Determination of formation enthalpies of organic free radicals from the bond dissociation energy. 2. Halogen-substituted radicals

The enthalpies of formation (Δ Hf0) for 23 halosabstituted radicals are determined from the published data on the bond dissociation energies. The Δ Hf0 values of the corresponding molecules necessary for the calculation of Δ Hf0 of the radicals are taken from handbooks or calculated by the additive-group method. The conjugation energies of the radicals are calculated and the effect of substituents at the π-system on these values are found. The errors of determination of the found Δ Hf0 values of the radicals are estimated