Oxidation of 3,5-diamino-4-arylhydrazonopyrazoles with lead(IV) tetra-acetate provided 2-aryl-4-cyano-2H-1,2,3-triazoles in moderate yield. Tentative mechanisms via pyrazolotriazole and/or nitrene intermediates are proposed for this novel ring transformation.
Z. E. Kandeel, T. Fuchigami and T. Nonaka, J. Chem. Soc., Perkin Trans. 1, 1986, 1379 DOI: 10.1039/P19860001379
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