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An Evaluation of the Kinetic Data for Hydrogen Abstraction from Germanes in the Gas Phase by CF3 and C2F5 Radicals

Pieniążek M.

Polish Journal of Chemistry

2002

Vol. 76 / nr 12

1739-1746

After the review of kinetic data for reaction of hydrogen abstraction from germanoorganic compounds by trifluoromethyl and pentafluoroethyl radicals in the gas phase it was possible to determine the relative kinetic reactivity of the two radicals under consideration. The contributing factors are the thermochemical effects of the investigated reactions, steric hindrance derived mainly from the size of substrate molecules and the polar interaction between the polarized germane molecules and the radicals of different electrophilicity. The polar effects occurring in these radical reactions contribute primarily to the activation energy, but they have no significant contribution to the preexponential factor.