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Stable ylide which undergoes the Wittig reaction with aldehydes to give substituted methyl acrylates. For a detailed study of the reaction with benzaldehyde, see J. Org. Chem., 59, 1126 (1994). For use of high pressure to increase the yield and trans-selectivity of reaction with aromatic aldehydes, see: Liebigs Ann. Chem., 2135 (1983). For tandem Wittig reaction and Cope rearrangement, see: J. Chem. Soc., Chem. Commun., 381 (1995).Strong base, for example Na bis(TMS)amide, brings about elimination of methanol, giving ketenylidenetriphenylphosphorane, which reacts with ɑ-hydroxy-ketones, e.g. in the steroid series, to give butenolides, by acylation and Wittig cyclization: Chem. Ber., 113, 2038 (1980). Review of phosphacumulene ylides: Angew. Chem. Int. Ed., 16, 349 (1977).