Product Analyses of Ozone Mediated Nitration of Benzimidazole Derivatives with Nitrogen Dioxide: Formation of 1-Nitrobenzimidazoles and Conversion to Benzotriazoles
benzimidazole derivatives having electron-withdrawing or -donating substituent(s) at the benzene moiety were used as models of the imidazole moiety of purine bases and their nitration with nitrogendioxide and ozone (so-called Kyodai nitration) were examined. Products were extracted from the reaction mixture with AcOEt and their structures were analyzed. 1-Nitrobenzimidazole derivatives and unexpected