Title of Invention	MIXTURE OF ISOMERS OF COMPOUND, AND PERFUMING COMPOSITION/PERFUMED ARTICLE MADE THEREFROM
Abstract	The present invention relates to the use as perfuming ingredient of a compound of formula (Formula I) in the form of any one of its isomers or of a mixture thereof, and having a boiling point above 250°C, as measured at a pressure of 1013 mbar.

Full Text

Technical field The present invention relates to the field of perfumery. More particularly, it concerns the use as perfuming ingredient of a compound of formula in the form of any one of its isomers or of a mixture thereof, and having a boiling point above 250°C, as measured at a pressure of 1013 mbar. The present invention concerns also the compositions or articles associated with said compound. Prior art Compounds having a strong tenacity and an odor of the type white flower and citronella are very rare and very much prized by perfumers. Indeed, compounds having such an odor are especially useful, inter alia, in functional perfumery. However, in the vast majority of the cases said compounds suffer from a lack of tenacity which renders them of little use in functional perfumery. It is the aim of this application to solve said problem by providing a compound having a. floral and citrus/citronella odor, while having a sufficient tenacity to allow its use also in functional perfumery. To the best of our knowledge the invention's compound has been only reported in the book by S. Arctander, 'Perfume and Flavor Chemicals", 1969, Montclair, New Jersey, USA. In. said book, the invention's compound has been mentioned under the reference number 825 and the name of decahydro-beta-naphthylacetaldehyde. However, the compound mentioned by Arctander's is described as having a boiling point of 236°C and an odor of the type "semi-dry, musty-woody with a remote resemblance to notes in ambergris" and "a tenacity very poor". Moreover, it is also stated that "the author believes that this material has little or no interest to the perfume industry". Therefore, Axctander's disclosure suggests only an odor, a tenacity and an interest in such compound which is at the opposite of what is aimed in said application, and is far from suggesting that a compound of formula (I) can be used as perfumaing ingredient to impart flower/citrus notes. Description of the invention We have now surprisingly discovered that the compound of formula in the form of any one of its isomers or of a mixture thereof, and having a boiling point comprised between 245°C and 264°C, as measured at a pressure of 1013 mbar; is a useful perfuming ingredient with a very good tenacity and which, unexpectedly, imparts odor notes of the floral and/or citrus, citronella type. The compound of formula (I) possesses three asymmetric carbon atoms, and the decaline group can have a cis or trans conformation, so as to adopt the following structures: wherein the hydrogen atoms are in a relative configuration. Therefore, as mentioned above, the compound of formula (T) can be in the form of any one of its diastereoisomers or stereoisomers. According to a preferred embodiment of the invention, the compound of formula Q) has a boiling point comprised between 246°C and 253°C, as measured at a pressure of 1013 mbar. Furthermore, according to another embodiment, said compound (I) is in the form of a mixture containing less than 50 % w/w of isomer (I-trans) and more than 50 % w/w of isomer (I-cis). More preferably, said mixture contains less than 30 % w/w of (I-trans) and more than 70 % w/w of (I-cis). As mentioned above, surprisingly, it has been found that the typical odor of the invention's compound contributes to the fragrance of composition, or perfumes, having an aldehyde, white flowers and/or citrus, citronella fragrance character or nature. In particular, an invention's mixture containing between 70 and 80% of isomer (I-cis) and between 30 and 20% of isomer (I-trans) possesses an aldehydic and flowery note together with a citrusy and citronella note. The flowery note is of the white fiower- lfUy of the valley-type and is also slightly linden. The citrusy note possesses a very natural citrus white peel aspect. The overall odor of this mixture is quite powerful and possesses also a tenacity and a long lastingness which are high for these odors notes. Said perfuming properties allow an easy use of the invention's mixture in any field of functional perfumery, as well as of fine perfumery. The pure cis or trans isomers according to the invention have similar odors and properties, although they possess a proper character. Isomer (I-cis), compared to the above mixture, is a bit fresher and has a citronella note more developed, while isomer (T-trans) is less powerful. The invention concerns also the use of a compound of formula (T) as perfuming ingredients, in particular to confer, enhance, improve or modify the aldehyde, white flowers and/or