## 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
N-15 NMR analysis of 1,2,3-thiadiazoles
✍ Scribed by Gerrit L'abbé; Pieter Delbeke; Lieve Bastin; Wim Dehaen; Suzanne Toppet
- Book ID
- 112130587
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1993
- Tongue
- English
- Weight
- 326 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0022-152X
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The M y proton-coupled 15N NMR spectra of pyrimidine with natural isotope abundance and of bis-labelled [1,3-"N2]p~dine, obtained using single pulse experiments, are described. The "N and 'H spectra are analysed for "J, 'J and 4J(NH) as well as N,N and H,H coupling constants.
## Abstract 5‐Phenyl‐1,2,4‐thiadiazole‐4‐^15^N and 3‐methyl‐5‐phenyl‐1,2,4‐thiadiazole‐4‐^15^N were synthesized from commercially available benazmide‐^15^N. The mass spectra and the ^1^H, ^13^C, and ^15^N‐nmr spectra of these compounds, which show various long‐range heteronuclear coupling with the