One-electron oxidation and triphenylmethylation of benzimidazolines by the triphenylmethyl cation

With triphenylmethyl perchlorate (tetrafluoroborate) 1, 2, 2, 3-tetrasubstituted benzimidazolines undergo electrophilic triphenylmethylation at position 5. In further reaction with the electrophilic agent the obtained 5-triphenylntethylbenzimidazolines are converted into radical-canons. They undergo a similar transformation during the action of silver perchlorate and molecular oxygen. The results from investigation of the radicalcations by ESR and PMR are given.