✦ LIBER ✦

Kinetics of the reaction F + 1,2-dibromo-1,1,2-trifluoroethane

✍ Scribed by Wendell Forst; Harold Pavaday

Publisher: John Wiley and Sons
Year: 1983
Tongue: English
Weight: 612 KB
Volume: 15
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550150905

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✦ Synopsis

The title reaction was studied in a standard flow system with F atoms produced by R F discharge in FZ-He mixture. Analysis was by gas chromatography using electron capture detection. There were two major products, identified as CFZBrCFzH and CFZBrCFzBr, plus presumably HF which was not detectable. The overall rate of disappearance of reactant was found to be of mixed one and one-half order, indicating a complex reaction. A mechanism is proposed comprising six steps and involving two radical species CFZBrCFBr (R1) and CFzBrCFZ. The 300 K rate constant for the initial step F + reactant -HF + R1 is evaluated to be 2.2 X cm3/molec.s, which fits in with rates of other saturated hydrocarbon reactants containing one hydrogen atom, thus supporting the view that in this class of reactants the rates of reactions of the type F + saturated hydrocarbon depend mainly on the number of hydrogen atoms in the reactant.

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