## Abstract The ^13^C NMR spectra of the natural coumarins ostruthin, osthol, aegelinol (enantiomer of decursinol), luvangetin, seselin, anomalin, oxypeucedanin (and its enantiomer prangolarin) and oxypeucedanin hydrate and some of their derivatives have been studied. Self‐consistent resonance assi
Carbon-13 NMR signals of some benzodiazepine drugs
✍ Scribed by Amarendra Patra; Apurba K. Mukhopadhyay; Alok K. Mitra; Aditi K. Acharyya
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 217 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Some carbon‐13 NMR signal assignments of diazepam, flurazepam, clonazepam and chlordiazepoxide have been revised and the assignments of nitrazepam are reported. The assignments of the various resonances were made by considering the changes in chemical shifts produced by the change of substituents and also by comparison with the chemical shifts of model compounds.
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Carbon-13 chemical shifts of eight 3H-1,4-benzodiazepine-2,5( lH, 4H)-diones are reported. The carbonyl chemical shifts have diagnostic value for distinguishing these diones from the isomeric 1,3-benzodiazepine-2,5-dione structures.
## Abstract Carbon‐13 NMR signal assignment of a number of polyoxygenated triterpenes of the olean‐12‐ene and urs‐12‐ene series, carried out by considering the changes in chemical shift produced by the change of oxygenation pattern(s), and using methyl oleanolate as a model, are reported.
## Abstract Carbon‐13 signal assignments of the labdane diterpenoids phlogantholide‐A, its diacetate and isophlogantholide‐A are reported. The assignments of the ^13^C NMR signals of 14‐deoxyandrographolide and its diacetate, made earlier, have now been confirmed by lanthanide shift studies on the