Triplet sensitization mechanisms and intermediates in photodecomposition of diaroyl peroxides

摘要

The　purposes of this investigation are concentrated at two points from the viewpoint of wide stages of photochemistry. One is to elucidate the mechanisms of photochemical bond cleavage and to clarity the differences among the modes of direct and sensitized photolyses, and thermolyses. The other is to clarity behavior of radicals in solution under or by photoirradiation.Diaroyl peroxides are decomposed thermally 1-5) and photochemically, 6-13, 15-29) and used as radical initiator. The diaroyl peroxides, which have π-electronic systems as chromophores, also known to be decomposed by singlet 26-28, 30) and triplet sensitization. 21-25, 27, 29) It has been claritied that there are some processes leading to he decomposition of diaroyl peroxides ･･･