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Multinuclear magnetic resonance study of some mesoionic 1,3,4-triazoles

✍ Scribed by Wojciech Bocian; Jaroslaw Jaźwiński; Lech Stefaniak; Graham A. Webb

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
293 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

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 negative charge occurs on the atoms of the exocyclic groups, which also act as the site of protonation and salt formation. The most important experimental data for these interpretations are found to be the nitrogen shieldings and that for C‐5.

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