Introduction Investigation of the additions of a number of substances to olefins has demonstrated that some of these additions proceed by a free radical chain reaction. Among the reactions observed, are radical-induced polymerizations or copolymerizations, and additions of the following types of atoms and free radicals ': Br-,(a) RS,(b). SCH2COOH,(c) HO&-,(dl Cl&., Br3C, ClZBrC., BrzHC.,(e) CzHbOCOCClp a,(f) Cl2P.,(g) C&Si-, ch)(C6H6), ...