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- Title
The enthalpies of dissociation of the N&bond;O bonds in two quinoxaline derivatives.
- Authors
Gomes, José R. B.; Monteiro, André R.; Campos, Bruno B.; Gomes, Paula; da Silva, Maria D. M. C. Ribeiro
- Abstract
The present work reports the first experimental thermochemical study of mono-N-oxides derived from quinoxaline, namely, 3-methoxycarbonyl-2-methyl-quinoxaline N-oxide and 3-ethoxycarbonyl-2-methyl-quinoxaline N-oxide. The values of the enthalpies of formation, in the condensed state, and of the enthalpies of sublimation, derived from static bomb calorimetry and Calvet microcalorimetry measurements, respectively, are combined to derive the standard molar enthalpies of formation in the gaseous phase for these two compounds. From the latter values, the first and second N&bond;O bond dissociation enthalpies for the corresponding di-N-oxides have been obtained. The gas-phase experimental results are also compared with calculated data obtained with a density functional theory approach. Copyright © 2008 John Wiley & Sons, Ltd.
- Subjects
ENTHALPY; THERMODYNAMICS; NITROGEN compounds; NITRENES; QUINOXALINES
- Publication
Journal of Physical Organic Chemistry, 2009, Vol 22, Issue 1, p17
- ISSN
0894-3230
- Publication type
Article
- DOI
10.1002/poc.1419