Abstract
The previously unknown 2-(pyrazol-4-yl)benzimidazoles containing aryl groups in the pyrazolyl ring have been obtained by the reaction of 2-phenacyl-1H-benzimidazole with aroylhydrazines. The compounds with nitrophenyl and pyridyl substituents in the pyrazole ring show pyrazolyl tautomerism with differences in the 1 H NMR spectra. A semi-empirical method is proposed to determine the tautomeric composition of the synthesized pyrazoles. Authors: I. B. Dzvinchuk, A. V. Vypirailenko, V. V. Pirozhenko, and M. O. Lozinsky. English Translation in Chemistry of Heterocyclic Compounds , 1999, 35 (11), pp 1319-1324 http://link.springer.com/article/10.1007/BF02252001
Published Version
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