Bicyclic aldehyde derivatives of formula ##STR1## containing a single or a double bond in the position indicated by the dotted lines and wherein symbol R.sup.1 represents a hydrogen atom or a methyl radical and R.sup.2 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.
式为##STR1##的双环醛衍
生物,其中由虚线表示的位置包含一个单键或双键,符号R.sup.1代表氢原子或甲基基团,R.sup.2定义为含有1至6个碳原子的线性或支链烷基基团。化合物(I)作为
香料和调味剂具有特定的效用。从
环戊二烯或甲基取代的
环戊二烯和4-氧代-
丁烯酸烷基酯开始制备所述化合物(I)的过程。