Abstract: A new method for studies of T-succinimidyl (S,) radicals is described, one that makes possible the study of reactions of this radical with a variety of substrates not accessible by the use of Br2-NBS. NBS systems containing BrCC1, at mole fractions greater than 0.3 show all the characteristics we have associated with S, behavior, and they function in the presence of olefins which serve as Br2 scavengers. If CC14 is substituted for BrCCI,, ...