International Journal of Chemical Kinetics p. 875 - 880 (1993)
Update date:2022-08-11
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Lin
Yu
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: kφ = 10-10.39±0.10 exp[-(551 ± 19)/T] cm3/s. 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.
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