The reactions of o-phenylenediamine with 1,2,3-triketone 2-arylhydrazones containing alkyl substituents result in the predominant formation of 1-(benzimidazol-2-yl)-1,2-dioxoalkane arylhydrazones, whereas phenyl-substituted analogues afford 2-phenyl-benzimidazole.
1-(Benzimidazol-2-yl)-1,2-dioxoalkane arylhydrazones and 2-phenylbenzimidazole as the main products of the reactions of 1,2,3-triketone 2-arylhydrazones with o-phenylenediamine
O. G. Khudina, N. V. Murashova, Y. V. Burgart and V. I. Saloutin, Mendeleev Commun., 2003, 13, 228 DOI: 10.1070/MC2003v013n05ABEH001788
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