Fused bicyclic oxonium ylides, generated with catalytic Rh2(OAc)4 from cyclic ethers bearing pendant diazo ketones, undergo a [1,2]- or [2,3]-shift to give O-bridged seven- or eight-membered carbocycles, in several cases with a high degree of stereoselectivity.
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West et al. (1993) studied this question.
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