A comparative study of the 13C chemical shifts and the 'H-13C and 19F-13C coupling constants of N-arylpyrazoles, pyrazolium salts and 2-methyl-and 2-vinylpyrazolium quaternary salts has been carried out. The effect of introducing a substituent at positions 2 and 5 of the pyrazole ring on the conjuga
Carbon-13 NMR of the N-substituents in 2,4,6-trisubstituted pyridinium salts
✍ Scribed by Salman R. Salman; M. A. R. Khayat
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 150 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The carbon-1 3 chemical shifts of seven Nsubstituted trimethylpyridinium and triphenylpyridinium salts and seven amines are reported.
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## Abstract ^13^C NMR spectra of 4‐substituted 3‐chloro‐ and 3‐bromo‐2,6‐dimethylpyridine __N__‐oxides in CDCI~3~ and their chemical shifts are reported. The influence of the electronic properties of the substituent in the 4‐position and the __ortho__ effect on the direction of chemical shifts and
The iniluence of substituents on the 'H, "C and 15N NMR chemical shifts of 2-substituted 5(6)nitrobenzimidazoles and their analogues labelled with 15N in the nitro group was investigated. It was found that the substituent effects are transmitted to the carbon and hydrogen nuclei in positions 4-7 mai