sulfuryl dichloride; 2,2'-azo-bisisobutyronitrile in benzene T=40°C; Irradiationrelative rate const. to m-ClC6H4CH2CH2F ; correlation between log k and Brown's const.;Cl2 as reagent; the method of competing reaction;; Product distribution;

sulfuryl dichloride; 2,2'-azo-bisisobutyronitrile in benzene T=60 - 70°C; Irradiation; Rate constant;