri-n-propylamine, triisopropylamine, tri-n-butylamine, triisobutylamine, tri-sec-butylamine, tri-n-amylamine, methoxyethylamine and ethoxyethylamine; heterocyclic amines, for example pyridine, quinoline, isoquinoline, morpholine, N-methylmorpholine, thio-morpholine, piperidine, pyrrolidine, indoline, quinuclidine and azepine; primary aryl amines, for example anilines, methoxyanilines, ethoxyanilines, o-, m- and p-toluidines, phenylene-diamines, benzidines, naphthylamines and o-, m- and p-chloroanilines; but especially triethylamine, isopropylamine and diisopropylamine. In the above definitions, halogen is to be understood as fluorine, chlorine, bromine or iodine, preferably fluorine, chlorine or bromine. The alkyl groups occurring in the substituent definitions are, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl or tert-butyl, and the pentyl, hexyl, heptyl, octyl, nonyl and decyl isomers, HaloalkyI groups preferably have a chain length of from 1 to 6 carbon atoms, Haloalkyl is, for example, fluoromethyl, difluoromethyl. difluorochloromethyl, trifluoromethyl, chloromethyl, dichloromethyl, dichlorofluoromethyl, trichloromethyl, 2,2,2-trifluoroethyl, 2-fluoroethyl, 2-chloroethyl, 2,2-difluoroethyl, 2,2-dichloroethyl, 2,2,2-trichloroethyl or pentafluoroethyl, preferably trichloromethyl, difluoromethyl, difluorochloromethyl, trifluoromethyl or dichlorofluoromethyl. Alkoxy groups preferably have a chain length of from 1 to 6 carbon atoms. Alkoxy is, for example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, lert-butoxy, or a pentyloxy or hexyloxy isomer, preferably methoxy, ethoxy or n-propoxy. Haloalkoxy is, for example, fluoromethoxy, difluoromethoxy, trifluoromethoxy, 2,2,2-trifIuoro-ethoxy, 1,1,2,2-tetrafluoroethoxy, 2-fluoroethoxy, 2-chloroethoxy or 2,2,2-trichioroethoxy. There may be mentioned as examples of alkenyl radicals vinyl, allyl, methallyl, 1-methylvinyl, but-2-en-1-yl, pentenyl and 2-hexenyl; preferably alkenyl radicals having a chain length of from 2 to 6 carbon atoms. There may be mentioned as examples of alkynyl radicals ethynyl, propargyl, 1-methyl-propargyl, 3-butynyl, but-2-yn-1-yl, 2-methylbut-3-yn-2-yl, but-3-yn-2-yl, 1-pentynyl, pent-4-yn-1-yl and 2-hexynyl; preferably alkynyl radicals having a chain length of from 2 to 6 carbon atoms. Suitable haloalkenyl radicals include alkenyl groups substituted one or more times by halogen, halogen being in particular bromine or iodine and especially fluorine or chlorine, for example 2- and 3-fluoropropenyl, 2- and 3-chloropropenyl, 2- and 3-bromopropenyl, 2,2-dif!uoro-1-methylvinyl, 2,3,3-trifluoropropenyl, 3.3,3-trifluoropropenyl, 2,3,3-trichloropropenyl, 4,4,4-trifluorobut-2-en-1-yl and 4,4,4-trichlorobut-2-en-1-yl. Preferred alkenyl radicals substituted once, twice or three times by halogen are those having a chain length of from 2 to 5 carbon atoms. The alkenyl groups may be substituted by halogen at saturated or unsaturated carbon atoms. Alkenyloxy is, for example, allyloxy, methallyloxy or but-2-en-1-yloxy. Alkynyloxy is, for example, propargyloxy or 1-methylpropargyloxy. Alkoxyalkyl groups have preferably from 2 to 10 carbon atoms. Alkoxyalkyl is, for example, methoxymethyl, methoxyethyl, ethoxymethyl, ethoxyethyl, n-propoxymethyl, n-propoxyethyl, isopropoxymethyl or isopropoxyethyl. Suitable cycloalkyi substituents contain from 3 to 8 carbon atoms and are, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl. Aikylcarbonyl is especially acetyl or propionyl. Alkoxycarbonyl is, for example, methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, isopropoxycarbonyl or a butoxycarbonyl, penlyloxycarbonyl or hexyloxycarbonyl isomer, preferably methoxycarbonyl or ethoxycarbonyl. Phenyl perse or as part of a substituent, for example phenoxyalkyi or benzyloxy, may be in substituted form, in which case the substituents may, as desired, be In the ortho-, meta-and/or para-position. Preferred positions for the substituents are the ortho- and para-position to the ring attachment point. Phenyl substituents are, for example, halogen, Ct- or Ca-haloalkyI, hydroxy, d- or Ca-alkoxy, Ci-Csalkoxycarbonyl, d- or C2alkylthio, formyl, acetyl, propionyl, carboxyl, nitro, cyano, amino or dimethylamino. Alkylthio groups preferably have a chain length of from 1 to 5 carbon atoms. Alkylthio is, for example, methylthio, ethylthio, propylthio, butylthio, pentylthio or hexylthio. or a branched isomer thereof, but is preferably methylthio or ethylthio. Alkylsulfoxy is, for example, methylsulfoxy, ethylsulfoxy, n-propylsulfoxy, isopropylsulfoxy, n-butylsulfoxy, isobutylsulfoxy, sec-butylsulfoxy or tert-butylsulfoxy, preferably methylsulfoxy or ethylsulfoxy. Alkylsulfonyl is, for example, methylsulfonyl, ethylsulfonyl, n-propylsulfonyl, isopropylsulfonyl, n-butylsulfonyl, isobutylsulfonyl, sec-butylsulfonyl or tert-butylsulfonyl, preferably methylsulfonyl or ethylsulfonyl. Alkylamino is, for example, methylamino, ethylamino, n-propylamino, isopropylamino or a butyl- or pentyl-amine isomer. Dialkylamino is, for example, dimethylamino, methylethylamino, diethylamino, n-propyl-methylamino, dibutylamino or diisopropylamino. Alkyithioalkyl is, for example, methylthiomethyl. methyithioethyl, ethylthiomethyl, ethylthio-ethyl, n-propylthiomethyl, n-propylthioethyl, isopropylthiomethyl or isopropylthioethyl. HydroxyalkyI is, for example, hydroxymethyl, 2-hydroxyethyl or 3-hydroxypropyl. CyanoalkyI is, for example, cyanomethyl, cyanoethyl, cyanoeth-1-yl or cyanopropyl. AminoalkyI is, for example, aminomethyl, aminoethyl, aminoeth-1-yl or aminopropyl. NitroalkyI is, for example, nitromethyl, 2-nitroethyl or 3-nitropropyl. Alkylideneaminooxy-alkyl radicals are oxime ether substituents, for example having the H following structure /Qx / Carbonamide and sulfonamide radicals, for example in the definition of R28, have the structures -C(0)NH2 and -S(0)2NH2, respectively. Heteroaryl radicals perse or as part of a substituent, for example heteroaryloxy-alkyi, are usually 5- or 6-membered aromatic heterocycles that contain preferably from 1 to 3 hetero atoms, such as N, S and/or O. Examples of suitable heteroaryl radicals are pyridyl, pyrimidyl, thienyl, triazinyl, thiazolyl, triazolyl, thiadiazolyl, imidazolyl, oxazolyl, isoxazolyl, pyrazinyl, furyl, pyrazolyl, benzoxazolyl, benzothiazolyl, quinoxalyl, indolyl and quinolyl, Those heteroaromatic radicals may, in addition, be substituted, for example by halogen, d-or C2-haloalkyl, hydroxy, Cr or Ca-alkoxy, Cr or Caalkylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csalkoxycarbonyl, amino, dimethylamino, nitro