## Abstract Nitrogen‐15 NMR spectra of 11 ketenimines have been taken both at the natural‐abundance level of ^15^N and with the aid of ^15^N‐labeling. The nitrogen chemical shifts are substantially different from those of neutral imines and are upfield, more like those of protonated imines. The res
Nitrogen-15 nuclear magnetic resonance spectra of isocyanates, isothiocyanates and N-sulfinylamines
✍ Scribed by Issa Yavari; John S. Staral; John D. Roberts
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 257 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^15^N NMR spectra of ten isocyanates, four isothiocyanates, and four N‐sulfinylamines have been obtained at the natural‐abundance level by high‐resolution NMR spectroscopy. The results show that isocyanates and isothiocyanates have ^15^N chemical shifts over 200 ppm toward higher fields compared to those of N‐sulfinylamines. The sensitivity of the ^15^N shifts in these substances to substituent and electronic effects are discussed.
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%S and I4N NMR spectra of nine sulphnr-nitrogen compounds are reported. It is demonstrated that "N NMR gives high signal-to-noise spectra with good discrimination of chemical shifts. It is concluded that both I4N and "S NMR can make a useful contribution to the study of sulphur-nitrogen chemistry an
## Abstract Two‐to five‐bond ^15^N^19^F coupling constants have been determined for fluoropyridines, 8‐fluoroquinoline, fluoroanilines and fluoroaniline derivatives. Only in 2‐fluoropyridine is __J__(NF) large, and this is associated with a lone pair mediated enhancement of the coupling. Values in
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## Abstract The ^15^N NMR spectra of several substances with nitrogen—nitrogen bonds have been obtained at the natural‐abundance level by high‐resolution NMR spectroscopy. Azo (NN) nitrogens are 300–500 ppm deshielded compared with hydrazo (NHNH) nitrogens. The sensitivity of the ^15^N shifts
## Abstract The ^15^N chemical shifts of aniline, the toluidines, xylidines, and several halogen and oxygen substituted anilines have been measured at the natural abundance level of ^15^N. Substituent parameters obtained by multiple regression analysis show that the methyl group induces comparable