Ruthenium-catalyzed coupling of readily accessible 1-trimethylsilyl-1-alkyn-3-ols to allyl ethyl ether followed by in situ ketalization and Lewis-acid induced cyclization affords 1,5-oxygen-bridged eight- and nine-membered carbocycles, products which are difficult to construct with previously published strategies.
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López et al. (2002) studied this question.
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