Reactions of low-valent metal complexes with fluorocarbons. Part XX. Tricarbonyl(π-allyl and π-2-methylallyl)cobalt

Reactions of tricarbonyl(π-allyl and π-2-methylallyl)cobalt with tetrafluoroethylene and hexafluoropropene result in formal insertion of the fluoro-olefins into the carbon–cobalt σ bonds of the allyl systems to give stable σ, π-fluoroalkyl cobalt tricarbonyl complexes. These compounds react with triphenylphosphine to form σ-bonded derivatives such as CH2:C(R)CH2·CF2·CF2Co(CO)3PPh3(R = H or Me).Hexafluorobut-2-yne reacts with tricarbonyl(π-2-methylallyl)cobalt to form a complex in which two molecules of the acetylene are inserted between the cobalt atom and the allyl group.