or by cyano. Meanings corresponding to those given hereinbefore can also be ascribed to the substituents in composite definitions, such as, for example alkylamino-alkyl, dialkylamino-alkyl, cycloalkyl-alkyi, alkenyloxy-alkyl, alkynyloxy-alkyl, alkylsulfoxy-alkyl, alkylsulfonyl-alkyl, alkylcarbonyl-alkyl, alkoxycarbonyl-alkyl, alkylaminocarbonyl-alkyl, dialkylaminocarbonyl- alkyl, alkylcarbonylamlno-alkyl, alkylcarbonyl(alkyl)-amlno-alkyl, phenyl-alkyi and heteroaryl-alkyl. Compounds of formula I wherein an alkylene ring may be fused or spiro-bound to the group Z2, which alkylene ring, together with the carbon atoms of the group Z2, contains from 2 to 6 carbon atoms, have, for example, the following structure N ^ // \}\ ? (spiro-linked) or R, O G ^Q (fused). R, O Compounds of formula I wherein in the group Z2 an alkylene ring bridges at least one ring atom of the group Z2 have, for example, the following structure KC Ri 9. (bridged). R3 O^ G In the definitions for cyanoalkyi, alkylcarbonyl, alkylcarbonylamino and alkoxycarbonyl, the carbon atom of the cyano or carbonyl is not included in the lower and upper limits given for the number of carbons in each particular case. The compounds of formula I, except for those derivatives wherein G is -CH2-X6-R37, are known from WO 99/47525 and can be prepared analogously to the methods described therein and in EP-A-0 508 126. The compounds of formula lla are known from DE-A-3 939 503, those of formula lib from DE-A-4 331 448, those of formula lie from WO 99/16744, those of formula lid from WO 00/30447 and those of formula lie from WO 00/00020. The compounds of formula la O f?i (la). CHg-Xg-Rg^ wherein Ri, R3, R4, R5, R37 and Xe are as defined for formula I, are new and are therefore also included in the present invention. The compounds of formula la can be prepared using processes known perse, for example by converting a compound of formula lb O ^1 \\ // (lb), in an inert solvent, for example an aromatic hydrocarbon, e.g. benzene, toluene or a xylene; a chlorinated hydrocarbon, e.g. dichloromethane or chlorobenzene; a ketone, e.g. acetone or 2-butanone; a nitrile, e.g. acetonitrile or propionitrile; an ether, e.g. diethyl ether, tert-butylmethyl ether or di-n-propyl ether; an ester, e.g. ethyl acetate; an amide, e.g. N,N-dimethylformamide or N-methylpyrrolidone (NMP); a sulfoxide, e.g. dimethyl sulfoxide (DMSO) or a sulfone, e.g. sulfolane, in the presence of a base, for example an alkylamine, e.g. triethylamine or dilsopropylethylamine; an alicyclic or aromatic amine, e.g. 1,4-diazabicyclo[2.2.2]octane (DABCO) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or pyridine; a cariDonate, e.g. sodium or potassium carbonate, or sodium or potassium bicarbonate, into the corresponding salt of fonnula Ic °% R3 (Ic), wherein the radicals Ri, R3, R4 and R5 in the compounds of formulae lb and Ic are as defined for formula I and Go is an alkali metal, alkaline earth metal, ammonium or sulfonium cation, depending on the base used, and then reacting the compound of formula Ic with a compound of formula III R37-X6-CH2-Y (III), wherein R37 and Xg are as defined for formula I and Y is a leaving group, for example halogen, e.g. chlorine, bromine or iodine, at temperatures of from -20°C to reflux temperature, preferably at from 0°C to the reflux temperature of the solvent used. The Example that follows illustrates the preparation of compounds of formula la. Example P1: Preparation of \\ // C2H5 CA C(CH3)3 0.753 g of pivalic acid chloromethyl ester is added to 0.75 g of sodium iodide dissolved in 20 ml of acetone, and the reaction mixture is stirred overnight at 25'C. The reaction mixture is cooled to 5°C; 1.58 g of 8-(2,6-diethyl-4-methylphenyl)tetrahydropyrazolo[1,2-d][1,4,5]-oxadiazepine-7,9-dione and 0.69 g of potassium carbonate are added and the reaction mixture is stirred first for one hour at 5°C and then for 24 hours at 25°C. The resulting reaction mixture is filtered and the filtrate is concentrated by evaporation under reduced pressure. The residue is dissolved in 100 ml of ethyl acetate, washed with water until neutral, dried over sodium sulfate and concentrated by evaporation. The preferred compounds of formula la listed in Table 1 below are prepared in an analogous manner. Table 1: Compounds of formula la O "i (la) Comp. No. Ri R3 -X6-R37 Phys. data 1.001 -C2H5 -C2H5 -0-C(0)C(CH3)3 'H-NMR (300 MHz, CDCI3): 6.90 ppm (s, 2H); 5.20 ppm(s,2H); 4.10 ppm (m, 2H); 3.85 ppm (m, 2H); 3.80 ppm (s, 4H); 2.80 ppm (s, 3H); 2.50 ppm (m, 4H); 1.15 ppm (t, 6H); 1.15 ppm (s,9H). 1.002 -C2H5 -C2H5 -S-CH3 1.003 -C2H5 -C2H5 -O-CH3 1.004 -C2H5 -CECH -O-CH3 1.005 -C2H5 -OCH3 -O-CH3 1.006 -C2H5 -C2H5 -O-C2H5 1.007 -C2H5 -C2H5 -0-(CH2)2-0-CH3 1.008 -C2H5 -CECH -O-C2H5 1.009 -C2H5 -C2H5 -S-CH3 1.010 -C2H5 -C2H5 -0-C(0)-C(CH3)3 Herbicides of formula I that are preferred for the composition according to the invention are those wherein Rt and R3 are, each independently of the other, ethyl, haloethyl. ethynyl, Cr or C2-alkoxy or Ci- or C2-haloalkoxy. In a further group of preferred compounds of formula I, R4 and R5 together form a group Z2 -CRi4(Ri5)-CRi6(Ri7)"0-CRie(Ri9)-CR2o(R2i)- (Z2), wherein Ru, R15, Rie, R17, Ris, R19. R20 and R21 are hydrogen. Preference is given also to those compounds of formula I wherein G is hydrogen, -C(Xi)-R30, -C(X2)-X3-R3i. ■C(X4)-NR32(R33), -S(0)2-R34. -P(X5)R35R36, -CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4 , X5 and Xe are, each independently of the others, oxygen or sulfur; R30, R31, R32, R33. R34, R35, R36 and R37 are, each independently of the others, hydrogen, CrCaalkyI, CrCshaloalkyI, Ci-Cacyanoalkyl, Ci-CanitroalkyI, Ci-CsaminoalkyI, C2-C5alkenyl, Ca-Cshaloalkenyl, Ca-Cscycloalkyi, CrCsalkyl-amino-CrCaalkyI, di(CrC5alkyl)amino-CrC2alkyl, C3-C7cycloaIkyl-CrC2alkyl, CrC4alkoxy-Ci-C4alkyl, C2-C4alkenyloxy-CrC4alkyI, C3-C4alkynyloxy-Ci-C4alkyl, Ci-C4alkylthio-Cr C4alkyl, Ci-Caalkylsulfoxy-CrCaalkyl, Ci-C2alkylsuifonyl-Ci-C2alkyl, C2-C8alkylideneaminooxy-CrC2alkyl, CrCsalkylcarbonyl-Ci-CaalkyI, CrCsaikoxycarbonyl-d-C2alkyl, Ci-C5alkylaminocarbony!