Optically active diarylethoxysulphonium salts react with pyridine to afford the corresponding diaryl sulphoxides with retention of configuration at sulphur. The reaction of sulphoxonium salts bearing at least one hydrogen atom bonded to the α-carbon leads, in contrast, to α-pyridinio-sulphides.
R. Annunziata, M. Cinquini and S. Colonna, J. Chem. Soc., Perkin Trans. 1, 1973, 1231 DOI: 10.1039/P19730001231
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