Reactions of trifluoromethyl radicals with organic halides. Part 5.—Fluoromethanes and fluoroethanes
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 662-672
- https://doi.org/10.1039/tf9676300662
Abstract
Hexafluoroacetone has been photolyzed in the presence of CH4, CH3F, CH2F2, CF3CH3, CF2HCF2H and CF3CF2H. Arrhenius parameters are obtained for the abstraction of H by CF3 radicals using the combination of CF3 radicals as a reference reaction. Results were checked by photolysis of hexafluoroacetone in the presence of CD4 plus each of the fluoroethanes and CH4 in turn and using the reaction, CF3+CD4→CF3D+CD3, as a reference. The activation energies obtained are compared with those for related series involving abstraction of H by CF3 and CH3 radicals and by bromine atoms. The secondary products of the system CF3+CH2F2 have been measured. For the combination and cross-combination reactions of CF3 and CHF2 radicals, we obtain ϕ= 2.4 independent of temperature in the range 291–363°C. It is concluded that the second of the reactions [graphic omitted] occurs to a negligible extent.Keywords
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