Dynamic  13 C NMR: A study of aryl‐substituted 1‐phenyl‐3,3‐tetramethylenetriazenes | Zendy

Foster N. | Zendy; Pestel B. | Zendy

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

Author(s) -

Foster N.,

Pestel B.

Publication year - 1985

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.1260230206

Subject(s) - chemistry , aryl , spectral line , carbon 13 nmr , nmr spectra database , resonance (particle physics) , molecule , proton nmr , dipole , nuclear magnetic resonance spectroscopy , computational chemistry , stereochemistry , organic chemistry , atomic physics , alkyl , physics , astronomy

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‐2N‐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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