The radical scavenging activity of 1,1-di( p-tolyl)ethylene (DTE) in the photoinitiated crosslinking (UV-curing) of an acrylate formulation is shown, and compared with that of methyl α-methoxyacrylate, a capto-dative substituted olefin, and methyl atropate, respectively. 2-Cyano-2-propyl radicals, thermally generated from 2,2′-azobis(2-methylpropionitrile) are also efficiently scavenged by DTE to form 1,4-dicyano-1,1,4,4-tetramethyl-2,2-di( p-tolyl)-butane.