Efficient cis-to-trans isomerization of 1,4- dihalobutene-2

Details Efficient cis-to-trans isomerization of 1,4- dihalobutene-2 Efficient cis-to-trans isomerization of 1,4- dihalobutene-2

C - Chemistry, Metallurgy

07

C

260/662.2, 204/9

C07C 21/02 (2006.01) C07C 17/00 (2006.01)

Patent

CA 1297500

Abstract of the Disclosure This invention relates to an efficient cis-to-trans isomerization of 1,4-dihalobutene-2 by means of a thiol or hydroyen bromide or hydrogen chloride catalyzed reaction. Said isomerization provides a high trans content greater than 90% which in turn is eminently suitable for condensation with malonic esters to provide excellent yields of dimethyl 2- vinylcyclopropane-1, 1-dicarboxylate with greater than 95% purity and with substantial elimination of 3,4-dichloro- butene-1.

552514

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