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The hydrosilylation of terminal alkynes by silanes catalyzed by N -heterocyclic carbene platinum (0) complexes has been investigated. The alkynes included 1-octyne and phenylacetylene. The silanes investigated were bis (trimethylsilyloxy) methylsilane, (trimethylsilyloxy) dimethylsilane, tert -butyldimethylsilane, triphenylsilane, phenyldimethylsilane, triethylsilane, and triethoxysilane. X-ray crystal structures for Pt (N, N ‘-dicyclohexylimidazol-2-ylidene) (η 2 -dimethylacetylenedicarboxylate) 2 (8) and PtC (E) C (E) −C (E) C (E) (N, N ‘-dimethylbenzimidazol-2-ylidene) (σ-NCCH 3) (10) (E = CO 2 Me) have been obtained. A selectivity model, based on structural parameters of the N- heterocyclic carbene, has been devised in order to rationalize the observed regioselectivity obtained. By a judicious choice of catalyst, alkyne, and silane, the regioselectivity of the addition can be controlled.
Bo et al. (Fri,) studied this question.
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