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

DOI	Resolve DOI: https://doi.org/10.1021/ja00481a031
Author	Search for: Brunton, G.¹; Search for: Gray, J.A.; Search for: Griller, D.¹; Search for: Barclay, L.R.C.; Search for: Ingold, K. U.¹
Name affiliation	National Research Council of Canada
Format	Text, Article
Journal title	Journal of the American Chemical Society
ISSN	0002-7863
Volume	100
Issue	13
Pages	4197–4200
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.
Publication date	1978
Language	English
Peer reviewed	Yes
NPARC number	21276453
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Record identifier	2334db41-32d2-43d4-b5bc-b2710c3adf7d
Record created	2015-10-13
Record modified	2020-03-13