Studies in the formation of heterocyclic rings containing nitrogen. Part V. The position of nitro group in the 1:2-disubstituted benziminazole from 4-nitro-o-phenylenediamine and benzaldehyde

1-benzyl-2-phenyl-5-nitro benziminazole and 1-benzyl-2-phenyl-6-nitro benziminazole have been synthesised starting from N-benzyl-2:4-dinitro aniline and 2:5-dinitro aniline respectively. The 1:2-disubstituted benziminazole obtained by the condensation of 4-nitro-o-phenylenediamine with benzaldehyde has been found to be identical with the 6-nitro benziminazole