15N NMR studies of the tautomeric equilibrium of some 1-hydroxybenzotriazoles
✍ Scribed by W. Schilf; L. Stefaniak; M. Witanowski; G. A. Webb
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 281 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-1581
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📜 SIMILAR VOLUMES
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.
## Abstract ^15^N chemical shifts of 3‐methyl‐1‐phenylpyrazole‐4,5‐dione 4‐phenylhydrazone (1), 4‐hydroxyazobenzene (2), 2‐hydroxy‐5‐__tert__‐butylazobenzene (3) and 1‐phenylazo‐2‐naphthol (4), monolabelled with ^15^N at α‐(compounds prepared from ^15^N‐aniline) and β‐positions (compounds prepared
MN NMR shielding data for some 3-methoxy-1,2,4-triazoles and related triazolones are reported. Assignments are given with the assistance of some INDOlS parameterized SOS Shielding calculations. From the ' ' N NMR shielding results it is possible to give a quantitative account of some potential prot
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