BROMINATION OF FLUOROALKENES PART 5.-KINETICS OF FORWARD AND REVERSE REACTIONS IN THE SYSTEM Br2+i-C3F7HHBr+i-C3F7Br

DOI: 10.1039/f19837901471

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Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1471 - 1482 (1983)

Update date:2022-08-28

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Authors:

Evans, Brian S.

Weeks, Ian

Whittle, Eric

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Article abstract of DOI:10.1039/f19837901471

The kinetics of the forward and reverse reactions in the gas-phase system have been studied.The slow steps for the forward and reverse reactions, respectively, are .The Arrhenius parameters obtained, for the range 421-534 deg C, are .The competitive brominations of mixtures of i-C3F7H+C2F5H and i-C3F7H+n-C3F7H have been studied over the ranges 249-430 and 220-402 deg C, respectively.Each system yielded Arrhenius parameters for reaction (2) which are in excellent agreement with those given above.The results lead to the following bond dissociation energies at 298 K: Attempts were made to measure D<(CF3)3C-H> using competitive photobromination and photochlorination.However, (CF3)3C-H is so unreactive that only the approximate result D<(CF3)3C-H> ca. 456 kJ mol^-1 was obtained.The trends in C-H and C-Br bond dissociation energies are compared in alkanes, fluoroalkanes and the corresponding bromides.

Full text of DOI:10.1039/f19837901471

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