Investigation of benzimidazole derivatives

Concise on Some Biologically Important 2-Substituted Benzimidazole Derivatives

“…Benzimidazolyl pyridinium salts (18) are prepared by condensation of pyridine and its derivatives with 2chlorobenzimidazoles. Heating of 2-chlorobenzimidazoles with excess pyridine or pyridine derivatives formed compounds (19) with a zwitterions structure [71][72][73].…”