Preparation of diesters of hexenedioic acid

摘要

Diesters of hexene-1,6-dioic acid are efficiently and selectively prepared by reacting carbon monoxide and an alcohol with at least one diacyloxylated butene compound, in the presence of (a) a catalytically effective amount of a palladium-based catalyst and (b) a quaternary onium chloride or bromide of nitrogen or phosphorus.