N-Heterocyclic Carbene Stabilized Dichlorosilylene Transition-Metal Complexes of V(I), Co(I), and Fe(0)

Reactions of N-heterocyclic carbene stabilized dichlorosilylene IPr center dot SiCl2 (1) (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) with (eta(5)-C5H5)V(CO)(4), (eta(5)-C5H5)Co(CO)(2), and Fe-2(CO)(9) afford dichlorosilylene complexes IPr center dot SiCl2 center dot V(CO)(3)(eta(5)-C5H5) (2), IPr center dot SiCl2 center dot Co(CO)-(eta(5)-C5H5) (3), and IPr center dot SiCl2 center dot Fe(CO)(4) (4), respectively. Complexes 2-4 are stable under an inert atmosphere, are soluble in common organic solvents, and have been characterized by elemental analysis and multinudear (H-1, C-13, and Si-29) NMR spectroscopy. Molecular structures of 2-4 have been determined by single crystal X-ray crystallographic studies and refined with nonspherical scattering factors.