## Abstract ^17^O NMR was used to probe the steric and electronic substituent effects in furanβ2,3βdione derivatives. The carbonyl ^17^O chemical shifts correlate with Hammett constants and IR carbonyl stretching band frequencies for 5β(__para__βsubstitutedβphenyl)furanβ2,3βdiones.
Oxygen-17 NMR study of steric interactions in hindered N-substituted imides
β Scribed by Baumstark, A. L.; Dotrong, M.; Oakley, M. G.; Stark, R.; Boykin, D. W.
- Book ID
- 126823293
- Publisher
- American Chemical Society
- Year
- 1987
- Tongue
- English
- Weight
- 500 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0022-3263
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π SIMILAR VOLUMES
Bamers to rotation about the partial double C-N' bond were determined from line shape analysis of 'H and I3C dynamic NMR spectra of N',N'-dimethyl-NZ-substituted phenylacetamidines with twelve different substituents on the phenyl ring. The values of AGGc are 51.2-58.7 kJ mol-' and the correlation wi
## Abstract Natural abundance ^17^O NMR spectra were recorded for ten methoxyflavones and one flavonol. The chemical shifts are discussed in terms of steric and conformational changes. They are related to previously reported ^13^C NMR data.