REGIOSPECIFIC PREPARATION OF α,α-DIHALOFLUOROMETHYL PERFLUOROALKYL KETONES.
Acylation of F-phosphoranium salts with F-acyl chlorides gives the corresponding Z-perfluoro betaine in high yield.Subsequent chlorination or bromination regiospecifically yields the α,α-dihalofluoromethyl perfluoroalkyl ketones.