Tandem bicycle: A gold-catalyzed geminal carbo-functionalization reaction of 3-siloxy-1,3-dien-8-ynes proceeded smoothly to give bicyclo[4.3.0]nonanes stereoselectively through ring expansion of the bicyclic carbene complex intermediates. The product configuration was different from that of the thermal Diels–Alder adduct.
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Kusama et al. (2010) studied this question.
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