Kinetic applications of electron paramagnetic resonance spectroscopy. 32. Further studies of quantum-mechanical tunneling in the isomerization of sterically hindered aryl radicals

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DOIResolve DOI: http://doi.org/10.1021/ja00481a031
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  1. National Research Council Canada
TypeArticle
Journal titleJournal of the American Chemical Society
ISSN0002-7863
Volume100
Issue13
Pages4197–4200; # of pages: 4
Abstract
The isomerization of 2,4,6-tri-tert-butylphenyl, which occurs by quantum-mechanical tunneling of a hydrogen atom from an ortho tert-butyl group,5 occurs at the same rate in matrices as in solution. The rate of this process has been measured at temperatures down to 28 K. At such low temperatures the rate is virtually independent of temperature. Tri-tert-(perdeuteriobutyl)phenyl decays by deuterium atom tunneling at the same rate in matrices as in solution. A number of less hindered aryls decay by intermolecular hydrogen abstraction from the surrounding medium. However, octamethyloctahydroanthracen-9-yl decays by intramolecular hydrogen tunneling, even though the corresponding deuterated radical decays by reaction with the solvent. © 1978 American Chemical Society.
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LanguageEnglish
Peer reviewedYes
NPARC number21276453
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