✦ LIBER ✦

The gas-phase kinetics of the reaction of 1,1,1-trifluoroethyl iodine with HI: The CI bond dissocation energy in 2,2,2-trifluoroethyl iodide

✍ Scribed by E-Chung Wu; A. S. Rodgers

Publisher: John Wiley and Sons
Year: 1973
Tongue: English
Weight: 248 KB
Volume: 5
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550050609

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✦ Synopsis

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 CF3CHtI/HI. The experimental results are in good agreement with the expected free radical-mechanism:

An analysis of the kinetic data yield: log (k,/l. mol-' s-*) = (1 1.5 f 0.1) -(19.9 f 0.2)/6 log k2/k3 = (0.65 f 0.4) + 1.0/6 where 6 = 2.303RT in kcal/mol. If these results are combined with the assumption that E Z = 0 k 1 kcal/mol, then one obtains DHOzss (CF3CH2-I) = 56.3 kcal/mol. This result may be compared with DHo2g8 (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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