Biscyclopropanation: Dienynes containing a cyclohexadienyl unit can be converted into tetracyclo[3.3.0.02,8.04,6]octanes by treatment with an (N-heterocyclic carbene)gold catalyst. When the dienynes bear an open-chain diene instead of cyclohexadiene, open-cage compounds, with two sides missing from the cage, are obtained.
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Kim et al. (2007) studied this question.
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