Previously kmown low-valent cobalt complexes HCo(PMe3)4 and HCo(HPPh2)4 have been synthesized using an improved method. These two hydride species have been studied for the activation of the Si-H bonds in silanes such as Ph3SiH, Ph2SiH2, PhSiH3 and (EtO)3SiH as well as central C-H bonds in diphosphinites. The resulting Si-H and C-H bond activated products have been characterized by 1H, 31P{1H], 13C{1H}NMR, IR spectroscopy, and X-ray crystallography. The activation of silanes with HCo(PMe3)4 appears to be reversible, and applying a phosphine scavenger shifts the equilibria to the silane activated products, providing the opportunity for isolationting the producs as solids.

Si-H and C-H bond activation with a well-defined cobalt(I) hydride complexes

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