Diaryl, dialkyl and alkyl aryl sulfides are oxidized by cerium (IV) ammonium nitrate in H2 O/CH 2 Cl 2, in the presence of tetra-n-butylammonium bromide, at room temperature, to give sulfoxides in yields ranging between 90 and 100%.
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Baciocchi et al. (1988) studied this question.
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