Catalytic Epoxidation of Olefins in Liquid Phase over Manganese Based Magnetic Nanoparticles
Epoxidation of olefins stands out a crucial class of reactions and is of great interest in academic research and industry due to production of various important fine chemicals and intermediates. Manganese complexes have potential in catalyzing epoxidation of olefins with high efficiency. Magnetic nanocatalysts have attracted significant attention for immobilizing homogeneous transition metal complex. Easy separation by external magnetic fields, nontoxic, and the core shell structure are the main advantages of the magnetic nanocatalysts over other heterogeneous catalyst. The way to functionalize the magnetic nanoparticles and to anchor homogeneous metal complex have significant effects to the catalytic performance. Therefore, a critical review of recent research progress on manganese complexes immobilization on magnetic nanoparticles for liquid phase olefin epoxidation is necessary. In this work, magnetic nanoparticles are categorized according to their preparation procedures and structures. The physical/chemical properties, catalytic performance for olefin epoxidation, reusability and plausible reaction mechanisms will be discussed, in an attempt to ravel the structure-function relationship and to guide the future study of MNPs design for olefin epoxidations.