Poly(2,2′-Bibenzimidazole)–Supported Iridium Complex: A Recyclable Metal–Polymer Ligand Bifunctional Catalyst for the <i>N</i>-Methylation of Amines with Methanol
Beixuan Dong, Xingliang Wu, Lu Shen, Yiqian He, Xiaozhong Chen, Shouhai Zhang, Feng Li
Abstract
The design and development of new types of catalysts is one of the most important topics for modern chemistry. Herein, a polymer-supported iridium complex Cp*Ir@Poly(2,2′-BiBzIm) was designed and synthesized by the coordinative immobilization of [Cp*IrCl 2 ] 2 on 2,2′-bibenzimidazoles. In the presence of the catalyst (0.5 mol % Ir) and Cs 2 CO 3 (0.3 equiv), a variety of N -methylated amines were obtained in high yields with complete selectivity. More importantly, the catalyst could be recycled without an obvious loss of activity for six cycles. Apparently, the designed catalyst combines the advantages of both homogeneous and heterogeneous catalysis.
Topics & Concepts
ChemistryIridiumBifunctionalCatalysisMethanolLigand (biochemistry)Combinatorial chemistryPolymerMetalPolymer chemistryOrganic chemistryReceptorBiochemistryAsymmetric Hydrogenation and CatalysisCarbon dioxide utilization in catalysisNanomaterials for catalytic reactions