Process for the preparation of .delta.-ethylenic carbonyl compounds of the formula: ##STR1## by the oxy-Cope rearrangement of a diethylenic alcohol of the formula: ##STR2## in which the transformation is carried out in the presence of a catalytic amount of a divalent palladium compound. In the depicted formulae R.sub.1, R.sub.4 and R.sub.6 each represent a hydrogen atom or a hydrocarbon radical, R.sub.2 represents a hydrogen atom and R.sub.3 and R.sub.5 each represent a hydrocarbon radical, or R.sub.3 and R.sub.4 together represent an alkylene radical (--CH.sub.2 --).sub.n (wherein n is an integer from 3 to 20 inclusive) in which one or more carbon atoms can optionally carry as substituent(s) one or more alkyl radicals containing 1 to 4 carbon atoms. The carbonyl products are useful as starting materials for the preparation of compounds intended for use in pharmacy, in agriculture or perfumery.
制备.delta.-
乙烯基羰基化合物的过程:通过二
乙烯基醇的氧-科普重排反应,其
化学式为:##STR2## 在二价
钯化合物的催化下进行转化。在所示的
化学式中,R.sub.1、R.sub.4和R.sub.6分别代表氢原子或烃基,R.sub.2代表氢原子,R.sub.3和R.sub.5分别代表烃基,或R.sub.3和R.sub.4一起代表一个含有1到4个碳原子的烷基(--CH.sub.2 --).sub.n(其中n是从3到20的整数),其中一个或多个碳原子可以选择地带有一个或多个烷基取代基。这些羰基产物可用作制备用于药学、农业或
香料的化合物的起始材料。