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Zirconium-catalyzed cycloalumination of cycloalkadiynes assisted by Et 3 Al, subsequent treatment of the in situ generated tricyclic dialuminum compounds with BrCH 2 OMe and finally cyclopropanation of the obtained dispiro cyclopropyl dimethylene macrocarbocycles with Et 3 Al–CH 2 I 2 represents an efficient one-pot synthetic approach to prepare di- and tetraspiro...
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