Chemistry of the metal carbonyls. Part XXXVII. Reactions of some carbonylmetal anions with 1,2-dichlorohexafluorocyclopentene and related compounds

Abstract

Reaction between chlorotrifluoroethylene and the anions [Re(CO)₅]^– and [π-C₅H₅·Fe(CO)₂]^– gives σ-perfluorovinyl–metal complexes; the weaker nucleophile [Mn(CO)₅]^– adds to the olefin affording HCCIF·CF₂·Mn(CO)₅. All three anions react with 1,2-dichlorohexafluorocyclopentene, giving complexes in which the metal has replaced one of the chlorine atoms. With 1,2-dichlorohexafluorocyclobutane, elimination of both chlorine atoms occurs, the resulting perfluorocyclobutene reacting further to give small amounts of the previously reported σ-perfluorocyclobutenylmetal complexes. Treatment of chloromercuriferrocene with [Re(CO)₅]^– gives diferrocenylmercury, mercury, and pentacarbonyl(chloro)rhenium.