Benzimidazole is dearomatised by the diphenyl-amine derivative (1) to the novel hexacyclic system (5), the structure of which is confirmed by X-ray analysis; imidazole under similar conditions yields the bimolecular derivative (7).
J. C. Cass, A. R. Katritzky, R. L. Harlow and S. H. Simonsen, J. Chem. Soc., Chem. Commun., 1976, 48a DOI: 10.1039/C3976000048A
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