## Abstract The ^1^H{^15^N} NMR spectrum of 5,7‐diphenyl‐1,2,4‐triazolo[1,5‐__a__]‐pyrimidine (**3**) was measured by GHMQC, unambiguously assigned and compared with the spectra of 1,2,4‐triazolo[1,5‐__a__]pyrimidine (**1**) and 5,7‐dimethyl‐1,2,4‐triazolo[1,5‐__a__]pyrimidine (**2**). A series of
13C and 15N NMR study of 1,2,4-triazolo[1,5-a]pyrimidines with one tautomerism-introducing substituent
✍ Scribed by E. Kleinpeter; St. Thomas; G. Fischer
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 715 KB
- Volume
- 355
- Category
- Article
- ISSN
- 0022-2860
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract ^1^H, ^13^C and ^15^N NMR chemical shifts of 10 substituted pyrazolo[1,5‐__a__]pyrimidines were assigned based on DQF ^1^H, ^1^H COSY, PFG ^1^H, ^13^C HMQC and PFG ^1^H,X (X = ^13^C and ^15^N) HMBC experiments and on literature data. Copyright © 2002 John Wiley & Sons, Ltd.
## Abstract ^13^C and ^15^N NMR spectra of eight substituted 1,2,4‐triazines were measured and assigned. The assignments of the ^13^C NMR spectra were based on the substituent chemical shifts and ^__n__^__J__(C,H) coupling constants. ^15^N NMR chemical shifts generally showing well separated ranges
## Abstract The synthesis and assignment of ^15^N and ^13^C NMR signals of the 1,3,4‐oxathiazol‐2‐one ring in a series of __para__‐substituted 5‐phenyl derivatives are reported. DFT calculations of ^15^N and ^13^C chemical shifts correspond closely to observed values. Substituent effects are interp
## 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 ^13^C, ^14^N and ^15^N NMR data are reported for some mesoionic 2,3‐diphenyltetrazoles with nitrogen‐containing exocyclic groups, and the data confirm their cyclic structures. The protonated forms of these mesoionic structures contain hydrogen atoms at the exocyclic groups.