Chemistry of vinylidene complexes 15. Transmetallation of mu-vinylidene MnPd complexes. Synthesis, X-ray diffraction analysis, and mass spectrometricstudy of the (eta(5)-C5H5)MnFe2(mu(3)-C=CHPh)(CO)(8) cluster

The reaction of Cp(CO)(2)Mn=C=CHPh (1) with Pd(PPh3)(4) followed by the rep lacement of the PPh3 ligands by diphosphines Ph2P(CH2)(2)PPh2 (dppe) or Ph2 P(CH2)(3)PPh2 (dppp) (where dppe is bis(diphenylphosphino)ethane and dppp i s 1,3-bis(diphenylphosphino)propane) afforded the binuclear complexes Cp(CO )(2)MnPd(mu-C=CHPh)(dppe) (2a) and Cp(CO)(2)MnPd(mu-C=CHPh)(dppp) (2b), res pectively. The reactions of 2a and 2b with Fe-2(CO)(9) gave the trinuclear complex CpMnFe2(mu(3)-C=CHPh)(CO)(8) (3). Competitive transmetallation took the second pathway to yield clusters containing the PdFe3 and PdFe2 cores. Complex 3 was also formed in the thermal reaction of compound 1 with Fe-2( CO)(9). Complex 3 was studied by IR spectroscopy, H-1 and C-13 NMR spectros copy, mass spectrometry, and X-ray diffraction analysis.