Studies on dehydro-L-ascorbic acid arylosazones. Part III. Oxidation of dehydro-L-ascorbic acid arylosazones

Abstract

Dehydro-L-ascorbic acid arylosazones have been converted by mild oxidising agents into 3,6-anhydro-3-arylazo-2-oxo-L-gulono-δ- lactone arylhydrazones. The structure of the phenylhydrazone was established by the n.m.r. and mass spectra of its acetate and by cyclisation to 5-hydroxy-1-phenyl-4-phenylazo-4-pyrazolin-3-one, the acetate of which was synthesised by another route. The u.v. and i.r. spectra of the compounds prepared are discussed.