RADICAL-TYPE ADDITION OF BENZYL BROMIDE TO VINYL-CHLORIDE - THE KINETICS AND ACTIVATION-ENERGY OF THE PROCESS

Radical telomerization of vinyl chloride with benzyl bromide and the c ompetitive reaction of benzyl bromide with vinyl chloride and trimethy lvinylsilane have been studied. The relative rate constant for the add ition of C6H5C.H-2 to vinyl chloride, k(rel) (with respect to trimethy lvinylsilane), is close to unity, whereas the activation energy of the addition of C6H5C.H-2 to vinyl chloride is considerably lower (by 7 k cal mol-1) than in the reaction involving trimethylvinylsilane. The po ssible fragmentation of the radical-adduct C6H5CH2CH2C.HCl was suggest ed as one of the possible reasons of underestimation of k(rel)Cl. The activation energy was estimated by the MPDO/3 method.