citrus character of a perfurning composition. In other words, it concerns a method to confer, enhance, improve or modify the odor properties of a perfurning composition or perfumed article, which, method comprises adding to said composition or article an effective amount of a compound of formula (I). Said method is particularly useful for conferring, enhancing, improving or modifying the aldehyde, white flowers and/or citrus notes to, or of, said perfuming composition or perfumed article. Therefore it is particularly useful for the perfuming compositions or perfumed articles having an aldehyde, white flowers and/or citrus character. By "use of a compound of formula (I)" it has to be understood here also the use of any composition containing the compound (T) and which can be advantageously employed in the perfumery industry as active ingredients. Said compositions, which are in fact perfuming compositions that can be advantageously employed as perfuming ingredients, are also an object of the present invention. Therefore, another object of the present invention is a perfuming composition comprising: i) as perfuming ingredient, a compound of formula (T) as defined above; ii) at least one ingredient selected from the group consisting of a perfumery carrier and a perfumery base; and iii) optionally at least one perfumery adjuvant. By "perfumery carrier" we mean here a material which is practically neutral from a perfumery point of view, i.e. that does not significantly alter the organoleptic properties of perfuming ingredients. Said carrier may be a liquid or a solid. As liquid carrier one may cite, as non-limiting examples, an emulsifying system, i.e. a solvent and a surfactant system, or a solvent commonly used in perfumery. A detailed description of the nature and type of solvents commonly used in perfumery cannot be exhaustive. However, one can cite as non-limiting examples solvents such as dipropyleneglycol, diethyl phthalate, isopropyl myristate, benzyl benzoate, 2-(2- ethoxyethoxy)-l-ethanol or ethyl citrate, which are the most commonly used. As solid carrier one may cite, as non-limiting examples, absorbing gums or polymers, or yet encapsulating materials. Examples of such materials, for example, may comprise wafl-forming and plasticizing materials, such as mono,, di- or trisaccharides, natural or modified starches, hydrocolloids, cellulose derivatives, polyvinyl acetates, polyvinylalcohols, proteins or pectins, or yet the materials cited in reference texts such as H. Scherz, Hydrokolloids : Stabilisatoren, Dickungs- und Gehermittel in Lebensmittel, Band 2 der Scbrrftenreihe Lebensmittelchemie, Lebensmittelqualitat, Behr's VerlagGmbH & Co., Hamburg, 1996. The encapsulation is a well known process to a person skilled in' the art, and may be performed, for instance, using techniques such as spray-drying, agglomeration or yet extrusion; or consists of a coating encapsulation, including coacervation and complex coacervation techniques. Generally speaking, by "perfumery base" we mean here a composition comprising at least one performing co-ingredient. Said perfuming co-ingredient is not of the formula (I). Moreover, by "perfuming co-ingredient" it is meant here a compound, which is used in perfuming preparation or composition to impart a hedonic effect. In other words such a co-ingredient, to be considered as being a perfuming one, must be recognized by a person skilled in the art as being able to impart or modify in a positive or pleasant way the odor of a composition, and not just as having an odor. The nature and type of the perfuming co-ingredients present in the base do not warrant a more detailed description here, which in any case would not be exhaustive, the skilled person being able to select them on the basis of its general knowledge and according to intended use or application and the desired organoleptic effect. In general terms, these perfuming co-ingredients belong to chemical classes as varied as alcohols, aldehydes, ketones, esters, ethers, acetates, nitriles, terpene hydrocarbons, nitrogenous or sulphurous heterocyclic compounds and essential oils, and said perflirning co-ingredients can be of natural, or synthetic origin. Many of these co-ingredients are in any case listed in reference texts such as the book by S. Arctander, Perfume and Flavor Chemicals, 1969, Montclair, New Jersey, USA, or its more recent versions, or in other works of a similar nature, as well as in the abundant patent literature in the field of perfumery. It is also understood that said co-ingredients may also be compounds known to release in a controlled manner various types of perfuming compounds. For the compositions which comprise both a perfumery carrier and a perfumery base, other suitable perfumery carrier than those previously specified can be also ethanol, water/ethanol mixtures, limonene or other terpenes, isoparaffins such as those known