-CrC2alkyl, di(CrC4alkyl)aminocarbonyl-Ci-C2alkyl, Cr C5alkylcarbonylamino-CrC2alkyl, Ci-C2alkylcarbonyl-(CrC3alkyl)-amino-Ci-C2alkyl. tri(Cr or C2-alkyl)silyl-CrC3alkyl, phenyl, heteroaryl, phenyl-CrC2alkyl, heteroaryl-CrC2alkyl, phenoxy-CrC2alkyl or heteroaryloxy-CrC2alkyl; R34, R35 and R36 are, in addition, Cr Cealkoxy, CrCehaloaikoxy, Ci-C3alkylamino, di(CrC3alkyl)amino. benzyloxy or phenoxy, wherein the aromatic rings of the last two substituents may be substituted by halogen, nitro, cyano, amino, dimethylamino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csalkoxycarbonyl or by Cr or C2-haloalkyl; and R37 is, in addition, CrCealkylcarbonyl. Among those, special preference is given to those compounds wherein G is hydrogen, ■C(Xi)-R3o. -C(X2)-X3-R3i. -C(X4)-NR32(R33). -S(0)2-R34, -P(X5)R35R36. -CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4 , X5 and Xe are, each independently of the others, oxygen or sulfur; R30, R31, Rssi R33. R34. R35, R36 and R37 are, each independently of the others, hydrogen, Ci-CsalkyI, d-Cshaloalkyl, C2-C5alkenyl, C2-C5haloalkenyl, Cs-Cscycloaikyl, C3'C7cycloalkyl-CrC2alkyl, CrC4alkoxy-Ci-C4alkyl, phenyl, heteroaryl. phenyl-Ci-C2alkyl, heteroaryl-Ci-C2alkyl, phenoxy-Ci-CaalkyI or heteroaryloxy-CrC2alkyl; R34. R35 and R36 are, in addition, Ci-Cealkoxy, Ci-Caalkylamino or di(CrC3alkyl)amino; and R37 is, in addition, Ci-CsalkylcarbonyL Preference is also given to those compounds of formula I wherein G is -CH2-X6-R37 and Xe and R37 are as defined for formula I. Preference is likewise given to compounds of formula I wherein Ri or R3 is, or Ri and R3 are, each independently of the other d- or Ca-haloalkoxy or d- or C2-hydroxyalkyl. Preference is also given to compounds of formula I wherein G is •C(Xi)-R3o, "C(X2)-X3'R3i, -C(X4)-NR32(R33), 'S(0)2-R34 Or-P(X5)R35R36; Xi, X2, X3, X4 and X5 are, each independently of the others, oxygen or sulfur; R30. R3i» R32, R33. R34. R35 and R36 are, each independently of the others, d-docyanoalkyl, Ci-Cionitroalkyl, Ci-Cioaminoalkyl, d-Csalkylamino-CrCsalkyl, di(CrC5alkyl)amino-CrC5-alkyl, Ca-Cycycloalkyl-Ci-Csalkyl, Cs-Csalkenyloxy-d-CsalkyI, Cs-Csalkynyloxy-d-Csalkyl, Ci-Csalkylthio-d-CsalkyI, CrCsalkylsulfoxy-Ci-CsalkyI, d-Csalkylsulfonyl-d-Csalkyl, Ca-Cs-alkylideneaminooxy-Ct-Csalkyl, CrCsalkylcarbonyl-d-Csalkyl, Ci-Csalkoxycarbonyl-CrCs-alkyl, Ci-Csalkylaminocarbonyl-CrCsalkyl, di(CrC5alkyl)aminocarbonyl-d-C5alkyl, C1-C5-alkylcarbonylamino-Ci-Csalkyi, CrC5alkylcarbonyl-(CrC5alkyl)-amino-CrC5alkyl, tri(Ci- or Ca-alkyOsilyl-CrCsalkyI, phenyl-CrCsalkyI, heteroaryl-d-Csalkyl, phenoxy-Ci-CsalkyI or heteroaryloxy-Ci-CsalkyI, wherein the afore-mentioned aromatic rings may be substituted by halogen, nitro, cyano, amino, di(Crdalkyl)amino. hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csalkoxycarbonyl or by Cr or Cg-haloalkyI; and R34, R35 and R36 are, in addition, Ci-Cioalkoxy, d-Ciohaloalkoxy, d-Csalkylamino, di(CrC5-alkyl)amino, benzyloxy or phenoxy, wherein the aromatic rings of the last two substituents may be substituted by halogen, nitro, cyano, amino, dimethylamino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csalkoxycarbonyl or by Ci- or C2-haloalkyl. Preferred selectively herbicidal compositions are those which comprise as active ingredient a mixture of a) a herbicidaliy effective amount of a herbicide of fomnula I, wherein Ri, R3. R4, R5 and G are as defined for formula I, and b) an amount, which is effective for antagonism of the herbicide, of a safener of formula lla, wherein R22 is as defined for formula lla, or of formula lib, wherein R23 is as defined for formula lib, or of formula lie, wherein R24 and R25 are, each independently of the other, hydrogen, CrCealkyI, Ca-Cealkenyl, C2-C6- alkynyl or Ca-CecycloalkyI; R26 is halogen. CrC4alkyl or Ci-C4haloalkyl; R27 is halogen, Ci-C4alkyl, CrC4haloalkyl, Ci-C4alkoxy, CrC4alkylthio, CrC4alkoxycarbonyl or nitro; n is 0, 1, 2 or 3; and m is 1 or 2. Safeners of formula lla preferred for the composition according to the invention are those wherein R22 is hydrogen or an alkali metal, alkaline earth metal, sulfonium or ammonium cation. Safeners of formulae lla and lib preferred for the composition according to the invention are those wherein R22 and R23 are ethyl and are referred to hereinafter as safeners of formulae llai and llbi (Biological Examples). They are known under the names mefenpyr-ethyl (compound no. llaO and isoxadifen-ethyl (compound no. llbi) (ISO proposed names). Safeners of formula lid preferred for the composition according to the invention are those wherein R28 is hydrogen, CrCealkyI, Cs-Cscycloalkyi or phenyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, hydroxy, carboxyl, formyl, carbonamide or by sulfonamide; R29 is hydrogen; R30 is hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, CrC4alkoxy, CrC4alkylthio, cyano, nitro or formyl; or the radicals R30 are, each independently of the other, hydrogen, halogen, CrC4alkyl, Cr C4haloalkyl, CrC4alkoxy, CrC4alkylthio, cyano, nitro orfomiyl; R31 is hydrogen; R32 is hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, CrC4alkoxy, CrC4alkylthlo, cyano, nitro or formyl; or the radicals R32 are, each independently of the other, hydrogen, halogen, Ci-C4alkyl, Ci-C4haloalkyl, CrC4a!koxy, CrC4a!kylthio, cyano, nitro or formyl; and o and p are, each independently of the other, 0,1 or 2. Safeners of formula lid that are especially preferred for the composition according to the invention are: 2-methoxy-N-[4-(2-methoxybenzoylsulfamoyl)phenyl]acetamide; N-[4-(2-methoxybenzoylsulfamoyl)phenyl]cyclopropanecarboxamide; N-[4-(2-methoxybenzoylsulfamoyl)phenyl]cyclobutanecarboxamide; N-[4-(2-chlorobenzoylsulfamoyl)phenyl]cyclopropanecarboxamide; N-[4-(2-chlorobenzoylsulfamoyl)phenyl]acetamide; N-[4-(2-trifluoromethoxybenzoylsulfamoyl)phenyl]acetamide; N-[4-(2-trifluoromethylbenzoylsulfamoyl)phenyl]cyclopropanecarboxamide; N-[4-(2-trifluoromethoxybenzoylsulfamoyl)phenyl]cyclopropanecarboxamide; N-[4-(2-trifluoromethoxybenzoylsulfamoyl)phenyl]cyclobutanecarboxamide; and N-[4"(2-trifluoromethylbenzoylsulfamoyl)phenyl]acetamide. Safeners of formula lie preferred for the composition according to the invention are those wherein G2 is hydrogen, formyl, Ci-Cealkylcarbonyl, Ca-Cealkenylcarbonyl, Ca-Cealkynyl-carbonyl, CrCeaikoxycarbonyl, (Ci-C6alkylthio)carbonyl, Ca-Cacycloalkylcarbonyl, phenyl-CrCealkylcarbonyl or phenylcarbonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R33 is hydrogen, d-Cealkyl, Ca-Csalkenyl, C2-C6alkynyl, formyl, CrCealkylcarbonyl or CrCealkoxy-carbonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R34 is hydrogen, CrCealkyI, C2-C6alkenyl, C2-C6alkynyl, formyl, CrCealkylcarbonyl orCrCe-alkoxycarbonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R35. R36, R37 and R38 are, each independently of the others, hydrogen, halogen, cyano, nitro, formyl, carboxyl, CrCealkoxy, CrCehaloalkoxy, CrCealkylcarbonyl, CrCeaikoxycarbonyl, CrCealkyI or CrCehaloalkyI; or R38 and R33, together with the ring atoms to which they