## Abstract ^13^C‐ and ^15^N‐NMR. spectra have been measured for a series of triazenes. The results are compatible with the significant contribution of a structure such as II. One‐bond nitrogen‐nitrogen coupling constants are reported.
Tumour inhibitory triazenes. 5—15N NMR study of 1-aryl-3,3-dialkyltriazenes
✍ Scribed by Derry E. V. Wilman
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 256 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The variation of the ^15^N chemical shifts with substitution for a series of 1‐aryl‐3,3‐dialkyltriazenes is decribed. Good correlations were found between the relative chemical shifts at all three nitrogen sites and the electronic properties, as measured by the substituent coefficient, coefficient, σ, for the meta and para substituents in the aryl group. No such correlations were evident for variations in the 3‐alkyl substituents.
📜 SIMILAR VOLUMES
## Abstract The ^13^C NMR spectra of some 1,3‐diaryltriazenes, 3(1)‐aryl‐1(3)‐hetaryltriazenes and their methylated derovatives have been recorded. From the comparison of the ^13^C chemical shifts between 3‐aryl‐1‐(3,4‐dimethyl‐5‐isoxazolyl)triazenes 1 and compounds with fixed structure, such as 1‐
## Abstract Substituted 2‐(phenylamino)‐5‐phenyl‐1,3,4‐oxadiazoles were studied by ^15^N NMR spectroscopy. All signals were assigned on the basis of HMQC and HMBC experiments. Chemical shifts values were correlated with empirical Hammett parameters as well as with calculated electron densities and
The 15N NMR spectra of the novel seven-membered 1,2,3,5-tetrazepinone ring systems were studied. The chemical shift of N-2 was found to be signiÐcantly responsive to substituent changes at the phenyl ring. As the electron-withdrawing character of the substituents increased, N-2 became more deshielde
## 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.
## 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