[(4) and (5)] quantum yields indicated that reactions of molecular oxygen with diradicals photogenerated from 2,4,6-tri-isopropylbenzophenones (3a–e) were accelerated by the presence of both electron-donating (OMe and Me) and electron-withdrawing (Cl and CF3) substituents, this acceleration probably resulted from the zwitterionic nature of the diradicals.
产物[(4)和(5)]量子产率的测量表明,分子氧与由2,4,6-
三异丙基二苯甲酮(3a - e)光生的双自由基的反应都通过电子给体(OMe)的存在而加速。和Me)以及吸电子(Cl和CF 3)取代基,这种加速可能是由于双自由基的两性离子性质所致。