Sulphides (5) and thiols (6) react instantly with the Pummerer rearrangement intermediates (3) at 0 °C to give sulphonium salts (7) and dithioacetals (8), respectively.
R. Tanikaga, Y. Hiraki, N. Ono and A. Kaji, J. Chem. Soc., Chem. Commun., 1980, 41 DOI: 10.1039/C39800000041
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