A process for producing alpha,beta-unsaturated ketones represented by the following general formula ##STR1## wherein R.sub.1 represents a hydrocarbon radical, R.sub.2 represents an organic radical bonded through a carbon-carbon bond, R.sub.3 and R.sub.4 represent a hydrogen atom or a hydrocarbon radical, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be straight-chained or form a ring in arbitrary combinations, which comprises contacting an alpha-disubstituted-beta-keto acid ester represented by the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined, and R.sub.5, R.sub.6, R.sub.7 and R.sub.8 represent a hydrogen atom or a hydrocarbon radical, with a catalyst consisting essentially of (a) a compound of a platinum-group metal and optionally (b) a monodentate ligand (b).
一种生产以下通式所示的α,β-不饱和酮的方法:##STR1## 其中R.sub.1代表一个碳氢基团,R.sub.2代表通过碳-碳键连接的有机基团,R.sub.3和R.sub.4代表氢原子或碳氢基团,R.sub.1,R.sub.2,R.sub.3和R.sub.4可以任意组合成直链或环形结构,该方法包括将一个α-二取代-β-
酮酸酯与催化剂接触,该α-二取代-β-
酮酸酯的通式如下:##STR2## 其中R.sub.1,R.sub.2,R.sub.3和R.sub.4如上所定义,R.sub.5,R.sub.6,R.sub.7和R.sub.8代表氢原子或碳氢基团,所述催化剂主要由(a)
铂族
金属化合物和可选的(b)单齿
配体(b)组成。