Reactions of Highly Branched Fluoroolefins with Methyllithium and Methylmagnesium Bromide: Formations of Unexpected Polyfluorocyclobutene and Polyfluoropentadiene Compounds

Introduction of a methyl group into hexafluoropropene trimers was achieved by reactions with organometallic carbon nucleophiles. Unusual cyclization and defluorination occurred simultaneously with a formation of methylated polyfluoroolefins: excess methyllithium provided a polyfluorocyclobutene compound, while a polyfluoropentadiene derivative was formed by use of excess methyllithium.