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Don't slam the door! Cyclodextrins capped with an N-heterocyclic carbene (ICyDs) entrapped metal ions within their cavity through a novel set of interactions, including X⋅⋅⋅π, which enabled the cavity to be closed by ligand exchange (see scheme; Bn=benzyl). Although insulated from an electrode, the deeply buried metal ions retained catalytic activity. The cavity influenced the regio- and stereochemical outcome of the catalyzed reactions.
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Guitet et al. (2013) studied this question.
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