Study On Heck Tandem Reaction Catalyzed By Pd@MOFs Composite

Metal-organic frameworks(MOFs)assembled from metal ions or clusters through coordination bonds and organic ligands are new three-dimensional organic-inorganic composites with highly porous nanostructures.People use metal clusters or rare earth metals,transition metals,and lanthanides as the central site of the framework and the earlier nitrogen-containing organics have gradually expanded to organics with rigid structures.Various metal-organic frameworks have been developed.The combination of metals and organics has changed.As an emerging category of crystalline porous materials,it has many fascinating advantages,such as achievable high surface,diversified structures and strategies,controllable structure,chemical stability,and orderly structure,making MOFs new Category,porous materials with high surface area,especially porosity,adjustable pore structure,easy functionalization and more chelating sites,so that it can be widely used for gas storage and separation,energy storage and conversion,metal ions Sensing,drug delivery,catalysis,sensors.In order to truly reduce energy emissions and consumption,MOFs catalysts with dual functions have been developed with high selectivity and maximum atomic efficiency,and as a new member in the field of catalysts,they have proven to have great potential.MOFs have proved that they have become a hot spot as heterogeneous catalysts,especially as carriers of metal nanoparticles.Although a large number of studies on the role of MOFSs in catalysis have been conducted,the number of studies on bifunctional metal nanoparticles @MOFs for catalyzing one-pot reactions is limited.A dual-functional Pd@MOFs composite material has been developed to catalyze the tandem reaction with a one-pot heterogeneous catalyst.The catalyst has no activity loss after several cycles of use,and can be reused,saving costs.The metal nanoparticle@MOFs composite material as a bifunctional catalyst has been proved to have good catalytic activity in catalyzing the Heck reaction,the Heck-Knoevenagel tandem reaction,and the Heck-amination tandem reaction.The first part mainly introduces the introduction and application of metal organic framework materials and metal nano-particles supported metal organic framework,as well as an introduction to the synthesis method.The second part focuses on the synthesis and characterization of metal nanoparticle composite materials.The third part is mainly about the catalysis of Pd@MOFs composite materials for the Heck-Knoevenagel tandem reaction.The fourth part is mainly the exploration of different tandem reactions of Pd@MOFs composite materials.The fifth part is mainly a summary of the conclusions of the first four parts and prospects for the future development of the metal organic framework.