Catalysis cubed Reloaded─Cyclopropanations inside Porphyrin-Based Supramolecular M 8 L 6 Aggregates

-configured isomer was observed when the caged catalysts were used compared to their free analogues. However, internal 1,2-disubstituted alkene functions could essentially not be transformed into cyclopropanes in this confined arrangement. All of these features─the selective transformation of terminal alkenes as well as the enhanced activity of the catalyst in transformations of these substrates and the change in the stereochemical outcome of the reaction─nicely demonstrate the benefit of compartmentalization of transition metal catalysts in the unique microenvironment of a metallosupramolecular cage.