Synthesis of benzimidazole derivatives

Phenylhalides of 1-phenyl-2-methylbenzimidazole were synthesized and converted to a new type of imidacyanin dye with phenyl groups on both nitrogen atoms of the benzimidazole residue. The heretofore unknown imidadicarbocyanins were obtained from quaternary salts of 1-phenyl-2-methylbenzimidazole (or its derivatives) which contain electronegative substituents in the 5 position.See [1] for Communication II.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1559–1561, November, 1970.