Acylchlorination and Related Reactions of Fluoroethenes Using AlCl3and FeCl3

Abstract Acylchlorination of mono-, 1,1-di-, and trifluoroethenes with carboxylic acid chlorides using AlCl3 and FeCl3 as a Lewis acid was investigated. In AlCl3-catalyzed reactions, fluorine-chlorine exchange reaction always occurred in part, while in FeCl3-catalyzed reactions Claisen-type condensation giving β-diketones was observed. Preparations of 2-chloro-2-fluoroethyl, 2-chloro-2,2-difluoroethyl, and 2-chloro-1,2,2-trifluoroethyl ketones are given.