Treatment of some cyclic olefins and allylbenzene with Rh2(OAc)4 in acetic acid in the presence of t-BuOOH gave the corresponding enones and allylic acetates, the former being predominant. Application to several styrene derivatives resulted in a selective C=C bond fission to give benzaldehyde or acetophenone. It is suggested that the reaction proceeds catalytically with Rh(II) acetate via an ionic pathway.
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Uemura et al. (1982) studied this question.
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