BETA-GAMMA-UNSATURATED KETONES AND ISOPRENOIC DIENONES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS PERFUME COMPOUNDS AND FLAVOURINGS

摘要

Compounds of the general formula I: IMAGE I wherein R1 and R2 are equal or different alkyl-, alkoxyalkyl-, or aryl groups, or together form a ring; R3 is an allyl or benzyl radical; and R4 and R5 represent hydrogen, alkyl, alkoxyalkyl, alkenyl or further compounds of the formula II: IMAGE II wherein R1, R2, R4 and R5 have the meaning indicated above and R6 stands for hydrogen or methyl or to compounds which are modified by the addition of hydrogen to at least one olefinic or carbonylic double bond of compounds of the general formula I or II. The invention also relates to a process for preparing the new compounds. The compounds of the general formula II are obtained by thermal treatment of a selection of compounds of formula I, for which R3 stands for the allyl or methallyl radical. The compounds according to the invention are used as fragrant and flavoring substances.