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Abstract Three interconnected catalytic cycles account for the title reaction catalyzed by a bimetallic aluminum(salen) complex and Bu 4 NBr. In the first, Bu 4 NBr acts as a nucleophile to activate the epoxide. In the second, Bu 3 N generated in situ serves to activate CO 2 . In the third, the aluminum(salen) complex brings the two activated species together so that the key bonds can be formed intramolecularly. magnified image
North et al. (Sat,) studied this question.
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