The intramolecular carbomagnesiation of a vinylsilane at 25 °C in THF has been found to proceed in a stereospecific (>95%) syn-addition of carbon and magnesium to the double bond. The resulting α-silylalkylmagnesium compounds are not configurationally stable under the reaction conditions. They epimerize with a half-life of 2.7 d at room temperature.
R. W. Hoffmann, O. Knopff and T. Faber, J. Chem. Soc., Perkin Trans. 2, 2001, 1785 DOI: 10.1039/B103801J
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