α-Bromophenacyldimethylsulphonium and the corresponding quaternary ammonium salts have been prepared. The sulphonium salt disproportionates in a dark reaction and photolysis causes C–S bond breakage. The ammonium salt does not disproportionate; on irradiation C–Br cleavage occurs, giving a ring-brominated rearrangement product.
T. Laird and H. Williams, J. Chem. Soc. C, 1971, 3467 DOI: 10.1039/J39710003467
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