Abstract
Oxidative additions of simple silanes and germanes of the type MH 4− n X n , in which M Si, Ge; X = halogen, to complexes of the type M(CO)X(PEt 3) 2, where M Rh, Ir; X = halogen had previously been thought frequently to proceed in a trans fashion to give species with hydride trans to silyl or germyl. By using material enriched with 13C in the carbonyl position and studying the couplings between carbonyl and hydride by 13C NMR spectroscopy, we have found, in all the cases examined, that hydride is in fact situated cis to silyl or germyl and not trans. The same was found to be the case for the reaction of SiH 2F 2 with Ir(CO)Cl(PEt 3) 2, which had not previously been investigated.
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