Sulphonium bismethoxycarbonylmethylides react with acids by a pummerer-type reaction and by nucleophilic substitution on sulphonium salts formed by protonation of the ylides; the product distributions depend on both the ylides and acidity of solvents.
W. Ando, T. Toyama and T. Migita, J. Chem. Soc. D, 1971, 756 DOI: 10.1039/C29710000756
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