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6945570 
Journal Article 
NMR STUDIES OF 2-ARYL DERIVATIVES OF BENZIMIDAZOLE, BENZIMIDAZOLIUM ION, AND BENZIMIDAZOLINE 
Lee, C; Lee, I; , 
2009 
Yes 
Heterocycles
ISSN: 0385-5414 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
78 
2 
425-433 
English 
WOS:000263714400012 
A series of 2-arylbenzimidazoles, 2-aryl-1,3-dimethylbenzimidazolium iodides, and 2-aryl-1,3-dimethylbenzimidazolines were prepared and their NMR spectra were examined. The substituent parameters were calculated for 2-benzimidazolyl, 2-benzimidazoliumyl, and 2-benzimidazolinyl groups on the chemical shifts of the protons and the carbons of benzene ring. The 2-benzimidazoliumyl group was found to cause a significant up-field shift of the ipso-carbon signal and down-field shift for the ortho- and para-carbon signals. On the other hand, the 2-benzimidazolyl and the 2-benzimidazolinyl groups cause down-field shift of the ipso-carbon signals but cause almost negligible change on the other carbon signals.