are bonded, form a five- or six-membered saturated or unsaturated ring that contains up to 2 identical or different hetero atoms selected from the group oxygen, sulfur and nitrogen and that may be interaipted by a -C(0)- radical. Among those, special preference is given to those compounds wherein Gg is hydrogen, formyl, d-Cealkylcarbonyl, C2-C6alkenylcarbonyl, C2-C6alkynylcarbonyl, Cr Cealkoxycarbonyl, (CrC6alkylthio)carbonyl, Ca-Cecycloalkyicarbonyl or phenylcarbonyl; R33 is hydrogen, Ci-CealkyI, C2-C6alkenyl, C2-C6alkynyl, formyl, CrCealkylcarbonyl or Cr Cealkoxycarbonyl; R34 is hydrogen. Ci-CealkyI, C2-C6alkenyl, C2-C6alkynyl, formyl, Ci-Cealkylcarbonyl or Ci-Ce- alkoxycarbonyl; R35, R36. R37 and R38 are, each independently of the others, hydrogen, halogen, cyano, nitro, formyl, Ci-CealkyI, Ci-CehaloalkyI, CrCealkoxy or Ci-Cehaloalkoxy; or R38 and R33, together with the ring atoms to which they are bonded, fomi a five- or six-membered saturated or unsaturated ring that contains up to 2 identical or different hetero atoms selected from the group oxygen, sulfur and nitrogen and that may be interrupted by a -C(0)- radical. Safeners of formula lie that are especially preferred for the composition according to the invention are: 4-hydroxy-1 -methyl-3-(1 H-tetrazole-5-carbonyl)-1 H-quinolin-2-one; 1 -ethyl-4-hydroxy-3-(1 H-tetrazole-5-carbonyl)-1 H-quinolin-2-one; 6-hydroxy-5-(1H-tetrazole-5-carbonyl)-1,2-dihydro-pyrrolo[3,2,1-H]quinolin-4-one; 3-(1 -acetyl-1 H-tetrazole-5-carbonyl)-4-hydroxy-1 -methyM H-quinolin-2-one; 6-chloro-4-hydroxy-1 -methyl-3-(1 H-tetrazole-5-carbonyl)-1 H-quinolin-2-one; 6-fluoro-4-hydroxy-1 -methyl-3"(1 H-tetrazole-5-carbonyl)-1 H-quinolin-2-one; 4-hydroxy-1,6-dimethyl-3-(1 H-tetrazole-6-carbonyl)-1 H-quinolin-2-one; 4-hydroxy-6-methoxy-1 -methyl-3-(1 H-tetrazole-5-carbonyl)-1 H-quinolin-2-one; 1 ■methyl-2-oxo-3-(1 H-tetrazole-5-carbonyl)-1,2-dihydroquinolin"4-yl acetate; and 1 -methyl-2-oxo-3-(1 H"tetrazole-5-carbonyl)-1,2-dihydroquinolin-4-yl 2,2-dimethyl-propionate. The invention relates also to a method for the selective control of weeds in crops of useful plants, which method comprises treating the useful plants, their seeds or seedlings or the crop area thereof with, simultaneously or separately, a) a herbicidally effective amount of a herbicide of formula I, b) an amount, which is effective for antagonism of the herbicide, of a safener of formula II and, optionally, c) an aoditive comprising an oil of vegetable origin or an alkylated derivative thereof, or a mineral oil or a mixture thereof. Cultivated plants that may be protected against the harmful effect of the above-mentioned herbicides by means of the safeners of formula II are especially cereals, maize and sorghum. Crops are to be understood as including those that have been made tolerant to herbicides or classes of herbicides by means of conventional breeding or genetic engineering methods, for example IMI Maize, Poast Protected Maize (Sethoxydim tolerance), Liberty Link Maize, B.tAiberty Link Maize, IMI/Liberty Link Maize, IMI/Liberty Link /B.t. Maize, Roundup Ready Maize and Roundup Ready/B.L Maize. The weeds to be controlled may be both monocots and dicots, for example Stellaria, Nasturtium, Agrostis, Digitaria, Avena, Setaria, Sinapis, Lolium, Solanum, Echinochloa, Scirpus, Monochoria, Sagittaria, Bromus, Alopecurus, Sorghum halepense, Rottboellia, Cyperus, Abutilon, Sida, Xanthium, Amaranthus, Chenopodium, Ipomoea, Chrysanthemum, Galium, Viola and Veronica. Crop areas are areas of land on which the cultivated plants are already growing or in which the seeds of those cultivated plants have been sown, and also areas of land on which it is intended to grow those cultivated plants. A safener of formula II may, depending on the intended purpose, be used to pre-treat the seed material of the cultivated plant (dressing the seed or the seedlings) or may be incorporated into the soil before or after sowing. It may, however, also be applied, alone or together with the herbicide and, optionally, the oil additive, after the emergence of the plants. The treatment of the plants or seed with the safener can therefore, in principle, be effected independently of the time at which the heriDi'cide is applied. The treatment of the plant can, however, also be carried out by applying the herbicide and the safener simultaneously (for example in the form of a tank mixture). The rate of application of the safener In relation to the herbicide depends largely on the method of application. In the case of field treatment, which is effected either using a tank mixture with a combination of the safener and the herbicide or by the separate application of the safener and the herbicide, the ratio of herbicide to safener is generally from 1:100 to 100:1, preferably from 1:10 to 10:1, and especially from 1:5 to 5:1. In the case of field treatment, from 0.001 to 5.0 kg safener/ha, preferably from 0.001 to 0.5 kg safener/ha. are generally applied. The rate of application of herbicide is generally from 0.001 to 2 kg/ha, but preferably from 0.005 to 0.5 kg/ha. In addition to the conventional formulation adjuvants, oil additives c) may be introduced as additives into the spray tank (as a tank mixture), besides surfactants and salts. In the composition according to the invention, the amounts of oil additive employed are generally from 0.01 to 2 % based on the spray mixture. The oil additive can, for example, be added to the spray tank in the desired concentration after the spray mixture has been prepared. Suitable oil additives include emulsifiable oil concentrates of mineral oils or, especially, of vegetable oils. Preferred vegetable oil concentrates comprise, for example, the following 4 components (A) from 20 to 90 % by weight of alkyl esters of higher fatty acids (C4-C22), (B) from 4 to 40 % by weight of anionic or non-ionic surfactants, (C) from 2 to 20 % by weight of higher fatty acids (C10-C20), and (D) up to 140 % by weight, based on the total amount of components (A) to (C), of hydrocarbons. Especially preferred oil additives c) comprise alkyl esters of higher fatty acids (C8-C22), especially the Ci-C4alkyl ester derivatives of C12-C18 fatty acids, for example the methyl esters of lauric acid, palmitic acid and oleic acid. Those esters are known as methyl laurate (CAS-111-82-0), methyl palmitate (CAS-112-39-0) and methyl oleate (CAS-112-62-9). The application and action of the oil additives can be improved by combining them with surface-active substances, for example anionic surfactants (B), Examples of suitable