Type II photoprocesses of phenyl ketones. Evidence for a biradical intermediate

PJ Wagner, PA Kelso, RG Zepp

Index: Wagner,P.J. et al. Journal of the American Chemical Society, 1972 , vol. 94, p. 7480 - 7488

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Citation Number: 85

Abstract

Abstract: Phenyl alkyl ketones generally undergo type I1 photoelimination and photocyclization solely from their lowest n, a* triplet states. Photolysis of p, ydiphenylbutyrophenone yields no triplet stilbene, which would be formed in a concerted elimination. It is concluded that y-hydrogen abstraction to yield a 1, 4 biradical is faster than the energetically allowed concerted elimination. It is suggested that the sequence triplet-+ ...

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