Proton nuclear magnetic resonance spectroscopy: significant barriers to rotation about N-N bonds in 3-acylaminoquinazolin-4(3H)-one derivatives

El-Hiti, Gamal A. 1999. Proton nuclear magnetic resonance spectroscopy: significant barriers to rotation about N-N bonds in 3-acylaminoquinazolin-4(3H)-one derivatives. Spectroscopy Letters 32 (4) , pp. 671-677. 10.1080/00387019909350016

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Abstract

The proton NMR spectra of several 3-acylaminoquinazolin-4(3H)-one derivatives have been studied as a function of temperature. The changes, which were found to occur in the spectra at high temperatures, are discussed in terms of hindered rotation about the nitrogen-nitrogen bond. The free energies of activation for the rate determining stereochemical process were calculated to be as high as (14.7-20.6 Kcal mol-1) for hydrazine derivatives.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	quinazolin-4(3H)-one ; 1H NMR spectra ; hindered rotation ; free energy of activation ; stereochemical process ; chiral axis ; orthogonal conformation ; coalescence temperatures.
Publisher:	Taylor and Francis
ISSN:	0038-7010
Last Modified:	19 Mar 2016 22:25
URI:	https://orca.cardiff.ac.uk/id/eprint/15618

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