6,7-Dioxabicyclo [3.2.1]octane has been prepared from its cis-8-bromo derivative by reduction with tributyltin hydride generated in situ from bis(tributyltin) oxide and polymethylhydrogen siloxane; analogous reactions have afforded 7,8-dioxabicyclo[4.2.1]nonane and 8,9-dioxabicyclo[5.2.1]decane.
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