Investigation of benzimidazoles. III—transmission of the substituent effects in 2-substituted 1-methylbenzimidazoles studied by13C nuclear magnetic resonance

Autor:	I. A. Titova, E. F. Shibanova, Lyudmila I. Larina, M. G. Voronkov, Tamara I. Vakul'skaya, V. A. Lopyrev, E. E. Liepin'sh
Rok vydání:	1982
Předmět:	chemistry.chemical_compound Nuclear magnetic resonance Chemistry Chemical shift Substituent Electronic effect Resonance General Materials Science General Chemistry Carbon-13 NMR
Zdroj:	Organic Magnetic Resonance. 20:212-216
ISSN:	1097-458X 0030-4921
DOI:	10.1002/mrc.1270200404
Popis:	The influence of substituents on the 13C NMR chemical shifts of 2-substituted 1-methylbenzimidazoles has been investigated. The electronic effects of the substituents are transmitted to C-4 and C-7 mainly by the resonance mechanism, and to C-5, C-6 and N-CH3, by approximately equal contributions of the resonance and inductive components. A critical analysis of the share in the transmission of substituent effects through the ‘pyridine-type’ and ‘pyrrole-type’ nitrogen atoms is given.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4d6f6fddfc11dd0d5619ed89ffb32e0c https://doi.org/10.1002/mrc.1270200404 Zobrazit plný text záznamu Plný text