Title of Invention

A METHOD OF PRODUCING A 2, 6 DICHLOROPHENOL COMPOUND

Abstract

A METHOD OF PRODUCING A 2, 6 DICHLOROPHENCL COMPOUND A 2,6-dichlorophenol compound of formula (l)' wherein R represents a 3,3-dihalo-2-propenyl group or a benzyl group optionally substituted by halogen atom(s), can be produced by making a phenol compound of formula (2): wherein R has the same meaning mentioned above, react with sulfuryl chloride in the presence of a secondary amine in high yield. The obtained 2,6-dichlorophenol compound of formula (l) is useful as intermediate for producing dihalopropene compounds having insecticidal/ acaricidal activity.

Full Text

Field of the Invention The present invention relates to method of producing 2,6- dichlorophenol compound. Background Arts It is described that a kind of 2,6-dichlorophenol compounds are useful for intermediates to prepare dihalopropene compounds having insecticidal/acaricidal activity in 963/MAS/95 and 1293/MAS/95. According to the descriptions, said 2,6-dichlorophenol compounds can be given by making a phenol compound react with t-butyl hypochlorite. (963/MAS/95 and 1293/MAS/95) However, this preparation method does not give high yield, and so it is not sufficient to prepare the objected 2,6-dichlorophenol compounds. On the other hand, the 2,6-dichlorination of 4-alkylphenol with chlorine gas is described in JP-sh055-40613A and JP-sh052-27734A. Further, the chlorination of methoxyphenol is described in Chemosphere vol. 17, pp.1821-1829 (1988) and Ann. Kept Takeda Res. Lab. vol. 26, pp. 138-148 (1967). The object of the present invention is to provide a production method of the 2,6 dichlorophenol compounds useful for intermediates to prepare the dihalopropene compounds having insecticidal/acaricidal activity. Summary of the Invention The present invention provides a method for producing the 2,6-dichlorophenol compounds given by formula (1): wherein R has the same meaning mentioned above, : react with sulfuryl chloride in the presence of a secondary amine, and the method gives high yield of the product. Detailed Description of the Invention In the present invention, the 3,3-dihalo-2-propenyl group for R is exemplified by 3,3-dichloro-2-propenyl group and 3,3-dibromo-2-propenyl group. Further, the benzyl group optionally substituted by halogen atom(s) is exemplified by a benzyl group whose hydrogen atom(s) on its benzene ring may be substituted by at least one halogen atom, and the typical examples are benzyl group and 4-chlorobenzyl group. The present production method is characterized by the reaction of the phenol compound given by formula (2) with sulfuryl chloride in the presence of a secondary amine. The reaction is usually carried out in a solvent. Examples of the solvent used for the reaction include aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene, ethylbenzene and so on! aliphatic hydrocarbons such as hexane, heptane, octane and so on; halogenated aromatic hydrocarbons such as chlorobenzene, dichlorobenzene, benzotrifluoride and so on; and mixtures thereof. Examples of the secondary amine used for the reaction include dialkylamine such as di(C2-C6)alkylamine; dialkenylamines such as di(C3-C6)alkenylamine; alkylalkenylamines such as (C2-C6)alkyl(C3-C6) alkenylamine; and dicycloalkylamines such as di(C3-C6)cycloalkylamine. Typical dialkylamines are diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diisopropylamine, di-sec-.butylamine, ethylpropylamine and so on. Typical dialkenylamines are diallylamine allylpropylamine, di(3-butenyl)amine and so on. T5T)ical alkylalkenylamines are allylpropylamine and so on. Typical dicycloalkylamines are dicyclopropylamine, dicyclobutylamine, dicyclopentylamine, dicyclohexylalamine and so on The amount of the secondary amine used for the reaction is usually 0.001 to 1 mol based on 1 mol of the phenol compound given by formula (2), preferably 0.001 to 0.1 mol in the view of good operation for treatment after the reaction. The amount of the sulfuryl chloride used for the reaction is usually 1.5 to 3.0 mols, preferably 2.0 to 2.5 mols based on 1 mol of the phenol compound given by formula (2) in the view of good yield. The reaction temperature is usually in the range of 0 to 100°C, and the reaction period is usually in the range of 1 to 24 hours. The reaction can be, for example, carried out by the followings. 