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The gas phase reaction of CF3 radicals with C6F5H in the temperature range 373–658 K

✍ Scribed by S. I. Lane; E. V. Oexler; E. H. Staricco

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
371 KB
Volume
23
Category
Article
ISSN
0538-8066

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✦ Synopsis

CF3 radicals were generated by the photolysis of perfluoroacetic anhydride. In the presence

of pentafluorobenzene, the CF3 radicals react according to the following mechanism:

It was found that the addition reaction (3) becomes reversible above ca. 453 K. The addition rate parameters have been revised and they satisfactorily agree with those reported previously.

At temperatures higher than 593 K, only true H-abstraction occurs. The rate constant k~ for reaction (5) is given by:

where e = 2.303 RT kJmol-' and k, is the rate constant for combination of CF3 radicals. The reactions of CF3 with benzene and pentafluorobenzene are compared.

Experimental

Pentaf luorobenzene was obtained from PCR Research Chemicals and was distilled under vacuum. It was stored in a glass bulb and degassed by repetitive freezing and thawing before each experiment.

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