The introduction of electronegative substituents onto the silyl group of triaryl(2-silylethylidene)phosphorane promotes eliminative silyl migration relative to the Wittig reaction; the combination of this effect with modification of the phosphorane substituents leads to highly diastereoselective reagents for alkenylation.
M. Tsukamoto, H. Lio and T. Tokoroyama, J. Chem. Soc., Chem. Commun., 1986, 880 DOI: 10.1039/C39860000880
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