There is disclosed a process for preparing unsaturated ketones especially terpenoid ketones, by subjecting a substituted propargyl alcohol of formula (II) ##STR1## wherein R is a group containing 1 or 2 substituted or unsubstituted alkyl- or alkylene units containing 4 carbon atoms each to a thermal treatment sufficient to rearrange its structure in order to obtain structurally isomeric unsaturated ketones of formula I ##STR2## wherein one of the substituents X.sub.3 and X.sub.4 is hydrogen and the other and Z.sub.2 together form a bond. The process can be effected in the presence of an isomerization catalyst, which leads to high percentage of .alpha...beta.,.gamma...delta.-unsaturated ketones. The ketones of formula I are useful as perfumes and as intermediates for the production of terpenoid compounds.
本发明揭示了一种制备不饱和酮,特别是萜酮的方法,通过将式(II)的取代
丙炔醇进行热处理,以重排其结构,从而获得结构异构的不饱和酮,其中 X.sub.3 和 X.sub.4 的取代基之一是氢,另一个和 Z.sub.2 共同形成键。该过程可以在异构化催化剂存在下进行,从而产生高百分比的α...β,γ...δ-不饱和酮。式(I)的酮可用作香
水和
萜类化合物生产的中间体。