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Kinetics of the reaction of C6H5 with HBr

✍ Scribed by M. C. Lin; T. Yu

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 308 KB
Volume: 25
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550251008

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✦ Synopsis

The rate constant for the reaction of phenyl radical with hydrogen bromide has been measured with the cavity-ring-down method a t six temperatures between 297 and 523 K. The Arrhenius expression for the H abstraction reaction can be effectively given by: k4 = 10-10.3950.10 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 Taws (T* (polar) constants.

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