Simply Modified Chiral Diphosphine: Catalyst Recyclingvia 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.