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Dynamic 13C NMR: A study of aryl-substituted 1-phenyl-3,3-tetramethylenetriazenes

✍ Scribed by N. Foster; B. Pestel

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
259 KB
Volume
23
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The temperature‐dependent ^13^C NMR spectra of a series of para‐substituted 1‐phenyl‐3,3‐tetramethylenetriazenes have been analyzed by the band width method. Electron‐donating substituents clearly accelerate the rate of rotation about the N‐2N‐3 bond in the triazenes; electron withdrawers retard that motion. The exchange averaging process observed in the carbon spectra obeys a linear free energy relationship when Hammett σ* parameters are used in the correlation. These results corroborate those already obtained by analysis of ^1^H NMR spectra of similar triazenes, regarding the likely contribution of a 1,3‐dipolar resonance form to the ground state of the molecule.

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