anionic surfactants are listed in WO 97/34485 on pages 7 and 8. Preferred surface-active substances are anionic surfactants of the dodecylbenzylsulfonate type, especially the calcium salts thereof. The concentration of the surface-active substances based on the total additive is generally from 1 to 30 % by weight. Preferred higher fatty acids (C) have from 12 to 18 carbon atoms. The addition of an organic solvent (D) to the oil additive/surfactant/fatty acid mixture can, furthemiore, bring about a further increase in action. Suitable solvents (D) are, for example, aromatic solvents, e.g. Solvesso® (ESSO) or Aromatic Solvent® (Exxon Corporation) types. The concentration of those solvents can be from 10 to 80 %, by weight, of the total weight. Such oil additives are described, for example, in US-A-4 834 908. They are especially preferred for the composition according to the invention. An especially preferred oil additive is known under the name MERGE®. The compositions according to the invention are suitable for all methods of application that are customary in agriculture, for example pre-emergence application, post-emergence application and seed dressing. In the case of seed dressing, from 0.001 to 10 g of safener/kg of seed, preferably from 0,05 to 2 g of safener/kg of seed, are generally applied. When the safener is applied in liquid form shortly before sowing, with swelling of the seed, safener solutions are advantageously used that comprise the active ingredient in a concentration of from 1 to 10 000 ppm, preferably from 100 to 1000 ppm. For application, the safeners of formula II or combinations of those safeners with the herbicides of formula I and, optionally the oil additives are advantageously processed, together with the adjuvants conventionally employed in formulation technology, into formulations, for example into emulsifiable concentrates, coatable pastes, directly sprayable or dilutable solutions, dilute emulsions, wettable powders, soluble powders, dusts, granules or microcapsules. Such formulations are described, for example, in WO 97/34485, on pages 9 to 13. The formulations are prepared in known manner, for example by intimately mixing and/or grinding the active ingredients with liquid or solid formulation adjuvants, for example solvents or solid carriers. Furthermore, surface-active compounds (surfactants) may also be used in preparation of the formulations. Solvents and solid carriers that are suitable for that purpose are mentioned, for example, in WO 97/34485 on page 6. Suitable surface-active compounds are, depending on the nature of the active ingredient of formula I being formulated, non-ionic, cationic and/or anionic surfactants and mixtures of surfactants having good emulsifying, dispersing and wetting properties. Examples of suitable anionic, non-ionic and cationic surfactants are listed, for example, in WO 97/34485 on pages 7 and 8. Furthermore, the surfactants customarily employed in formulation technology, which are described, inter alia, in "Mc Cutcheon's Detergents and Emulsifiers Annual" MC Publishing Corp., Ridgewood New Jersey, 1981, Stache, H., "Tensid-Taschenbuch", Carl Hanser Verlag, MunichA/ienna, 1981 and M. and J. Ash, "Encyclopedia of Surfactants", Vol l-lll, Chemical Publishing Co., New York, 1980-81, are also suitable for preparation of the herbicidal compositions according to the invention. The herbicidal formulations generally comprise from 0.1 to 99 % by weight, especially from 0.1 to 95 % by weight, of active ingredient mixture comprising a compound of formula I together with a compound of formula II, from 0.01 to 2 % by weight of oil additive, from 1 to 99.9 % by weight of a solid or liquid formulation adjuvant and from 0 to 25 % by weight, especially from 0.1 to 25 % by weight, of a surfactant. Whereas commercial products will preferably be formulated as concentrates, the end user will normally employ dilute formulations. The compositions may also comprise further ingredients such as stabilisers, for example vegetable oils or epoxidised vegetable oils (epoxidised coconut oil, rapeseed oil or soybean oil), antifoams, for example silicone oil, preservatives, viscosity regulators, binders and tackifiers, as well as fertilisers or other active ingredients. There are various suitable methods and techniques for using the safeners of formula II or compositions comprising them for protecting cultivated plants against the harmful effects of herbicides of formula I; the following are examples: i) Seed dressing a) Dressing the seeds with a wettable powder formulation of a compound of fomiula II by shaking in a vessel until the fonnulation is uniformly distributed over the seed surface (dry dressing). Approximately from 1 to 500 g of compound of formula II (from 4 g to 2 kg of wettable powder) are used per 100 kg of seed. b) Dressing the seeds with an emulsifiable concentrate of a compound of formula II according to method a) (wet dressing). c) Dressing by immersing the seed in a liquid formulation comprising from 100 to 1000 ppm of a compound of formula II for from 1 to 72 hours and, if desired, subsequently drying the seeds (immersion dressing). Dressing the seed or treating the gemiinated seedlings are naturally the preferred methods of application because the treatment with the active ingredient is directed wholly at the target crop. Generally from 1 to 1000 g of antidote, preferably from 5 to 250 g of antidote, are used per 100 kg of seed, although, depending on the method employed, which also allows the addition of other active ingredients or micronutrients, amounts that exceed or fall short of the specified concentration limits may be employed (repeat dressing). ii) Application in the form of a tank mixture A liquid formulation of a mixture of antidote and herbicide (ratio of the one to the other from 10:1 to 1:100) is used, the rate of application of herbicide being from 0.005 to 5.0 kg per hectare. Such a tank mixture is applied before or after sowing. iii) Application in the seed furrow The compound of formula II is introduced into the open, sown seed furrow in the form of an emulsifiable concentrate, a wettable powder or granules and, after the seed furrow has been covered, the herbicide is applied pre-emergence in the normal manner. iv) Controlled release of the active ingredient The compound of formula II is applied in solution to granulated mineral carriers or polymerised granules (urea-formaldehyde) and dried. If desired, a coating may be applied (coated granules) which enables the active ingredient to be released in metered