The gas‐phase kinetics of the reaction of 1,1‐difluoroiodoethane with hydrogen iodide: The C–I bond dissociation energy in 1,1‐difluoroiodoethane

The kinetics of gas‐phase reaction of CH3CF2I with HI were studied from 496 to 549K and have been shown to be consistent with the following mechanism: equation image A least squares treatment of the data gave where θ = 2.303 RT kcal/mole. The observed activation energy E1 was combined with E2 = 0 ± 1 kcal/mole to yield The result, combined with data for several CI bond dissociation energies, leads us to conclude that the C(sp3)I bond is relatively insensitive to F for H substitution and that the C(sp2)–I bond has considerable double‐bond character.