ISSN:
0749-1581
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The temperature-dependent 13C 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 1H NMR spectra of similar triazenes, regarding the likely contribution of a 1,3-dipolar resonance form to the ground state of the molecule.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260230206
