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Kinetics of the reaction of C6H5 with HBr and DBr

✍ Scribed by T. Yu; M. C. Lin

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 394 KB
Volume: 26
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550260711

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✦ Synopsis

The rate constants for the reaction of with HBr and DBr have been measured with the cavityring-down method in the temperature range of 297 to 523 K and 297 to 500 K, respectively. These rate constants can be effectively represented, in units of cm3/s, by exp[(-554 2 208)/T] and kHLlr = 10-10.40?0.24 kDBr = 10-10.36?0.17 exp[(-612 t 151)/T].

Both activation energies are similar and positive, contrary to those of alkyl radical reactions, all of which exhibit negative temperature dependencies. The difference, as pointed out before [l], could be accounted for by the electron-withdrawing effect of the phenyl vis-a-vis the electron-donating ability of the alkyls.

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