Abstract: The additions of alkoxy radicals generated during photolysis of various peroxides in the presence of ethylene, isobutylene, vinylidene fluoride, or 1, 3-butadiene are examined in solution by esr techniques. The tert-butoxy radical shows unusual and unique behavior among various oxygen-centered species, including methoxy, n-and isopropoxy, n-and sec- butoxy, trifluoromethoxy, trimethylsiloxy, alkoxycarboxy, and benzoyloxy radicals in (i) its ...