... The Chemical Society of Japan 1984 AN EFFECT OF TRIFLUOROMETHYL GROUP ON PHOTOSENSITIZING BEHAVIOR OF BENZOPHENONE DERIVATIVES Keisuke TAKUMA, Tokiya KIMURA, † Takaaki SONODA, and Hiroshi KOBAYASHI* Research Institute of Industrial Science, Kyushu University 39, Kasuga 816 † Department of Molecular Science and Technology, ... 884 Chemistry Letters, 1984 quantum yield, (D, of the reaction was given by Eq. ...