under the trademark Isopar® (origin: Exxon Chemical) or glycol ethers and glycol ether esters such as those known under the trademark Dowanol® (origin: Dow Chemical Company). Generally speaking, by "perfumery adjuvant" we mean here an ingredient capable of imparting additional added benefit such as a color, a particular light resistance, chemical stability, etc. A detailed description of the nature and type of adjuvant commonly used in perfuming bases cannot be exhaustive, but it has to be mentioned that said ingredients are well known to a person skilled in the art Preferred perfuming compositions are those having an aldehyde, white flowers and/or citrus character. An invention's composition consisting of a compound of formula (T) and at least one perfumery carrier represents a particular embodiment of the invention as well as a perfuming composition comprising a compound of formula (J), at least one perfumery carrier, at least one perfumery base, and optionally at least one perfumery adjuvant. Its is also understood here that, unless otherwise indicated or described, any mixture resulting directly from a chemical synthesis, e.g. without an adequate purification, in which the compound of the invention would be involved as a starting intermediate or end-product could not be considered as a perfirrning composition according to the invention. Furthermore, in view of its unexpected tenacity and odor properties, the compounds of formula (Tj are particularly useful in all the fields of modern perfumery to positively impart or modify the odor of a consumer product into which said compound of formula (I) is added. In particular to impart an aldehyde, white flowers and/or citrus character to the fragrance of said consumer product. Consequently, a perfumed article comprising: i) as perfuming ingredient, a compound of formula (I) or an invention's composition; and ii) a consumer product base, is also an object of the present invention. For the sake of clarity, it has to be mentioned that, by "consumer product base" we mean here a consumer product which is compatible with perfuming ingredients. In other words, a perfumed article according to the invention comprises the functional formulation, as well as optionally additional benefit agents, corresponding to a consumer product, e.g. a detergent or an air freshener, and an olfactive effective amount of at least one invention's compound. The nature and type of the constituents of the consumer product do not warrant a more detailed description here, which in any case would not be exhaustive, the skilled person being able to select them on the basis of its general knowledge and according to the nature and the desired effect of said product. Examples of suitable consumer products include solid or liquid detergents and fabric softeners as well as all the other articles common in perfumery, namely perfumes, colognes or after-shave lotions, perfumed soaps, shower or bath salts, mousses, oils or gels, hygiene products or hair care products such as shampoos, body-care products, deodorants or antiperspirants, air fresheners and also cosmetic preparations. As detergents there are intended applications such as detergent compositions or cleaning products for washing up or for cleaning various surfaces, e.g. intended for textile, dish or hard-surface treatment, whether they are intended for domestic or industrial use. Other perfumed articles are fabric refreshers, ironing waters, papers, wipes or bleaches. Some of the above-mentioned consumer product bases may represent an aggressive medium for the invention compound, so that it may be necessary to protect the latter from premature decomposition, for example by encapsulation. The proportions in which the compound of formula (I) according to the invention can be incorporated into the various aforementioned articles or compositions vary within a wide range of values. These values are dependent on the nature of the article to be perfumed and on the desired organoleptic effect as well as on the nature of the co- ingredients in a given base when the compounds according to the invention are mixed with perfuming co-ingredients, solvents or additives commonly used in the art. For example, in the case of perfuming compositions, typical concentrations are in the order of 0.001 % to 10 % by weight, or even more, of the compounds of the invention based on the weight of the composition into which they are incorporated. Concentrations lower than these, such as in the order of 0.01% to 5% by weight, can be used when these compounds are incorporated into perfumed articles. The compound of formula (T) is obtainable by a process comprising the following steps: a) the reaction of 2-decalone, in the form of any one of its isomers or of a mixture thereof, with an appropriate Witting reagent, such as MesPCEfeCOOMe; b) reducing the unsaturated ester obtained in step 2 into the