Abstract
The carbene complexes [Mn(CO) 3(L) 2CR(OMe)] PF 6 (L 2 = 1,2-bis(diphenylphosphino)ethane, R = Me, p-C 6H 4F, m-C 6H 4F; L = P(OMe) 3, R = Me), [Mn(CO) 4(PPh 3)CMe(OMe)] PF 6, [C 5H 5Fe(CO)(PPh 3)CMe(OMe)] PF 6 and [C 5H 5Mo(CO) 2(PPh 3)CMe(OMe)] PF 6 have been prepared by alkylation of the appropriate acylmetal complex with MeOSO 2F, followed by metathetical anion exchange with PF 6 −. Reactions of the manganese compounds with phosphines occur to give phosphonium salts, and the acylmetal complex is recovered; this reaction reaffirms the oxonium formulation generally accorded to these complexes. Reaction of the manganese diphos complexes with methyl or p-chlorophenyl isocyanides results in carbene ligand displacement, giving [Mn(CO) 3(diphos)CNR] PF 6. With the analogous trimethylphosphite complexes, insertion of the isocyanide into the carbene—metal bond occurs.
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