Simply Modified Chiral Diphosphine: Catalyst Recycling via Non‐covalent Absorption on Carbon Nanotubes

A new type of recyclable chiral catalyst system was developed by absorption of pyrene‐modified Pyrphos rhodium catalyst onto carbon nanotubes via π‐π stacking interaction. This modified catalyst was successfully applied in the asymmetric hydrogenation of α‐dehydroamino esters for nine cycles without obvious deterioration of activity and enantioselectivity.