PROCESS FOR SELECTIVELY MONOHYDROFORMYLATING DIOLEFIN.

摘要

An alpha-( (1-arylethenyl) phenyl) propionaldehyde of general formula (II) is produced by selective hydroformylation. The process comprises reacting a (1-arylethenyl)vinyl benzene represented by general formula (I) with CO and hydrogen under reaction conditions, 40 to 200 deg. C temp. and 5 kg/2-square cm or higher pressure, in the presence of a transition metal carbonylation catalyst. In formulae, Ar represents a substd. aryl gp. substits. being gps. other than a vinyl gp. Alpha-(3-(1-phenylethenyl)phenyl) propionaldehyde can also be produced from 3-(1-phenylethenyl) vinyl benzene by this method. The starting material to be hydroformylated may be a mixture of the vinyl benzene and a 1,1-di(substd. aryl)ethylene represented by general formula (III) where Ar1and Ar2 are the same or different substd. aryl gps. that can be substd. by gps. other than vinyl gps. The 1-1-di(substd. aryl)ethylene can be 1-phenyl-1-ethylphenyl-ethylene.