Hydrosilylation of alkynes catalysed by trans- di-µ-hydrido-bis(tertiary phosphine)bis(silyl)diplatinum complexes
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 16,p. 1525-1529
- https://doi.org/10.1039/dt9770001525
Abstract
But-1-yne, phenylacetylene, but-2-yne, and diphenylacetylene undergo hydrosilylation in 70–90% yield using diplatinum complexes [{Pt(SiR3)(µ-H)[(C6H11)3P]}2][SiR3= Si(CH2Ph)Me2, SiCl3, or SiEtMe2] as catalysts. Many of the reactions proceed exothermically after initial warming of the reactants. The stereochemistry of the products from but-1-yne, phenylacetylene, and but-2-yne has been established by 1H n.m.r. spectroscopy. Hydrosilylation of but-1-yne and phenylacetylene affords as the major product trans-EtCHCHSiR3[SiR3= SiMe2Ph, SiEt3, SiCl3, SiCl2Me, SiClMe2, and Si(OEt)3] and trans-PhCHCHSiR3 respectively corresponding to cis-SiH addition. Products corresponding to non-terminal addition are formed in minor amounts, and not at all for phenylacetylene and the chlorosilanes. But-2-yne gives vinylsilanes cis-McCHC(Me)(SiR3), as expected for cis addition, and the same stereochemistry is inferred for the products from diphenylacetylene.Keywords
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