1) A method of dissolving the phenol compound given by formvila (2), the secondary amine and sulfuryl chloride in a solvent and stirring them. 2) A method of dissolving the phenol compound given by formula (2) and the secondary amine in a solvent and adding sulfuryl chloride dropwise to the solution under stirring. 3) A method of dissolving the secondary amine in a solvent, and adding the phenol compound given by formula (2) and sulfuryl chloride dropwise to the solution under stirring. The status of the reaction can be confirmed by analyzing the reaction mixture by analyzing means such as high performance Hquid chromatography, gas chromatography, thin layer chromatography and so on. After the reaction, the work"up procedures, for example, mentioned below can make the 2,6-dichlorophenol compound given by formula (l) isolated. 1) Pouring the reaction mixture into acidic water (e.g. hydrochloric acid, aqueous sulfuric acid), separating the organic solvent from water and concentrating the obtained organic layer. 2) Pouring the reaction mixture into week basic water (e.g. aqueous sodium ; hydrogencarbonate), separating the organic solvent from water and concentrating the obtained organic layer. 3) Adding an aqueous solution of a reducing agent (e.g. sodium sulfite, sodium hydrogensulfite, sodium thiosulfate) to the reaction mixture, stirring for 0.1 to 24 hours at 0 to 100°C, separating the organic solvent from water and concentrating the obtained organic layer. The isolated 2,6-dichlorophenol compound given by formula (l) can be further purified by column chromatography, recrystallization and so on. Then, 20g of 10% aqueous sodium sulfite solution was added to the reaction mixture and further stirred at 65 to 70°C for 1 hour. After allowing the reaction mixture to be cooled to room temperature, the organic layer was separated, washed with 5% hydrochloric acid, saturated brine and water subsequently, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 6.6g of crude 2,6-dichloro-4-(3,3-dichloro-2-propenyloxy)phenol given by formula (4)- The crude product was analyzed with liquid chromatography to show 96% of the content (yield: 96%). 2,6-dichloro-4"(3,3"dichloro"2-propenyloxy)phenol iR-NMR (CDCI3/TMS) 6 (ppm) : 4.57 (2H,d), 5.50 (IH, brs), 6.11 (lH,t), 6.85 (2H, s) Example 2 4.38g of 4-(3,3-dichloro-2-propenyloxy)phenol (purity: 100%) and 0.03g of diethylamine were dissolved in 26.3g of toluene, and 5.61g of sulfuryl chloride was added dropwise thereto over 3 hours under stirring at 65 to 70*C. After the addition, the mixture was stirred for one hour at 65 to 70°C. After allowing the reaction mixture to be cooled to room temperature, 20g of aqueous saturated sodium hydrogencarbonate solution was added to the reaction mixture. The organic layer was separated, washed with lOg of 5% hydrochloric acid and 10g of water subsequently, and concentrated under reduced pressure to give 5.76g of crude 2,6-dichloro-4-(3,3-dichloro-2"propenyloxy)phenol. The crude product was analyzed by liquid chromatography to show 95% of the content (yield: 95%). Example 3 4.38g of 4-(3,3-dichloro-2-propenyloxy)phenol (purity: 100%) and 0.04g of diisopropylamine were dissolved in 26.3g of toluene and 5.61g of sulfuryl chloride was added thereto dropwise over 3 hours at 65 to lOXl under stirring. After the addition, the mixture was stirred for one hour at 65 to 70 "C. After allowing the reaction mixture to be cooled to room temperature, 20g of aqueous saturated sodium hydrogencarbonate