The oxidation of 5‐hydroxymethylfurfural (1) or 5‐hydroxymethylfurfurylideneacetophenone (4) with various 4‐substituted 2,2,6,6‐tetramethylpiperidine radicals (TEMPO) 3a‐d and supporting co‐oxidants gave corresponding aldehydes 2 or 5 in fair yields.
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Cottier et al. (1995) studied this question.
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