Effects of localized triplet exciton on reactivity of photoinduced omega-bond dissociation in naphthyl phenyl ketones having pi, [pi .sup.*] lowest triplet [T.sub.1] states studied by laser flash photolysis

The reactivity and mechanism of omega-bond disassociation in naphthyl phenyl ketones having a phenylthiyl moiety as a leaving group, p-(alpha-napththoyl)benzyl phenyl sulfide (NBPS) and 4-benzoyl-I-naphthylmethyl phenyl sulfide (BNMPS), in solution are explored by laser flash photolysis techniques. Both ketones underwent omega-bond cleavage of the C-S bond to release the phenyl thiyl radical at room temperature.