ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Calculations were carried out on several data sets to study the mechanism of hydrogen abstraction from phenols by peroxy radicals: Rate constants, k values, were collected for the reactions of cumyl-, 1-phenylethyl- and tert-butyl-peroxy radicals with ortho-para-substituted phenol inhibitors. The rate constants were recalculated for the same temperature. Solvent effects were neglected because the solvents used were similar in nature. The phenol ortho substituents were characterized by an indicator variable ItBu accounting for the presence or absence of di-tert-butyl groups. The phenol para substituents were characterized by Charton's σI, σR, and σR+ substituent constants.The dependence of log k values on Itbu, σI, σR, σR+ was investigated using stepwise linear regression analysis. The combined data set of 32 reactions gives: \documentclass{article}\pagestyle{empty}\begin{document}$$\log \,\,k_{(333{\rm K)}} = - 0.801\sigma _I - 2.483\sigma _{\rm R} + 3.766\,\,\,\,\,\,\,\,\,(r = 0.851)$$\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$$\log \,\,k_{(333{\rm K)}} = - 0.932\sigma _1 - 2.302\sigma _R^ + + 3.802\,\,\,\,\,\,\,\,\,(r = 0.848)$$\end{document}The results suggest that hydrogen abstraction from phenols by peroxy radicals proceeds by an electrophilic mechanism, and that neither the peroxy-radical nor the ortho-di-tert-butyl groups have considerable effect on the rate of reaction (1).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550211211
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