corresponding saturated ester, for example by means of a hydrogenation; c) reducing the saturated ester into the saturated alcohol, for example by means of an alvuninum hydride; and d) oxidizing the alcohol obtained in step c) into the desired aldehyde, for example by means of a derivative of TEMPO. The above-mentioned process is illustrated in a particular embodiment in the Examples. The invention will now be described in further detail by way of the following examples, wherein the abbreviations have the usual meaning in the art, the temperatures are indicated in degrees centigrade (°C) ; the NMR spectral data were recorded in CDCI3 (if not stated otherwise) with a 360 or 400 MHz machine for :H and 13C, the chemical displacements 8 are indicated in ppm with respect to TMS as standard, the coupling constants J are expressed in Hz. Example 1 Synthesis of compounds of formula (D The starting material 2-decalone, was purchased from Aldrich SA (mixture 20 / 80 of trans/ cis 2-decalone). Pure cis or trans 2-decalone have been obtained by a distillation of 2-decalone on a Fisher column (1.4mbar, bath 93°C, B.p. 58°C for the trans, 10-15° higher for the cis). General procedure a) Formation of the unsaturated ester intermediate A 1L three-neck flask was charged with the required 2-decalone (50g, 328 mmoles), methyl (dimethoxyphosphoryl)acetate (77.6g, 426 mmoles) and 300ml of cyclohexane. Then 71g of a 30% w/w MeONa solution in MeOH was added over a period of 30 minutes. The temperature was maintained around 40°C with a water bath. After an additional period of 30 minutes, the reaction mixture was poured into cold water (200 ml) containing 10ml of acetic acid. The organic phase was washed with water and the solvent removed under vacuum. The crude product (70g) was used for the next step without further purification. b) Reduction of the unsaturated ester into the saturated ester The product obtained in step a) (70 g) and 2g of Pd-C 5% was put under 1 atmosphere of hydrogen overnight. After filtration, the crude product thus obtained was used for the next step without further purification, c) Reduction of the saturated ester into the saturated alcohol A 2 liter three-neck flask was charged with lithium aluminum hydride (8g, 210 mmoles) and 800ml of dry diethylether. To this solution was added dropwise a solution of the product obtained in step b) (70 g) in 100ml of ether, during the addition the temperature of the reaction medium was kept at around 30°C. The reaction was then carefully hydrolyzed with 60 ml of water, stirred 1 hour at room temperature and filtered over Celite®. The solvent was removed under vacuum and the product rapidly distilled under reduced pressure (Kugelrohr distillation, bp: 85°- 90°C /0.2 mbar). 52g of pure product were obtained (overall yield of approximativaly 85% from 2-decalone (3 steps)). d) Oxidation of the saturated alcohol into compound of formula (I) A 1.5L three-neck flask was charged with PIPO (1.17 g, see R.A. Sheldon et at, in Synlett 2001, 102), sodium bromide (0.14g), of the alcohol obtained in step c) (24.5g, 134mmoles) and 170 ml of ethyl acetate. After dissolution of PIPO, to the reaction mixture there was added, over 90 minutes, an aqueous solution of NaOCl (100 g - 12% solution, approx 1.1 eq) and containing also containing 2 g of sodium bicarbonate. During the addition, the temperature of the reaction medium was maintained at around 25°C. After an additional period of 30 minutes, the two phases reaction mixture was decanted. The organic phase was washed with water and the solvent removed under vacuum to obtain 22 g of crude product. A distillation under reduced pressure provided the desired compound (purity > 94-95% as measured by GC). Compound of formula (I-trans) starting from pure trans 2-decalone the desired compound was obtained in the form of a mixture of two isomers (65 / 35): Boiling point = 261°C at 1013 mbar MS (most important peaks): 180 (7,M+), 136(100) (identical for the both isomers) 13C NMR (for the mixture): 26.52,26.62, 28.10, 30.15, 32.85, 33.23, 33.61, 33.73, 33.87, 33.90, 34.07, 37.39, 37.81, 40.65, 42.84, 42.91, 43.56, 46.46, 51.42, 202.80, 203.02 JH NMR (for the mixture): 9.75 (1H, t, J = 1Hz); 2.48 (lH,m); 2.28 (IE, dd, J = 6Hz, J = 1Hz); 1.92 (1H, m); 1.7 (3H, m); 1.57 (4H, m); 1.5 (1H, m); 1.40 (1H, m); 1.22 (2H,m); 0.7-1.15 (5H,m) Compound of formula (I-cis) starting from pure cis 2-decalone the desired compound was obtained in the form of a mixture of two isomers (80 / 20): Boiling point = 247°C at 1013 mbar MS(most important peaks): 180 (2), 136 (100) (identical for the both isomers) 13C NMR(major isomer): 20.90 (t), 25.72 (t), 26.98 (t), 27.68 (t), 32.11 (t), 32.23 (t), 32.60 (t), 33.25 (d), 35.43 (d), 35.89 (d), 51.60 (t), 202.85 (d). 