Superoxide catalyzed oxidation of 4-alkylsubstituted pyrazol-5-ones to 4-alkyl-4-hydroxysubstituted pyrazol-5-ones

Abstract

Superoxide ion, generated in situ by the phase transfer reaction of potassium superoxide and tetraethylammonium bromide, brings about an easy oxidation of different 4-alkylsubstituted pyrazol-5-ones to yield 4-alkyl-4-hydroxy pyrazol-5-ones in reasonably good yields.