Synthesis of some benzimidazole,benzoxazole and benzothiazole derivatives. Action of aliphatic selenonesters on some o-phenylenediamine,o-amino-phenol and o-aminothiophenol and their derivatives

Aliphatic selenonesters react with o-phenylenediamine, o-aminophenol and o-aminothiophenol and their derivatives to form benzimidazole, benzoxazole and benzothiazole derivatives, respectively. The mass and nmr spectra of the mentioned compounds were studied.