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Kinetics of the reaction of C 6 H 5 with HBr
Author(s) -
Lin M. C.,
Yu T.
Publication year - 1993
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550251008
Subject(s) - chemistry , arrhenius equation , radical , hydrogen atom abstraction , hydrogen atom , reaction rate constant , hydrogen bromide , alkyl , kinetics , bromide , medicinal chemistry , hydrogen , photochemistry , ring (chemistry) , bromine , organic chemistry , activation energy , physics , quantum mechanics
The rate constant for the reaction of phenyl radical with hydrogen bromide has been measured with the cavity‐ring‐down method at six temperatures between 297 and 523 K. The Arrhenius expression for the H abstraction reaction can be effectively given by:\documentclass{article}\pagestyle{empty}\begin{document}$$ k_\phi = 10^{ - 10.39 \pm 0.10} {\rm exp[-(551} \pm {\rm 19 +)/T]cm}^{\rm 3} /{\rm s} $$\end{document} . The values of these parameters are similar to those for the H + HBr reaction, but are in sharp contrast to those for alkyl radical reactions. The gross difference between the alkyl radical reactions and the phenyl and H‐atom reactions could be rationalized in terms of the inductive effects of these radicals as measured by Taft's σ* (polar) constants. © 1993 John Wiley & Sons, Inc.