A process for producing an .alpha.,.beta.-unsaturated ketone of the general formula ##STR1## wherein R.sub.1 represents a hydrocarbon group, R.sub.2 represents an organic group bonded through a carbon-carbon bond, R.sub.3 and R.sub.4 represent a hydrogen atom or a hydrocarbon group, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be linear or may form a ring when taken together in arbitrary combinations, which comprises contacting an .alpha.-disubstituted-.beta.-keto acid ester of 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 and R.sub.7 represent a hydrogen atom or a hydrocarbon group, with a catalyst consisting essentially of (a) a compound of a platinum-group metal and (b) and .alpha.,.omega.-alkylenedi(disubstituted)phosphine.
一种制备一般式为##STR1##的.alpha.,.beta.-不饱和酮的方法,其中R.sub.1代表一个碳氢基团,R.sub.2代表通过碳-碳键结合的有机基团,R.sub.3和R.sub.4代表氢原子或碳氢基团,当任意组合在一起时,R.sub.1,R.sub.2,R.sub.3和R.sub.4可以是线性的或可以形成环,其包括将一般式为##STR2##的.alpha.-二取代-.beta.-
酮酸酯与催化剂接触,所述催化剂基本上由(a)
铂族
金属化合物和(b).alpha.,.omega.-烷基二(二取代)膦组成。