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An intramolecular cycloisomerization occurred upon adding a tertiary amine N-oxide to alkyne−cobalt complexes, derived from 3-sila 1,7-enynes and dicobalt octacarbonyl. As a result, eight-membered cyclic dienylsilanes were obtained by a regioselective insertion of the alkynyl group into the C(1)−H bond.
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Kagoshima et al. (1996) studied this question.
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