Efficient cis-to-trans isomerization of 1,4-dihalobutene-2
AssigneeNational Distillers and Chemical Corporation
InventorsClarence E. Clark, Jr., Richard G. Fayter, Jr.
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Abstract
This invention relates to an efficient cis-to-trans isomerization of 1,4-dihalobutene-2 by means of a thiol or hydrogen bromide or hydrogen chloride catalyzed reaction.
Claims3
A process for isomerizing 1,4-dichlor-butene-2 to provide a high ratio of trans-to-cis-1,4-dichlorobutene-2 which comprises contacting a mixture of trans-1,4-dichlorobutene-2 and cis-1,4-dichlorobutene-2 with anhydrous hydrogen bromide catalyst and an initiator, selected from the group consisting of 2,2'-azobisisobutyronitrile and ultraviolet light, for the reaction at a temperature of from about 25.degree. C. to about 80.degree. C. and for a sufficient time wherein the final mixture contains at least 90% trans-1,4-dichlorobutene-2.
Dependencies are inferred from the claim text.