The Pummerer reactions of alkyl phenyl sulfoxides, PhS(O)R (R: methyl and isobutyl), and benzyl methyl sulfoxide with acetic anhydride were found to proceed through the intermolecular acetoxyl migration, based on the 18O-tracer experiments with 18O-labeled sulfoxides and unlabeled acetic anhydride.
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Ito et al. (1983) studied this question.
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