Chemistry of the metal carbonyls. Part LVI. Reactions of bis(pentafluorophenyl)phosphine and tetrakis(pentafluorophenyl)diphosphine with Group VI metal hexacarbonyls

Abstract

Reactions between bis(pentafluorophenyl)phosphine and Group VI metal carbonyls have been investigated and the mono-, di- and tri-substituted complexes [(C₆F₅)₂PH]M(CO)₅(M = Cr, Mo, W), [(C₆F₅)₂PH]₂M(CO)₄(M = Cr, Mo), and [(C₆F₅)₂PH]₃Mo(CO)₃ characterised. Treatment of the monosubstituted chromium and molybdenum complexes with n-butyl-lithium affords (C₆F₅)₂P(Li)M(CO)₅(M = Cr, Mo). Reaction of tetrakis(pentafluorophenyl)diphosphine with Cr(CO)₆ and Mo(CO)₆ gave polymeric complexes [(C₆F₅)₄P₂M(CO)₄]_n(M = Cr, Mo), and small yields of the monosubstituted complexes [(C₆F₅)₂PH]Mo(CO)₅. The anions [M(CO)₅]^2–(M = Cr, Mo) react with (C₆F₅)₂PCl to give the monosubstituted diphosphine complexes (C₆F₅)₄P₂M(CO)₅. The chromium complex was also prepared from (C₆F₅)₂P(Li)Cr(CO)₅ and (C₆F₅)₂PCl.