## Abstract ^1^H, ^13^C, ^14^N and ^15^N NMR data are reported for a series of mesoinoic 1,3,4‐triazoles and some of their salts. The results obtained show that the molecules studied exist in the cyclic mesoionic form with delocalization of the positive charge over the ring atoms. The corresponding
Synthesis and multinuclear magnetic resonance investigation of some 1,3-selenazole and 1,3-selenazoline derivatives
✍ Scribed by Helmut Duddeck; Ralf Bradenahl; Lech Stefaniak; Jaroslaw Jazwinski; Bohdan Kamienski
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 117 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.934
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✦ Synopsis
Abstract
The ^1^H, ^13^C, ^15^N and ^77^Se NMR data of various annelated 1,3‐selenazoles and ‐1,3‐selenazolines are discussed in terms of tautomerism, configurational and conformational preference as well as HOMO–LUMO transition energies. The interpretations are corroborated by semi‐empirical calculations. Divergencies in solution‐ and solid‐state ^77^Se NMR data are discussed. Copyright © 2001 John Wiley & Sons, Ltd.
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## Abstract ^1^H, ^13^C, ^14^N and ^15^N NMR methods were applied to the study of some Type A mesoionic 1,3‐diphenyltetrazoles with various exocyclic groups. The ring structures of these tetrazoles are confirmed by the nitrogen NMR data. The shielding of N‐4 increases consecutively by amounts of __
## Abstract For Abstract see ChemInform Abstract in Full Text.