## Abstract ^13^C NMR spectroscopic data are reported for the __s__‐triazolo‐__as__‐triazinones of five isomeric series. Comparison of their ^13^C chemical shifts and CH coupling constants allows the determination of the type of ring junction of the two heterocycles, as well as the predominant taut
13C NMR spectra of benzodiazepinones: Application to isomeric structure determination
✍ Scribed by A. Bernardini; Ph. Viallefont; E. M. Essassi; R. Zniber
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 233 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
A ^13^C NMR study of a number of substituted 1,5‐benzodiazepin‐2‐ones has been carried out, and shows that this technique is one of the rare spectroscopic methods which allows an unambiguous identification of the number and nature of the isomers formed in the condensation of a β‐ketoester with a substituted O‐phenylenediamine.
📜 SIMILAR VOLUMES
## Abstract The ^13^C NMR spectra of four pairs of 1,3,4‐thiadiazole/thiadiazoline isomers have been recorded using broad band and off‐resonance proton decoupling techniques and in the coupled mode. Differences in the chemical shifts of the heterocyclic ring and the carbonyl carbons allow identific
A set of 3-alkylaminoacroleins (R1NHCHxCHCHxO, R1 \ alkyl) were studied by 13C and 1H NMR spectroscopy in solutions of di †erent solvents and, for the simplest representative of the series, 3methylaminoacrolein, at di †erent temperatures. The equilibrium solutions of these compounds consists of mixt
The complete 1H and 13C assignment of two closely related isomeric triterpenoid derivatives (methyl 2a,3b-di-Oacetylolean-12-en-28-oate and methyl 2a,3a-di-O-acetylurs-12-en-28-oate) is described. In addition to 1D NMR methods, 2D shift-correlated NMR techniques (COSY, NOESY, HMBC and HMQC) were use
## Abstract The structures of cyclic polyketones, their hydrates and reduction products were studied in different solvents by ^13^C‐NMR. spectroscopy. In dimethylsulfoxide solution rhodizonic acid **(1)**, croconic acid **(2)** and squaric acid **(3)** exhibit signal averaging. In anhydrous tetrahy