Cooperative NHC‐based Catalytic System Immobilised onto Carbon Materials for the Cycloaddition of CO<sub>2</sub> to Epoxides
Myriam Y. Souleymanou, Fatima El‐Ouahabi, Anna M. Masdeu‐Bultó, Cyril Godard
Abstract
Abstract New pyrene‐tagged imidazolium salts and their corresponding carboxylates were synthesised and the latter tested as organocatalysts in the cycloaddition of CO 2 with epoxides. The best performing organocatalyst was then non‐covalently immobilised onto carbon materials (carbon nanotubes (CNTs), reduced graphene oxide (rGO) and carbon beads (CBs)) via π‐π stacking interactions and their activity and recoverability in the cycloaddition reaction were studied. The heterogenised catalyst onto reduced graphene oxide ( 4 a @rGO) was recycled several times although a loss of activity was observed. This catalyst was also used for the transformation of a series of epoxides under mild conditions.