L. Cottier et al., OXIDATION OF 5-HYDROXYMETHYLFURFURAL AND DERIVATIVES TO FURANALDEHYDES WITH 2,2,6,6-TETRAMETHYLPIPERIDINE OXIDE RADICAL - COOXIDANT PAIRS, Journal of heterocyclic chemistry, 32(3), 1995, pp. 927-930
The oxidation of 5-hydroxymethylfurfural (1) or 5-hydroxymethylfurfury
Iideneacetophenone (4) with various 4-substituted 2,2,6,6-tetramethylp
iperidine radicals (TEMPO) 3a-d and supporting co-oxidants gave corres
ponding aldehydes 2 or 5 in fair yields.