The present invention relates to a novel process for preparing unsaturated aldehydes comprising four double bonds of formula ##SPC1## Wherein one of the double bonds is represented by the dotted lines. Aldehyde Ia (called .alpha.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the main carbon chain. Aldehyde Ib (called .beta.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the side chain. The invention also relates to new intermediates used in the said new process and to methods for preparing them. The said intermediates have also valuable organoleptic properties and are useful as fragrances in the preparation of perfumes, perfumed products and artificial essential oils.
本发明涉及一种制备具有四个双键的不饱和醛的新工艺,其
化学式为##
SPC1## 其中一个双键由虚线表示。醛Ia(称为.alpha.-sinensal)对应于上述式子,其中由虚线表示的双键位于主碳链中。醛Ib(称为.beta.-sinensal)对应于上述式子,其中由虚线表示的双键位于侧链中。本发明还涉及用于所述新工艺的新中间体以及制备它们的方法。所述中间体还具有有价值的感官特性,并且可用作
香料,用于制备香
水,香味产品和人造精油。