Measurement of product [(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.
Y. Ito, H. Nishimura, H. Shimizu and T. Matsuura, J. Chem. Soc., Chem. Commun., 1983, 1110 DOI: 10.1039/C39830001110
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