Azoles without N-substituents are oxidized with per-acids or perborate to the corresponding N-hydroxy substituted azoles. 1,2,4-Triazole and tetrazole produce two isomers separated through their O-benzyl derivatives. Imidazole and 1,2,3- and 1,2,4-triazole can be di-oxygenated in low yields. N-Hydroxypyrazole is deoxygenated by per-acid.
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Journal of the Chemical Society, Perkin Transactions 1
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