Kinetic applications of electron paramagnetic resonance spectroscopy. VII. Self-reactions of iminoxy radicals

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DOIResolve DOI: http://doi.org/10.1021/ja00775a030
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TypeArticle
Journal titleJournal of the American Chemical Society
ISSN0002-7863
Volume94
Issue20
Pages70407049; # of pages: 10
AbstractThe silver oxide oxidations of a number of oximes in benzene solution have been examined. The reaction probably involves the intermediate formation of iminoxy radicals. Rather complex mixtures of products are generally produced because of the instability of some of the initially formed iminoxy radical dimers. Iminoxy radicals can dimerize by N-N, N-O, and O-C coupling. The kinetics and rate constants for the decay of a wide variety of photochemically generated iminoxy radicals have been measured by epr spectroscopy. Under the conditions of the decay experiments the radicals are in equilibrium with "unstable" dimers. For unhindered dialkyliminoxy radicals the equilibrium is rapidly established and lies in favor of the dimers. Decay is first order. For the majority of diaryliminoxy, alkylaryliminoxy, and hindered dialkyliminoxy radicals the equilibrium favors the radicals or else is only slowly established and decay is second order. A unified reaction scheme is proposed but in view of the complexities of the iminoxy radical self-reactions the precise interpretation of the measured decay rate constants and activation parameters is uncertain.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21276490
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Record identifier2b31197f-52e6-418f-beb6-2c4ea94ec38c
Record created2015-10-13
Record modified2016-05-09
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