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Iodo-, bromo-, chloro-etherification and oxymercuration–demercuration of hexahydropentalene 1,3-dimethanol were regioselectively realized with formation of pentalenofurane compounds in good yields. The corresponding hexahydropentaleno diacid and its monoester react regioselectively with MCPBA to give two γ-lactones. Haloetherification of the diacid also regioselectively gives halogenolactones in good...
The treatment of hexahydro-1.3-pentalenedimethanol 1 with MCPB acid gave a pentalenofurane compound 7 instead of an epoxide, in >90% yield by participation of the closer hydroxymethyl group in epoxidation. Acyl-protected derivatives 1a–1e gave a mixture of exo- and endo-epoxides 5/6 as expected, with exo-epoxides representing the major compound in all cases. The best yield for exo-epoxide was obtained...
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