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Reaction of 1-alkyn-5-ols with tetrahydrofuran-tungsten pentacarbonyl induces cyclization to the corresponding tungsten dihydropyranylidene carbenes. These carbenes can be converted into α-stannyl dihydropyrans upon reaction with tributyltin triflate and triethylamine. This strategy provides the first general preparation of six-membered ring oxacarbenes of the group VI metals, and a novel synthesis...
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