amounts over a predetemiined period of time. Preferred formulations have especially the following composition (% = percent by weight; 'active ingredient mixture' denotes the mixture of the compound of formula I with the compound of formula II) Emulsifiable concentrates: active ingredient mixture: 1 to 90 %, preferably 5 to 20 % surface-active agent: 1 to 30 %, preferably 10 to 20 % liquid carrier: 5 to 94 %, preferably 70 to 85 % Dusts: active ingredient mixture: 0.1 to 10 %, preferably 0.1 to 5 % solid carrier: 99.9 to 90 %, preferably 99.9 to 99 % Suspension concentrates: active ingredient mixture: 5 to 75 %, preferably 10 to 50 % water: 94 to 24 %, preferably 88 to 30 % surface-active agent: 1 to 40 %, preferably 2 to 30 % Wettable powders: active ingredient mixture: 0.5 to 90 %, preferably 1 to 80 % surface-active agent: 0.5 to 20 %, preferably 1 to 15 % solid carrier: 5 to 95 %, preferably 15 to 90 % Granules: active ingredient mixture: 0.1 to 30 %, preferably 0.1 to 15 % solid carrier: 99.5 to 70 %, preferably 97 to 85 % The Examples that follow illustrate the invention further. They do not limit the invention. Formulation Examples for mixtures of herbicides of formula I and safeners of formula II 1% = percent by weight) b) c) d) 10% 25% 50% 8% 6% 8% - 4% 4% F1. Emulsifiable concentrates a) active ingredient mixture 5 % calcium dodecylbenzenesulfonate 6 % castor oil polyethylene glycol ether 4 % (36 mol of ethylene oxide) octylphenoxypolyethylene glycol ether •• 4 % - 2 % (7-8 mol of ethylene oxide) cyclohexanone - - 10 % 20 % aromatic C9-Ci2hydrocarbon mixture 85 % 78 % 55 % 16 % Emulsions of any desired concentration can be prepared from such concentrates by dilution with water. b) c) d) 10% 50% 90% 20% 20% - 10% . - F2, Solutions a) active ingredient mixture 5 % 1 -methoxy-3-(3-methoxy- propoxy)-propane polyethylene glycol (mol. wt. 400) 20 % N-methyl-2-pyrrolidone - - 30 % 10 % aromatic Cg-Cizhydrocarbon mixture 75 % 60 % The solutions are suitable for application in the form of micro-drops. F3. Wettable powders a) b) c) d) active ingredient mixture 5% 25% 50% 80% sodium jignosulfonate 4% - 3% - sodium lauryl sulfate 2% 3% - 4% sodium diisobutylnaphthalenesulfonate - 6 % 5% 6% octylphenoxypolyethylene glycol ether - 1 % 2% - (7-8 mol of ethylene oxide) highly dispersed silicic acid 1 % 3% 5% 10% kaolin 88% 62% 35% . The active ingredient is mixed with the adjuvants and the mixture is thoroughly ground in a suitable mill, affording wettable powders which can be diluted with water to give suspensions of any desired concentration. b) c) 5% 15% 2% 2% 93% 83% F4. Coated granules a) active ingredient mixture 0.1 % highly dispersed silicic acid 0.9 % inorganic carrier material 99.0 % (/E 0.1 -1 mm) for example CaCOa or SiOg The active ingredient is dissolved in methylene chloride, the solution is sprayed onto the carrier, and the solvent is subsequently evaporated off in vacuo. a) b) c) 0.1 % 5% 15% 1.0 % 2% 3% 0.9 % 1 % 2% 98.0 % 92% 80% F5, Coated granules active ingredient mixture polyethylene glycol (mol. wt. 200) highly dispersed silicic acid inorganic carrier material (/E0.1 -1 mm) for example CaCOa or SiOa The finely ground active ingredient is uniformly applied, in a mixer, to the carrier material moistened with polyethylene glycol, yielding non-dusty coated granules. F6. Extruder Granules a) b) c) d) active ingredient mixture 0.1 % 3% 5% 15% sodium lignosulfonate 1.5 % 2% 3% 4% carboxymethylcellulose 1.4 % 2% 2% 2% kaolin 97.0 % 93% 90% 79% The active ingredient is mixed with the adjuvants, and the mixture is ground, moistened with water, extruded and then dried in a stream of air. b) c) 1 % 5% 49% 35% 50% 60% F7. Dusts a) active ingredient mixture 0.1 % talcum 39.9 % kaolin 60.0 % Ready-to-use dusts are obtained by mixing the active ingredient with the carriers and grinding the mixture in a suitable mill. b) c) d) 10% 25% 50% 5% 5% 5% 1 % 2% - 3% 4% 5% 1 % 1 % 1 % 0.2 % 0.2 % 0.2 % 0.8 % 0.8 % 0.8 % 79% 62% 38% F8. Suspension concentrates a) active Ingredient mixture 3 % ethylene glycol 5 % nonylphenoxypolyethylene glycol ether (15 mol of ethylene oxide) sodium lignosulfonate 3 % carboxymethylcellulose 1 % 37 % aqueous formaldehyde solution 0.2 % silicone oil emulsion 0.8 % water 87 % The finely ground active ingredient is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired concentration can be obtained by dilution with water. It is often more practical to formulate the active Ingredient of formula I and the mixing partner of formula II separately and then, shortly before application, to bring them together in the applicator in the desired mixing ratio in the form of a "tank mixture" in water. The ability of the safeners of formula II to protect cultivated plants from the phytotoxic action of herbicides of formula I is illustrated in the following Examples. Biological Examples Examples B1, B2 and B3: Post-emergence applications of mixtures of a herbicide of formula I, wherein Ri and R3 are -C2H5; R4 and R5 together form a group Z2 -CRi4{Ri5)-CRi6(Ri7)-0-CRi8(Ri9)-CR2o(R2i)- (Z2), wherein R,4. R15, Rie, R17, R18, R19, R2oand R21 are hydrogen; and G Is either hydrogen (= herbicide no. I,) or (CH3)3CC(0)- (= herbicide no. I2), with a safener of formula lla, wherein R22 is ethyl (= safener no. Ilai), or of formula lib, wherein R23 is ethyl (= safener no. Ilbi), to wheat and barley, together with 3 different weeds. The test plants are grown in pots under greenhouse conditions until a post-application stage, A standard soil is used as the cultivation substrate. At a post-emergence stage, the herbicides, both alone and in admixture with safeners, are applied to the test plants or to cultivated plants of which the seeds were dressed with safeners. Application is carried out using an emulsion prepared from a 25 % emulsifiable concentrate (Example F1, b)) of the test substances using 500 I of water/ha. The rates of application are matched to the optimum dosages determined under field or greenhouse conditions. Evaluation of the tests is carried out after 9, 10, 20 and 24 days (100 % action = complete destruction; 0 % action = no phytotoxic action). The results obtained show that the safener used can significantly reduce the damage caused to the cultivated plants by the herbicide of formula I. Examples of the action of the composition according to the invention are given in Tables B1,B2andB3. Table B1: Post-emergence application of herbicide no li, alone and in combination with safener no. Ilai, to summer wheat, hard wheat and Lolium rigidum; evaluation 9 and 20 days after