Comparison of the "C and "N NMR spectra of 8-azatheophylline with those of its three methylated derivatives and other model compounds from the literature showed that 8-azatheophylline exists to the extent of 80% in the N-2 tautomeric form in DMSO solution.
Application of 13C and 15N NMR spectroscopy to structural studies on nitramines
✍ Scribed by Suryanarayana Bulusu; Theodore Axenrod; Joseph R. Autera
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 421 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
^15^N and ^13^C chemical shifts and the ^1^J(^15^N^15^N), ^1^J(^15^N^13^C) and ^1^J(^13^CH) coupling constants have been determined for a number of ^15^N‐enriched cyclic and acyclic secondary nitramines. The results are interpreted in terms of both electronegativity effects and conformational factors.
📜 SIMILAR VOLUMES
## Abstract ^13^C and ^15^N NMR data for twelve __N__‐unsubstituted pyrrolidines are reported and __cis__ and __trans__ stereomers are assigned for 2,3‐, 2,4‐ and 2,5‐disubstituted compounds.
The tautomerism and isomerism of triazoles make the structure analysis of such compounds a difficult problem, and in the case of several nitrotriazoles a detailed structure assignment had been lacking up to now. Supported by selected compounds, a deÐnite structure determination of ten nitrotriazoles
13C and "N NMR spectroscopic assignments are given for a series of N-aryl-N-cyanoguanidines in DMSO-d, along with those for a few related cyanoguanidines. The NMR data are interpreted in terms of minimal overlap of the amino lone pair with the attached aryl ring, and a planar guanidine structure wit
## 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