Abstract
AbstractBy photolyzing (CF2H)2CO and (CFH2)2CO the hydrogen atom abstraction reactions of CF2H radicals with (CF2H)2CO, H2, D2, CH4, C2H6, nC4H10 and isoC4H10, and the reactions of CFH2 radicals with (CFH2)2CO and nC4H10, have been studied. Arrhenius parameters for these reactions are compared with related systems. From a knowledge of the activation energies for the forward and reverse reactions a value of the bond dissociation energy, D(CF2HH) = 97.4 ± 1.3 kcal mole−1 at a mean temperature of 543°K is equation image obtained. This value is subject to much uncertainty due to possible compensation effects in the Arrhenius parameters. These effects are discussed for this and the other reactions, and the data suggest that D(CF2HH) is approximately 100 kcal mole−1, and that D(CFH2H) is very similar. Other literature data tend to confirm these approximate values.
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