Electron transfer reactions of the biradicals produced in the Norrish type II process

The biradicals generated in the Norrish type II reaction are efficient electron donors. They are shown to react with a series of bipyridilium cations, pyridine derivatives, and aromatic nitro compounds. The rates of reaction follow the same trends as those observed for monoradicals. For example, the biradical from γ-methylvalerophenone reacts with benzyl viologen with k3 = 3.9 x 109 M-1s-1 and with 2,5-dinitrobenzoic acid with k3 = 7.6 x 108 M-1s-1