3 sulfony1) methylene (3), addition of 1 to varied olefins was observed.'Reactions of 1 with terminal olefins 4 (1) at reflux under nitrogen in benzene or (2) upon irradiation (400-W mercury lamp) in benzene at 20-25" C have now been found to involve directed homolytic addition to give the corresponding phenyl 1, 1, 3-tribromoalkyl sulfones (5, eq 2). Thus 2- methyl-l-butene (4a), l-octene (4b), and