In aqueous solution benzotriazole 1-oxide and its 4- and 6-nitro-derivatives exist largely in the N-oxide tautomeric forms. In ethanol the unsubstituted and 6-nitro-compounds are predominantly in the N-hydroxy-forms, but the 4-nitro-compound exists as a mixture of comparable amounts of the two tautomers.
F. T. Boyle and R. A. Y. Jones, J. Chem. Soc., Perkin Trans. 2, 1973, 160 DOI: 10.1039/P29730000160
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