Synthesis and reactions of azides of heterocyclic compounds

Cyanine dyes containing azido groups in the 5 or 6 position of the benzazole ring were obtained from quaternary salts of azides of benzothiazole and benzimidazole. The introduction of an azido group into the dye molecule results in a considerable bathochromic effect.See [1] for communication II.Translated from Khimiya Geterotsiklicheskikh Soedinenii. No. 5, pp. 640–642, May, 1974.