Substituent Chemical Shifts of 2-Aryl Derivatives of Benzimidazole, Benzimidazolium Ion, and Benzimidazoline

초록

NMR spectra of a series of 2-arylbenzimidazoles, 2-aryl-1,3-dimethylbenzimidazolium iodides, and 2-aryl-1,3-dimethylbenzimidazolines were examined by correlating (1)H and (13)C chemical shift values with the Hammett substituent constants sigma. The signals corresponding to C-2 of the imidazole ring show good correlation with the largest rho values in each series. The rho values for C-2 of the benzimidazoles and the benzimidazolium. ions were very close, but that of the benzimidazoline was about a half of the former series.

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