Chemistry of vinylidene complexes.

The reactions of Cp(CO)2Re=C=CHPh ( 2) with M(PPh3)4 (M = Pd, Pt) gave the μ-vinylidene complexes Cp(CO)2RePd(μ-C=CHPh)(PPh3)2 ( 3) and Cp(CO)2RePt(μ-C=CHPh)(PPh3)2 ( 1), respectively. The substitution of Ph2PCH2PPh2 (dppm) for the PPh3 ligands in 1 resulted in the formation of Cp(CO)RePt(μ-C(1)=C(2)HPh)(μ-CO)(dppm) ( 4). The structure of complex 4 has been determined by single-crystal X-ray diffraction analysis. The structural and spectroscopic characteristics of complexes 1, 3, and 4 were compared with the corresponding parameters of the manganese-containing analogs Cp(CO)2MnPd(μ-C=CHPh)(PPh3)2 ( 5), Cp(CO)2MnPt(μ-C=CHPh)(PPh3)2 ( 6) and Cp(CO)2MnPt(μ-C=CHPh)(dppm) ( 7). [ABSTRACT FROM AUTHOR]