13C NMR (minor isomer): 21.5, 25.60, 26.64, 27.27, 33.47, 33.63, 33.74, 33.92, 35.76, 40.67,51.43,202.92 lB. NMR (for the mixture): 9.75 (1H, t, J = 1Hz); 2.30 (1H, dd, J = 6Hz, J = 1Hz); 2.27 (lH,m); 1.92 (1H, m); 1.7 (4H, m); 1.50 (4H, m); 1.4 (3H, m); 1.15 -1.35 (5H, m) Compound of formula (I) in the form of a (I-cis)/(I-trans) mixture (80/20) starting from pure commercial 2-decalone (Aldrich SA) the desired mixture was obtained in the form of a (80 / 20) mixture of isomers (I-cis)/(I-trans): Boiling point = 249°C at 1013 mbar MS(most important peaks): 180 (2), 136 (100) (identical for the both isomers) The 13C NMR and XH NMR spectra are best described by the sum of the above-mentioned spectra. Example 2 Preparation of a perfuming composition A perfuming composition of the citrus-herbaceous type, for a liquid detergent, was prepared by adrnixing the following ingredients : * in dipropyleneglycol 1) origin: Firmenich SA, Geneva, Switzerland 2) tetrahydro~4-methyl-2-phenyl~2H-pyran; origin: Firmenich SA, Geneva, Switzerland 3) methyl dihydrqjasmonate; origin: Firmenich SA, Geneva, Switzerland 4) mixture of 2/3-tridecenenitrile; origin: H&R, Germany 5) origin: International Flavors & Fragrances, USA The addition of 100 parts by weight of an invention's mixture, in the form of a mixtur containing 80% of (I-cis) and 20% of (I-trans), to the above-described functiona composition imparted to the latter a "clean", aldehyde and lily of the valley connotatior The overall effect obtained by the addition of the invention compound is best described b a boost of the citrus notes of the functional composition as well as a strong decrease of th fatty aspect given by the nitrile. No dry, musty-woody or ambergris notes have bee imparted by the addition of the invention's compound. * in dipropyleneglycol 1) origin: Firmenich SA, Geneva, Switzerland 2) dodecahydro-3a,6,6,9a-tetramethyl-naphtho[2,l-b]furan; origin: Firmenich SA, Geneva, Switzerland 3) pentadecenolide; origin: Firmenich SA, Geneva, Switzerland 4) methyl dihydrojasmonate; origin: Firmenich SA, Geneva, Switzerland 5) methyl ionone; origin: Firmenich SA, Geneva, Switzerland 6) 3-(4-tert-burylphenyl)-2-methylpropanal; origin: Givaudan-Roure SA, Vernier, Suisse The addition of 50 parts by weight of the invention's mixture, cited in Example 2, to the above-described floral-citrus functional composition imparted to the latter a strong fresh- lily of the valley note, slightly citrus, which could not be obtained by the addition of any of the known perfurning aldehyde. The fragrance of the composition thus obtained has also a quite clean aldehydic-citronellal connotation. As for the above example, no dry, musty-woody or ambergris notes have been imparted by the addition of the invention's compound. WE CLAIM: 1. A mixture of isomers of compound of formula having a boiling point comprised between 245 °C and 264°C, as measured at a pressure of 1013 mbar, in the form of a mixture containing less than 50% w/w of isomer (I-trans) and more than 50% w/w of isomer (I-cis), and wherein said isomers are of formula wherein the hydrogen atoms are in a relative configuration. 2. A mixture as claimed in claim 1, wherein the boiling point is between 246°C and 253°C, as measured at a pressure of 1013 mbar. 3. A mixture as claimed in claim 1, in the form of a mixture containing less than 30% w/w of isomer (I-trans) and more than 70% w/w of isomer (I-cis). 4. A method to confer, enhance, improve or modify the odor properties of a perfuming composition or perfumed article which method comprises adding to said composition or article an effective amount of a mixture, as claimed in any one of claims 1 to 3. 5. A method as claimed in claim 4, whereby there is conferred, enhanced, improved or modified the aldehyde, white flowers and/or citrus character of said perfuming composition or perfumed article. 6. A perfuming composition comprising i) at least a mixture, as claimed in any one of claims 1 to 3; ii) at least one ingredient selected from the group consisting of a perfumery carrier and a perfumery base; and iii) optionally at least one perfumery adjuvant. 7. A perfumed article comprising: i) at least one mixture, as claimed in any one of claims 1 to 3, or a composition, as claimed in claim 6; and ii) a consumer product base. 8. A perfumed article as claimed in claim 7, wherein the consumer product base is a solid or liquid detergent, a fabric softener, a perfume, a cologne or after-shave lotion, a perfumed soap, a shower or bath salt, mousse, oil or gel, a hygiene product, a hair care product, a shampoo, a body-care product, a deodorant or antiperspirant, an air freshener, a cosmetic preparation, a fabric refresher, an ironing water, a paper, a wipe or a bleach. The present invention relates to the use as perfuming ingredient of a compound of formula (Formula I) in the form of any one of its isomers or of a mixture thereof, and having a boiling point above 250°C, as measured at a pressure of 1013 mbar.

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