Abstract
The oxidation of 2-benzimidazolyl- and 2-quinoxalinylhydrazines with selenium dioxide in hydrochloric acid in the presence of cuprous chloride leads to the formation of 2-chloro derivatives of the heterocycles. When the reaction is carried out in ethanol, 2-benzimidazolylhydrazines give symmetrical formazans. In both cases oxidation proceeds through a step involving the formation of hetarenediazonium salts.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 265–267, February, 1983.
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Sedov, Y.A. Oxidation of some hetarylhydrazines with selenium dioxide. Chem Heterocycl Compd 19, 217–220 (1983). https://doi.org/10.1007/BF00506440
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DOI: https://doi.org/10.1007/BF00506440