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The gas-phase kinetics of the reaction of 1,1,1-trifluoroethyl iodine with HI: The C?I bond dissocation energy in 2,2,2-trifluoroethyl iodide
Authors:E-Chung Wu  A S Rodgers
Abstract:The kinetics of the gas-phase reaction of 2,2,2-trifluoroethyl iodide with hydrogen iodide has been studied over the temperature range of 525°K to 602°K and a tenfold variation in the ratio of CF3CH2I/HI. The experimental results are in good agreement with the expected free radical-mechanism: equation image equation image equation image An analysis of the kinetic data yield: equation image equation image where θ =2.303RT in kcal/mol. If these results are combined with the assumption that E2 = 0 ± 1 kcal/mol, then one obtains DHurn:x-wiley:05388066:media:KIN550050609:tex2gif-stack-1 (CF3CH2? I) = 56.3 kcal/mol. This result may be compared with DHurn:x-wiley:05388066:media:KIN550050609:tex2gif-stack-2(CH3CH2? I) = 52.9 kcal/mol and suggests that substitution of three fluorines for hydrogen in the beta position strengthens the C? I bond slightly.
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