Valmet Chiral Schiff‐Base Ligands And Their Copper(II) Complexes as Organo, Homogeneous and Heterogeneous Catalysts for Henry, Cyanosilylation and Aldol Coupling Reactions

Cyanosilylation, aldol coupling and asymmetric Henry reactions were carried out with L- D-valmet ligands in different configurations: i) coordinated to sodium ions, as organocatalysts, week base properties, ii) complexes copper(II), homogeneous catalysts, iii) immobilized copper(II) onto graphene oxide (GO) heterogeneous catalysts. For the reaction of benzaldehyde nitromethane water these afforded an reaction, a spectacular increase conversion ee (92.5 95.8 %, respectively) after deposition on GO. Ligand complexed copper was also effective for cyanosilylation Aldol reaction.