Chiral Chromium Salen@rGO as Multipurpose and Recyclable Heterogeneous Catalyst

The first immobilization of a pyrene-tagged chromium salen complex through π-π noncovalent interactions on reduced graphene oxide (rGO) is described. A very robust supported catalytic system obtained to promote asymmetric catalysis in repeated cycles, without loss activity or enantioselectivity. This specific behavior was demonstrated two different reactions (up ten reuses) promoted by complexes, the cyclohexene ring-opening reaction and hetero-Diels-Alder cycloaddition between various aldehydes Danishefsky's diene. Furthermore, chiral salen@rGO has been found be compatible with multi-substrate type use, which structure substrate involved modified each time catalyst reused.