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A series of mandelic acid derivatives was oxidized with a bismuth-catalyzed oxidation system based on Bi0/DMSO/O2. Benzaldehyde and/or benzoic acid derivatives could be obtained chemoselectively depending on the catalytic system and the substitution on the aromatic ring. A strong substrate selectivity was observed, suggesting different oxidation mechanisms. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)
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Favier et al. (2002) studied this question.
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