Cyclodehydrogenation of N-Benzylidene-o-phenylenediamines to 2,2'-Diaryl-1,1'-bibenzimidazoles with Dioxygen Catalyzed by Copper(I) Chloride in Pyridine. A Structural Study of 2,2'-Bis(3,4,5-trimethoxyphenyl)-1,1'-bibenzimidazole

Article abstract of DOI:10.1021/jo00352a016

2,2'-Diaryl-1,1'-bibenzimidazoles (10) were prepared in 32-66percent yields from N-benzylidene-o-phenylenediamines (1) through oxidation with dioxygen catalyzed by copper(I) chloride in pyridine.Substitution on the benzene ring in the benzylidene group se