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
Applications of 15N NMR to a study of tautomerism in some monocyclic azoles
✍ Scribed by E. Bojarska-Olejnik; L. Stefaniak; M. Witanowski; B. T. Hamdi; G. A. Webb
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 391 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
M R shielding measurements reveal that thiolo-imidazole and -tetrazole exist almost entirely as the thione form. Quantitative estimates of the position of tautomerism in 1,2,3-triazole and tetrazole are obtained. The reported assignments are supported by means of INDO/S-SOS shielding calculations.
📜 SIMILAR VOLUMES
N NMR Shielding measurements are reported for a series of derivatives of some thiolopyridines. The results obtained are used to provide quantitatively reliable estimates of three tautomeric equilibria involving the pyridine nitrogen atom.
## Abstract 5‐Substituted 1,3,4‐thiadiazol‐2(3__H__)‐ones were shown to exist almost exclusively in the oxo tautomeric form with the aid of proton‐coupled ^15^N‐NMR spectra using the corresponding 3‐methyl‐1,3,4‐thiadiazol‐2(3__H__)‐ones and 5‐substituted‐2‐methoxy‐1,3,4‐thiadiazoles as reference c
## Abstract ^1^H n.m.r. spectra at ambient temperatures reveal that an equilibrium exists between the ‘all‐__trans__’ and ‘all‐__cis__’ isomers of some of the 1‐arylamino‐3‐aryliminopropenes. The ‘all‐__cis__’ isomer predominates in nonpolar solvents, whereas the ‘all‐__trans__’ isomer is favoured