Recent Progress in Polymeric Palladium Catalysts for Organic Synthesis

Recent progress in the design, preparation, and application of polymer-supported palladium complexes is reviewed. In particular, the preparation of various supported palladium-phosphine complexes used in a variety of carbon–carbon bond forming reactions such as the Heck reaction, the Suzuki–Miyaura coupling, and π-allylic substitution is discussed. Immobilization of the palladium complexes has often been achieved by anchoring phosphorus-based ligands on functionalized polymer supports via covalent bonding, and subsequent complexation of the anchored ligands with palladium precursors. Encapsulation of palladium catalysts in polymer supports and immobilized chiral palladium catalysts are also introduced. Heterogeneous catalytic asymmetric carbon–carbon bond forming reactions with high stereoselectivity have likewise been achieved using polymeric chiral palladium complexes.