Bicyclic aldehyde perfuming and flavoring ingredients

摘要

Bicyclic aldehyde derivatives of formula <IMAGE> (I) containing a single or a double bond in the position indicated by the dotted lines and wherein symbol R1 represents a hydrogen atom or a methyl radical and R2 defines a linear or branched alkyl radical containing 1 to 6 carbon atoms. Compounds (I) find specific utility as perfuming and flavoring agents. Process for the preparation of said compounds (I) starting from cyclopentadiene or a methyl substituted cyclopentadiene and an alkyl 4-oxo-butenoate.