Quantum mechanical tunneling hydrogen abstraction

CFjCl, CFjCl CFaCl, and CFs CFaCT and CFCl, >-i have been made, and Arrhenius parameters for the rate-determining step F + RQ - R + CIF determined the heat of this reaction was estimated for each substrate, and the values were used to calculate a large number of C—Cl, C—F, and C—C bond strengths [e.g. Z)°(CC1 F—Cl) = 300 8 kJ mol ]. Kinetic isotope effects for H-atom abstraction reactions of fluorine atom with chloroform, methane, and hydrogen have been measured the results are those expected from the differences in zero-point energies for the relevant vibrations, so H-atom transfer by quantum mechanical tunnelling is apparently unimportant. ... 

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