Journal of Heterocyclic Chemistry p. 1711 - 1716 (1996)
Update date:2022-08-11
Topics:
Lee, In-Sook Han
Jeoung, Eun Hee
Lee, Chang Kiu
Benzimidazoles containing furyl and thienyl substituents at C-2 were prepared by condensation of o-phenylenediamine and corresponding carboxylic acids in the presence of polyphosphoric acid. The 2-heteroarylbenzimidazoles showed tautomerism in dimethyl sulfoxide solution while 2-phenylbenzimidazole did not. The tautomerism appeared to be taking place by intermolecular relay of protons between stacked molecules.
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