Dhr. Barton et al., OXIDATION OF PHENYLHYDRAZONES OF ALPHA-KETO ESTERS WITH HYPERVALENT ORGANOIODINE REAGENTS, Tetrahedron letters, 34(45), 1993, pp. 7191-7194
Alpha-Ketoacids and ketones can easily be regenerated in high yield fr
om their phenylhydrazones via hydroxy azo compounds upon oxidation wit
h hypervalent iodine reagents.