Rate of addition of bromine atoms to ethylene

Abstract

The rate of combination of bromine atoms in the photosensitized hydrobromination of ethylene has been determined by the rotating sector technique. From rhis and kinetic data reported previously the rate constant for the addition of bromine atoms to ethylene in the presence of 380 Tprr of propane as deactivating gas has been calculated to be 1.5 + 0.3 x 10-l4 cm3 molecule-' s-, independent of temperature in the range 15 to 35 "C. This result is discussed and compared with rate constants for other addition reactions to ethylene.