solution was added to the reaction mixture. The organic layer was separated, washed with lOg of 5% hydrochloric acid and lOg of water subsequently, and : concentrated under reduced pressure to give 5.76g of crude 2,6"dichloro'4-(3,3-dichloro-2-propenyloxy)phenol. The crude product was analyzed by liquid chromatography to show 96% of the content (yield: 96%). Example 4 Ten grams (lO.Og) of 4-benzyloxyphenol (purity: 100%) and 0.18g of dicyclohexylamine were dissolved in 43.25g of toluene and 13.48g of sulfuryl chloride was added dropwise thereto over 8 hours at 65 to 70°C under stirring. After the addition, the mixture was stirred for one hour at 65 to 70°C. Then, 50g of 10% aqueous sodium sulfite solution was added to the reaction mixture and further stirred at 65 to 70°C for 1 hour. The organic layer was washed with 5% hydrochloric acid, saturated brine and water subsequently, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 13.Ig of crude 2,6-dichloro-4-benzyloxyphenol given by formula (5): i The crude product was analyzed by liquid chromatography to show 96% of the content (yield- 94%). 2,6-dichloro-4-benzyloxyphenol 1H-NMR (CDCI3/TMS) 5(ppm) : 4.98 (2H,s), 5.47 (IH, s), 6.92 (2H,s), 7.39 (5H, s) In the above examples, the content of the crude products was measured by the following analytical condition using diphenyl phthalate as an internal standard. Device: Shimadzu GC-14A Gas Chromatography Column: J & W Scientific DB-1 (0.53mm X 30m, membrane thickness: 1.5/xm) Mobile phase: Helium 5ml/min. Detector: FID Injection Temperature: 300°C Detector Temperature: 300°C Column Temperature: 80t: (5min.) ->10°Cmin. - 300t: (20min.) According to the present production method, the 2,6-dichlorophenol compound given by formula (l), which is useful as intermediate for producing dihalopropene compounds having insecticidal/acaricidal activity, can be manufactured in high yield. wherein R represents a 3, 3-dihalo'2'propenyl group or a benzyl group or a benzyl group substituted by halogen atom(s), which comprises making a phenol compound of formula (2): wherein R has the same meaning mentioned above, react with suifuryl chloride in the presence of a secondary amine at the temperature in the range of 0 to 100°C. 2. The production method as claimed in claim 1, wherein R represents a 3,3- dihalo-2-propenyl group. 3. The production method as claimed in claim 2, wherein R represents a 3,3- dichloro-2-propenyl group. 4. The production method as claimed in claim 1, wherein R represents a benzyl group optionally substituted by at least one halogen atom. 5. The production method as claimed in claim 4, wherein R represents a benzyl group or 4-chlorobenzyl group. 6. The production method as claimed in claim 1, wherein the secondary amine is dialkylamine, dialkenylamine, alkylalkenylamine or dicycloalkylamine. 7. The production method as claimed in claim 6, wherein the secondary amine is diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diisopropylamine, di-sec-butylamine, ethylpropylamine, diallylamine, di(3-butenyl)amine, allylpropylamine, dicyclopropylamine, dicyclobutylamine, dicyclopentylamine or dicyclohexylalamine. 8. The production method as claimed in claim 1, wherein the molar ration of the secondary amine to the phenol compound of formula (2) used for the reaction is 0.001: 1 to 1:1. 9. The production method as claimed in claim 1, wherein the molar ratio of the sulphuryl chloride to the phenol compound of formula (2) used for the reaction is 1.5:1 to 3.0:1.

Documents:

0956-mas-2002 form-18.pdf

0956-mas-2002 petition.pdf

956-mas-2002-abstract.pdf

956-mas-2002-claims .pdf

956-mas-2002-correspondence others.pdf

956-mas-2002-correspondence po.pdf

956-mas-2002-description complete .pdf

956-mas-2002-form 1.pdf

956-mas-2002-form 26.pdf

956-mas-2002-form 3.pdf

956-mas-2002-form 5.pdf

956-mas-2002-other documents.pdf

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