## Abstract Molecular modeling by molecular mechanics (MM2) calculations were used to predict conformational preferences of cyclic __N__โnitrosamines. The results were compared with ^1^H NMR data. The observed geminal coupling constants ^2^__J__ were considerably stronger for __syn__ than for __ant
Oxygen-17 NMR studies of N-nitrosamines
โ Scribed by Giovanni Cerioni; Angelo G. Giumanini; Giancarlo Verardo; Hans Dahn
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 472 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
Abstract
Natural abundance ^17^O NMR data for seven aliphatic, nine cyclic and thirteen aromatic Nโnitrosamines, recorded at room temperature in acetonitrile, are reported. Differences in chemical shifts among and within the three groups are discussed in terms of electronic and steric effects. The ฯ^+^ value for the Nโnitrosamine group was estimated. A comparison between amides and Nโnitrosamines was made.
๐ SIMILAR VOLUMES
## Abstract Natural abundance ^17^O and ^13^C NMR spectra for eleven diarylketenes are reported. ^17^O shifts show invariance with __para__ substitution and a shielding due to __ortho__ substitution. A buttressing effect is observed for bis(2,3,4,5,6โpentamethylphenyl)ketene. A comparison between k
The "0 NMR spectra of some esters are discussed and are correlated with -C N M R chemical shift and IR carbouyl stretching band data.
The natural-abundance \({ }^{17} \mathrm{O}\) NMR spectra of 35 ozonides have been examined with the following results: Symmetrically tetrasubstituted ozonides and symmetrically disubstituted ozonides give only one signal each for the ether and the peroxide \(O\) atoms. Unsymmetrically tetrasubstitu
## Abstract An efficient and convenient method of preparing ^17^O enriched phenols is described. Aryl boronic acids are oxidized with ^17^O enriched potassium hydroperoxide. The ^17^O labeled potassium hydroperoxide is prepared from the autoxidation reaction of benzhydrol with ^17^O enriched oxygen