Nitrogen-15 NMR study of some barbituric acid derivatives
β Scribed by Antti O. K. Nieminen; Marjatta Rautio; Erkki Rahkamaa
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 418 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-1581
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3 NMR data are reported for 42 szoles, taken mostly at a standard concentration and in a common solvent (0.5 M dimethyl sulfoxide with a 0.01 M increment of Cr(acac), for each nitrogen atom present). Signal assignments were assisted by comparison witb ' " N line widths, the use of zJ(15N'H) coupling
N chemical shifts are reported for 10 mesoionic oxadiazoles and thiadiazoles. Some supporting 14 N and 13 C NMR data are also reported, together with some ab initio molecular orbital calculations and x-ray diffraction data. The relation between compound structure and 15 N chemical shifts is discusse