GB1322237A - Electrolytic dimerization of olefinically unsaturated compounds - Google Patents

Abstract

1322237 Electrolytic dimerization of olefinically unsaturated compounds BADISCHE ANILIN- & SODA-FABRIK AG 28 Aug 1970 [1 Sept 1969] 41500/70 Heading C7B [Also in Division C2] A process for the dimerization of an olefinically unsaturated compound in which R denotes an aromatic radical or an alkoxy group, R 1 denotes a hydrogen atom or an alkoxy group or (when R denotes an alkoxy group) an alkyl group, and R 2 denotes a hydrogen atom or an alkyl group or (when R denotes an aromatic radical) forms with R and the carbon atoms on which they are substituted a five- or sixmembered cyclo-aliphatic ring fused to the aromatic radical, or R 1 and R 2 alternatively form together with the carbon atoms on which they are substituted a fiveto twelvemembered cyclo-aliphatic ring, comprises electrolysing the compound in the presence of an electrolyte salt and an aliphatic alcohol having one to three carbon atoms and using graphite anodes whereby a dimer is obtained in which the carbon atoms bearing the R 2 radicals become linked together. The starting material may be vinyl (m)ethyl ether, vinyl n-butyl ether, styrene, p-ethyl styrene, p-chlorostyrene, indene or (m)ethoxy cyclohexene. The dimeric product may include the radicals R<SP>3</SP>O (where R<SP>3</SP>OH is the aliphatic alcohol present in the bath) attached to the outer carbon atoms of the product (to which R 1 are attached). Butadiene derivatives may be produced by elimination of these radicals R<SP>3</SP>O, e.g. with phosphoric acid.