Thermal and base-induced rearrangements of furoxanylketones phenylhydrazones

The thermal recyclization of 3-methyl-4-acetyl(benzoyl)furoxans [3-methyl-4-acetyl(benzoyl)-1,2,5-oxadiazole 2-oxides] phenylhydrazones to oximes of 5-acetyl-4-phenyl(methyl)-2-phenyl-2H-1,2,3-triazole 1-oxide and the base-induced mononuclear heterocyclic rearrangement of the above phenylhydrazones to 4-phenyl(methyl)-5-(1-nitroethyl)-2-phenyl-2H-1,2,3-triazoles were found.