The steric and electronic interactions in several methanesulphonanilides and dimethane-sulphonanilides have been examined on the basis of their =C NMR chemical shifts. In aromatic amines there is evidence of nitrogen electron pair donation into the aromatic ring. However, the substitution of a metha
Oxygen-17 NMR study of electronic and steric effects in furan-2,3-dione derivatives
β Scribed by M. Hnach; H. Zineddine; R. Faure; J. P. Aycard
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 276 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
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(paraβsubstitutedβphenyl)furanβ2,3βdiones.
π SIMILAR VOLUMES
Porphyrins with steric hindrance at the periphery are known to exhibit severely non-planar macrocycle conformations. Among other dodecasubstituted porphyrins, the title compound has been studied widely and shows a typical saddle-distorted macrocycle. The specific conformation of the porphyrin leads