Proton-Transfer Reactions. 4. Near-Unity Kinetic Isotope Effects for Hydron Exchange and Dehydrofluorination Reactions
Rates and isotope effects are reported for benzylic hydron exchange and dehydrofluorination reactions of C6H5CiHClCF3 (I) and C6H5CiH(CF3)2 (II) in alcoholic sodium alkoxide solutions.Reactions of I were studied in ethanol and isotop
MECHANISMS OF FREE-RADICAL REACTIONS. XIII. MECHANISM AND SELECTIVITY OF THE FREE-RADICAL HALOGENATION OF ALKYL AROMATIC HYDROCARBONS WITH FLUOROALKYL SUBSTITUENTS
The free-radical chlorination and bromination of 1-fluoro-2-arylethanes and 1,1,1-trifluoro-2-arylethanes was studied by the method of competing reactions.In all cases a good correalation between log krel and the Brown ?+ constants was observed.The variation of the selectivity in the transition from one reaction series to the other indicates that two independent factors which determine the reactivity (the change in the dissociation energy of the C-H bond and the polar effect of the substituents) have a simultaneous effect.
Dneprovskii, A. S.,Eliseenkov, E. V.,Mil'tsov, S. A.
p. 317 - 324
(2007/10/02)
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