application. Plant Evaluation [days] Herbicide no. li [a.i. g/ha] 500 Herbicide no. 1, [a.i. g/ha] 250 + safener no. Ilai 125 / [a.i. g/ha] 250 125 60 125 60 30 summer wheat 9 60 60 60 20 10 10 hard wheat 9 60 60 55 10 5 5 summer wheat 20 50 40 20 15 5 0 hard wheat 20 45 30 20 10 0 0 Lolium rigidum 20 100 100 95 100 95 95 Table B2: Post-emergence application of herbicide no, li at concentrations of 125, 60, 30 and 15 g a.i./ha, alone and in combination with safener no. Ilai and llbi at 30, 15, 8 and 4 g a.i./ha, to winter wheat and winter barley, and also Agrostis spica-venti, Alopecurus myosuroides and Lolium rigidum; evaluation 10 days after application. Plant Herbicide no. li [a.i. g/ha] Herbicide no. h [a.i. g/ha] Herbicide no. li [a.i. g/ha] 125 60 30 + safener no. Ilai [a.i. g/ha] 15 125 60 30 + safener no. llbi [a.i. g/ha] 15 125 60 30 15 30 15 8 4 30 15 8 4 winter wheat 20 10 5 0 0 0 0 0 10 5 0 0 winter barley 0 0 0 0 0 0 0 0 0 0 0 0 Agrostis sp. 80 80 70 70 80 80 70 60 80 80 70 70 AlopecuRJs m. 90 80 80 50 90 90 80 60 90 80 80 70 Lolium r. 80 60 60 60 80 80 70 60 80 80 70 60 Table B3: Post-emergence application of herbicide no. I2 at concentrations of 125, 60, 30 and 15 g a.i./ha, alone and in combination with safener no. Jlsi and llbi at 30,15, 8 and 4 g a.i./ha, to winter wheat and winter barley, and also Agrostis spica-venti, Alopecurus What is claimed is: 1. A selectively herbicidal composition which, in addition to customary inert formulation assistants, comprises as active ingredient a mixture of a) a herbicidally effective amount of a compound of formula I wherein Ri and R3 are, each independently of the other, ethyl, haloethyl, ethynyl, Cr or Cg-aikoxy, Cr or C2-haloalkoxy, Cr or C2-alkylcarbonyl or Cr or C2-hydroxyalkyl; R4 and R5 together are a group Z2 -CRi4(Ri5)-CRi6(Ri7)-0-CRi8(Ri9)-CR2o(R2i)- (Z2); Ri4. Ri5. R16, Ri7, R18, Ri9» R20 and R21 are, each independently of the others, hydrogen, halogen, CrC4alkyl or Ci-C4haloalkyl, wherein an alkylene ring may be fused or splro-bound to the carbon atoms of the group Z2, which alkylene ring, together with the carbon atoms of the group Z2, to which it is bonded, contains from 2 to 6 carbon atoms and may be interrupted by oxygen, or the alkylene ring bridges at least one ring atom of the group Z2; G is hydrogen, -C(Xi)-R3o, -C(X2)-X3-R3i, "C(X4)-NR32(R33), -S(0)2-R34. -P(X5)R35R36. "CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4, X5 and Xe are, each independently of the others, oxygen or sulfur; Raoi R31, R32, R33, R34, Rssi R36 and R37 are, each independently of the others, hydrogen, Ci-CioalkyI, Ci-CiohaloalkyI, Ci-CiocyanoalkyI, CrCionitroalkyI, CrCioaminoalkyl, C2-C5-alkenyl. C2-C5haIoalkenyl, Cs-CscycloalkyI, Ci-Csalkylamino-Ci-CsalkyI, di(Ci-C5alkyl)amino-Ci-CsalkyI, C3-C7cycloalkyl-Ci-C5alkyl, CrCsalkoxy-Ci-CsalkyI, Ca-Csalkenyloxy-Ci-CsalkyI, C3-C5alkynyloxy-CrC5alkyl. CrCsalkylthio-Ci-CsalkyI, Ci-Csalkylsulfoxy-CrCsalkyI, d-Cs-alkylsuifonyl-Ci-Csalkyl, C2-C8alkylideneaminooxy-CrC5alkyI, Ci-Csalkylcarbonyl-Ct-Csalkyl, CrCsalkoxycariDonyl-CrCsaikyl, Ci-CsalkylaminocartDonyl-CrCsalkyI, di(CrC5alkyl)-aminocarbonyl-Ci-CsalkyJ, CrCsalkylcarbonylamino-d-Csalkyl, CrCsalkylcariionyKCrCs-alkyO-amino-Ci-Csaikyl, tri(Ci- or Ca-alkyOsilyi-CrCsaikyi, phenyl, heteroaryl, phenyl-Ci-Cs-alkyl, heteroaryl-Ci-CsalkyI, phenoxy-CrCsalkyI or heteroaryloxy-Ci-CsalkyJ, wherein the afore-mentioned aromatic rings may be substituted by halogen, nitro, cyano, amino, di(CrC4alkyl)amino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, CrCsaikoxycarbonyi or by Ci- or C2-ha!oalkyl; R34, R35 and R36 are, in addition, CrCioalkoxy, d-Ciohaloalkoxy, Ci-Csalkylamino, di(Ci-C5- alkyl)amino, benzyloxy or phenoxy, wherein the aromatic rings of the last two substituents may be substituted by halogen, nitro, cyano, amino, dimethylamino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, CrCsaikoxycarbonyi or by Cr or C2-haloalkyl; and R37 is, in addition, CrCioalkylcarbonyl, or a salt or diastereoisomer of a compound of formula I, and b) an amount, which is effective for antagonism of the herbicide, of a safener of formula lla wherein R22 is hydrogen, or an alkali metal, alkaline earth metal, sulfonium or ammonium cation, or ethyl, or of formula lib wherein R23 is hydrogen, or an alkali metal, alkaline earth metal, sulfonium or ammonium cation, or ethyl, wherein R24 and R25 are, each independently of the other, hydrogen, d-Cealkyl, Ca-Cealkenyl, C2-C6alkynyl or Ca-CecycloalkyI; R26 is hydrogen, halogen, CrC4alkyl, Ci-CehaloalkyI or Ci-Cehaloalkoxy; or the radicals R26 are, each independently of the other(s), hydrogen, halogen, Ci-C4alkyl, Ci-CehaloalkyI or Ci-Cehaloalkoxy; R27 is hydrogen, halogen, CrC4alkyl, CrC4haloalkyl, Ci-C4alkoxy, Ci-C4haloalkoxy, C1-C4- alkylthio, CrC4alkoxycarbonyl or nitro; or the radicals R27 are, each independently of the other, hydrogen, halogen, CrC4alkyl, Ci-C4haloalkyl, CrC4alkoxy, Ci-C4haloalkoxy, CrC4- alkylthio, CrC4alkoxycarbonyl or nitro; n is 0, 1, 2 or 3; and m is 1 or 2, or of formula lid wherein R28 is hydrogen, Ci-CealkyI, Ci-Cealkoxy, CrCealkylthio, Ca-CBcycloalkyI, phenyl, phenyl- CrCealkyl or heteroaryl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, hydroxy, carboxyl, formyl, carbonamide or by sulfonamide; R29 is hydrogen, d-Cealkyl or Ci-C4haloalkyl; R30 is hydrogen, halogen, CrC4alkyl, Ci-C4haloalkyl, Ci"C4alkoxy, Ci-C4alkylthio, CrC4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; or the radicals R30 are, each independently of the other, hydrogen, halogen, Ci-C4alkyl, CrC4haloalkyl, CrC4alkoxy, CrC4alkylthio, Ci-C4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; R31 is hydrogen, d-Cealkyl orCi-C4haloalkyl; R32 is hydrogen, halogen, CrC4alkyl, Ci-C4haloaikyl, Ci-C4alkoxy, Ci-C4alkylthio, CrC4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; or the radicals R32 are, each independently of the other, hydrogen, halogen, Ci-C4alkyl, Ci-C4haloalkyl, Ci-C4alkoxy, Ct-C4a!ky!thio, Ci-C4alkyl- sulfonyl, cyano, nitro, formyl or carboxyl; and o and p are, each independently of the other, 0, 1 or 2, or of formula lie wherein G2 is hydrogen, formyl, CrCealkylcarbonyl, Ce-Cealkenylcarbonyl, C2-C6alkynylcarbonyl, Ci-Cealkoxycarbonyl, (CrC6alkylthio)carbonyl, Cs-Cscycloalkylcarbonyl, phenyl-Ci-Cealkyl-carbonyl, phenylcarbonyl, CrCealkylsulfonyl, C2-C6alkenylsulfonyl or phenylsulfonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R33 is hydrogen, CrCealkyi, C2-C6alkenyl, Ca-Cealkynyl, Ca-Cacycioalkyl, formyl, CrCealkyl¬carbonyl, C2-C6alkenylcarbonyl, C2-C6alkynylcarbonyl, Ci-Cealkoxycarbonyl, (Ci-Cealkylthio)-carbonyl, Ca-Cecycioalkylcarbonyl, d-Cealkylsulfonyl, C2-C6alkenylsulfonyl or phenylsulfonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R34 is hydrogen, Ci-CealkyI, C2-Cealkenyl, C2-C6alkynyl, Ca-CscycloalkyI, formyl, CrCealkyl¬carbonyl, C2-C6alkenylcarbonyl, C2-Cealkynylcarbonyl, CrCealkoxycarbonyl, (CrCealkylthio)-carbonyl, Ca-Cscycloalkylcarbonyl, CrCealkylsulfonyl, C2-C6alkenylsulfonyl or phenylsulfonyl, wherein the afore-mentioned hydrocarbon radicals may be substituted by halogen, cyano, nitro, amino, methoxy, ethoxy or by phenyl; R35, R36» R37 and R38 are, each independently of the others, hydrogen, halogen, amino, Cr Caalkylamino, di(CrC3alkyl)amino, hydroxy, cyano, nitro, formyl, carboxyl, CrCeaJkoxy, d-Cehaloalkoxy, Ci-Cealkylcarbonyl, CrCealkoxycarbonyl, Ci-CealkyI, Ci-CehaloalkyI, Ca-Ce-alkenyl or C2-C6alkynyl; or R38 and R33, together with the ring atoms to which they are bonded, form a five- or six-membered saturated or unsaturated ring that contains up to 2 identical or different hetero atoms selected from the group oxygen, sulfur and nitrogen and that may be interrupted by a -C(0)- radical. 2. A composition according to claim 1, which comprises as active ingredient a mixture of a) a herbicidally effective amount of a herbicide of formula I, wherein Ri, R3, R4, R5 and G are as defined in claim 1, and b) an amount, which is effective for antagonism of the herbicide, of a safener of formula Ha, wherein R22 is as defined in claim 1 for formula lla, or of formula lib, wherein R23 is as defined in claim 1 for formula lib, or of formula lie. wherein R24 and R25 are, each independently of the other, hydrogen, Ci-CsalkyI, C2-C6alkenyl, C2-C6- akynyl or C3-C6cycloalkyl; R26 is halogen, CrC4alkyl or CrC4haloalkyl; R27 is halogen, Ci-C4alkyl, CrC4haloalkyl, CrC4alkoxy, CrC4alkylthio, CrC4alkoxycarbonyl or nitro; n is 0,1, 2 or 3; and m is 1 or 2. 3. A composition according to claim 1, wherein Ri and R3 in the compounds of formula I are, each independently of the other, ethyl, haloethyl, ethynyl, d- or C2-alkoxy or Ci- or C2-haloalkoxy. 4. A composition according to claim 1, wherein R4 and R5 in the compounds of fomiula I together form a group Z2 -CRi4(Ri5)-CRi6(Ri7)-0-CRi8(Ri9)-CR2o(R2i)- (Z2), wherein RM. Ri5. R16, Ri7. R18, Ri9i R20 and R21 are hydrogen. 5. A composition according to claim 1, wherein G in the compounds of formula I is hydrogen, -C(Xi).R3o, "C(X2)-X3-R3i, -C(X4)-NR32(R33), -S(0)2-R34. "P(X5)R35R36, "CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4, X5 and Xe are, each independently of the others, oxygen or sulfur; R30, R31, R32, R33, R34, R35, R36 and R37 are, each independently of the others, hydrogen, Ci-CealkyI, Ci-Cehaloalkyl, d-Cscyanoalkyl, Ci-CsnitroalkyI, CrCsaminoalkyI, C2-C5alkenyl, C2-C5haloalkenyl, C3-Cscycloalkyl, CrC5alkylamino-Ci-C2alkyl, di(Ci-C5alkyl)amino-Ci-C2alkyl, C3-C7cycloalkyl-Cr CaalkyI, Ci-C4alkoxy-CrC4alkyl, C2"C4alkenyloxy-Ci-C4alkyl, C3-C4alkynyloxy-Ci-C4alkyl, Ci-C4alkylthio-Ci-C4alkyl, CrC2alkylsulfoxy-Ci-C2alkyl, Ci-C2alkylsulfonyl-Ci-C2alkyl, C2-C8alkylideneaminooxy-CrC2alkyl, CrC5alkylcarbonyl-Ci-C2alkyl, CrCsalkoxycarbonyl-Ci-Czalkyl, Ci-C5alkylaminocarbonyl-CrC2alkyl, di(Ci-C4alkyl)aminocarbonyl-Ci-C2alkyl, d-Csalkylcarbonylamino-Ci-Caalkyl, Ci-C2alkylcarbonyl-(Ci-C3alkyl)-amino-Ci-C2alkyl, tri(Ci- or Cz-alkyOsilyl-CrCsaikyi, phenyl, heteroaryl, phenyl-CrC2alkyl, heteroaryl-Ci-C2alkyl, phenoxy-Ci-C2alkyl or heteroaryloxy-Ci-C2alkyl; R34, R35 and R36 are, in addition, d-Cgalkoxy, Ci-Cehaloalkoxy, CrCsalkyiamino, di(CrC3alkyl)amino, benzyloxy or phenoxy, wherein the aromatic rings of the last two substituents may be substituted by halogen, nitro, cyano, amino, dimethylamino, hydroxy, methoxy, ethoxy, methylthio, ethylthio, formyl, acetyl, propionyl, carboxyl, Ci-Csalkoxycarbonyl or by Ci- or C2-haloalkyl; and R37 is, in addition, Ci-Cealkylcarbonyl, 6. A composition according to claim 5, wherein G is hydrogen, "C(Xi)-R3o, -C(X2)-X3-R3i, -C(X4)-NR32(R33)i -S(0)2-R34. -P(X5)R35R36. -CH2-X6-R37 or an alkali metal, alkaline earth metal, sulfonium or ammonium cation; Xi, X2, X3, X4, X5 and Xe are, each independently of the others, oxygen or sulfur; R301 R31, R32. R33, R34, R35, R36 and R37 are, each independently of the others, hydrogen, Ci-CaalkyI, CrCshaloalkyJ, C2-C5alkenyl, C2-C5haloalkenyl, Cs-Cs-cycloalkyl, C3-C7cycloalkyl-Ci-C2alkyl, Ci-C4alkoxy-CrC4alkyl, phenyl, heteroaryl, phenyl-CrC2alkyl, heteroaryl-CrC2alkyl, phenoxy-Ci-C2alkyl or heteroary!oxy-Ci-C2alkyl; R34, R35 and R36 are, in addition, CrCealkoxy, Ci-Csalkylamino ordi(Ci-C3alkyl)amino; and R37 is, in addition, Ci-Csalkylcarbonyl. 7. A compound of formula la wherein Ri, R3, R4, R5, R37 and Xe are as defined in claim 1. 8. A method of selectively controlling weeds and grasses in crops of useful plants, which comprises treating the useful plants, their seeds or seedlings or the crop area thereof with, simultaneously or separately, a) a herbicidally effective amount of a herbicide of formula I, b) an amount, which is effective for antagonism of the herbicide, of a safener of formula II and, optionally, c) an additive comprising an oil of vegetable origin or an alkylated derivative thereof, or a mineral oil or a mixture thereof. 9. A method according to claim 8, which comprises treating crops of useful plants or crop areas for crops of useful plants with from 0.001 to 2 kg/ha of a herbicide of formula I and an amount of from 0.001 to 0.5 kg/ha of a safener of formula II. 10. A method according to claim 8, wherein the crops of useful plants are cereals, maize and sorghum. 11. A composition according to claim 1, which also comprises, in addition to the formulation adjuvants, an oil additive in the form of a vegetable oil concentrate consisting of the 4 components (A) from 20 to 90 % by weight of an alkyl ester of a higher fatty acid (C4-C22), (B) from 4 to 40 % by weight of an anionic surfactant, (C) from 2 to 20 % by weight of a higher fatty acid (C10-C20), and (D) up to 140 % by weight, based on the total amount of ^ components (A) to (C), of a hydrocarbon. 12. A composition according to claim 11, wherein (A) is a CrC4alkyl ester of a C12-C18 fatty acid, (B) is an anionic surfactant of the dodecylbenzylsulfonate type, (C) is a C12-C18 fatty acid, and (D) is an aromatic hydrocarbon. 13. A selectively herbicidal composition substantially as hereinbefore described. 14. A method of selectively controlling weeds and grasses substantially as heieinbefore described.

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