Synthesis of substituted 4H-imidaz o[1, 5 -a] benzimid azoles

1-Phenyl-4-benzylimidazo[1,5-a]benzimidazole (III) was synthesized and subjected to acetylation, azo coupling, and the Vilsmeier reaction at the 3 position. 1-Phenyl-3-cyano-4-benzylimidazo[l,5-a]benzimidazole (X) was also obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 395–397, March, 1973.See [1] for communication VII. This system was designated 4H-imidazo[5,1-b]benzimidazole in the preceding communications of this series.The UV spectra of alcohol solutions of the compounds were recorded with SF-4 and EPS-3 spectrophotometers. The PMR spectra of CDCl₃ solutions were recorded with a JNM-4H-100 spectrometer with an operating frequency of 100 MHz with tetramethylsilane as the internal standard. The IR spectra were recorded with a UR-10 recording spectrophotometer.