13C NMR spectra and distribution of electron density in some dipyridyl N-oxides
β Scribed by G. V. Kireev; V. B. Leont'ev; Yu. V. Kurbatov; O. S. Otroshchenko; A. S. Sadykov
- Book ID
- 112442054
- Publisher
- Springer
- Year
- 1978
- Tongue
- English
- Weight
- 168 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1573-9171
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract The ^13^C chemical shifts of 37 pyrazines, including their __N__βoxides, are reported. Substituent effects of methyl, phenyl and __N__βoxide groups on the chemical shifts were examined. To comprehend these effects, the chemical shifts were compared with charge densities calculated by th
13C and "N NMR spectroscopic assignments are given for a series of N-aryl-N-cyanoguanidines in DMSO-d, along with those for a few related cyanoguanidines. The NMR data are interpreted in terms of minimal overlap of the amino lone pair with the attached aryl ring, and a planar guanidine structure wit
Aromatic I3C chemical shifts of 4-and hubstituted pyridine N-oxides in aprotic and protic solvents are reported and discussed. Changes in chemical shifts caused by hydrogen bonding and protonation are much smaller than those induced by a substituent, and are not related to the pK, values of N-oxides