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The condensation reaction of 1,5-diaryl-3-formazylglyoxylic acids (1) with 4,5-dimethyl-1,2diaminobenzene affords 1,5-diaryl-3-[2-(4,5-dimethyl-benzimidazol-2-yl)]-formazans (2) which have been transformed by reductive splitting into 5,6-dimethyl-benzimidazol-2-carboxamide arylhydrazones (3). Oxidative cyclization of formazanes (2) leads to the 2,3-diaryl-5-(4,5dimethyl-benzimidazol-2-yl)tetrazolium chlorides (4). The corresponding picrates (5) also have been prepared.

The synthesis of condensed imidazoles I. A simple synthesis of some 1,5-diaryl-3-[2-(4,5-dimethyl-benzimidazol-2-yl)]-formazanes and their derivatives