NEW CYCLIC KETONE, METHOD FOR IMPARTING, IMPROVING, ENHANCING OR MODIFYING PERFUMING CHARACTERISTIC OF PERFUME AND AROMATIC PRODUCT, PERFUME COMPOSITION, PROCESS FOR PRODUCING NEW COMPOUND AND INTERMEDIATE THEREFOR

摘要

Preparation of a compound of formula …IMAGE… in which the dotted lines show the location of a single or double bond, the symbol R1 denotes a hydrogen atom or a methyl radical, the symbol R2 denotes a saturated or unsaturated C1-C4 alkyl radical with a straight or branched chain, and the symbol R3 denotes a methyl, ethyl or methylene radical, with the exclusion of 1-(2,2,3,6-tetramethyl-1-cyclohexyl)-1-hexen-3-one and of 1-(2,2,3,6-tetramethyl-1-cyclohexyl)-3-hexanone, the process being characterised in that a compound of formula …IMAGE… in which the dotted lines and the symbol R3 are defined as above, is treated with a Lewis acid to obtain an aldehyde of formula …IMAGE… in which the dotted lines and the symbol R3 have the meaning shown above, and this aldehyde is converted into the compound (I) with the aid of reactions of a conventional type. …??This process makes it possible to obtain new compounds of formula …IMAGE… in which the dotted lines show the location of a single or double bond, the symbol R1 denotes a hydrogen atom or a methyl radical, the symbol R2 denotes a saturated or unsaturated C1-C4 alkyl radical with a linear or branched chain, with the exclusion of 4-(2,2,3,6-tetramethyl-1-cyclohexyl)-2-butanone, 4-(2,2,3,6-tetramethyl-1-cyclohexyl)-3-buten-2-one, 1-(2,2,3,6-tetramethyl-1-cyclohexyl)-1-hexen-3-one and 1-(2,2,3,6-tetramethyl-1-cyclohexyl)-3-hexanone, and of the particular isomeric forms of these compounds. The compounds (Ia) have advantageous olfactive properties and are consequently useful as perfuming ingredients for the preparation of perfuming compositions and scented articles.