18O-isotope effect in 13C nuclear magnetic resonance spectroscopy: 5—Substituent group electronic effects in substituted acetophenones
✍ Scribed by John M. Risley; Shawn A. DeFrees; Robert L. Van Etten
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 897 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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## Abstract The substituent influence on the ^1^H and ^13^C NMR chemical shifts in 2‐substituted benzimidazoles and their anions and cations has been investigated. The transmission of the electronic effects of substituents from C‐2 to C‐5 (6) is approximately 20% less effective than that in the opp
## Abstract The influence of substituents on the ^13^C 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__‐CH~3~, by approximately eq