Abstract

The reaction of benzophenone hydrazone with 1-chlorobenzotriazole is complex and consumes three equivalents of the oxidant. One equivalent causes oxidation to diphenyldiazomethane which reacts rapidly with a second equivalent to give benzotriazolyldiphenylmethyl chloride. This reacts slowly with further 1-chlorobenzotriazole to give chlorine and dibenzotriazol-1-yldiphenylmethane (2) and the isomeric 3-benzotriazol-1-yl-6-(benzotriazol-1-ylphenylmethylene)cyclohexa-1,4-diene (3).

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