RELATIVE KINETICS OF THE RADICAL-ADDITION OF BENZYL BROMIDE TO UNSATURATED-COMPOUNDS

The relative rate constants of the addition of the C6H5CH2 radical to unsaturated compounds CH2 = CHX (X = C4H9, SiMe3, CF3, CO2Me, CN) were determined under the conditions of initiation by the Fe(CO)5 + DMF sy stem or by benzoyl peroxide. Depending on the values of the relative a ddition rate constants, the monomers can be arranged into the followin g series (X): CF3 almost-equal-to C4H9 < SiMe3 < CO2Me < CN. The relat ively nucleophilic character of the benzyl radical has been shown. It was found that under the initiation conditions by the Fe(CO)5 + DMF sy stem, the addition stage proceeds by a free radical mechanism.