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.
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