The Preparation And Research Of Pd@MOFs Composites And Catalysis One-pot Reaction Of Suzuki-Knoevenagel

In recent years,metal-organic frameworks?MOFs?have received increasing attention as the latest generation of porous materials.The MOFs material is a network structure formed by self-assembly of metal ions and organic ligands.The diversity of organic ligands creates a diversity of MOFs'species and function,turning it into a place in many areas.For example:gas storage and adsorption,drug delivery,heterogeneous catalysis,etc.Suzuki reaction is one of the effective methods for the industrial production of diaryl and olefin derivatives,and the reaction has now been widely used to synthesize various natural products,drugs,and conductive polymers.Knoevenagel condensation reaction is one of the important methods for producing unsaturated carbonyl compounds,and has been widely used in the synthesis of pharmaceuticals,cosmetics and biological products.Multi-step reactions take a long time and consume a lot of energy,while a one-pot reaction can achieve a sustainable process for minimizing energy consumption by avoiding intermediate separation and purification steps.Therefore,it is very desirable to develop an environmentally friendly heterogeneous catalyst to catalyze the reaction.One-pot reaction achieves a sustainable process by minimizing energy consumption by avoiding steps such as intermediate separation and purification.Therefore,this paper mainly selects various carboxylic acid ligands and various metal ions to synthesize a series of MOFs with good structural properties,and passes X-ray powder diffraction?XRD?,transmission electron microscopy?TEM?,infrared absorption spectroscopy?FT-IR?,thermogravimetric?TGA?analysis and other means to analyze and characterize the composite material,and use the composite material to catalyze the Suzuki-Knoevenagel one-pot reaction,catalytic effect is great,the experiment shows that the catalyst can be recycled and reused many times.This article is divided into four parts:The first chapter summarizes the research progress of metal-organic framework materials and composite materials,the recent development trend of one-pot reaction in synthetic chemistry,and introduces the significance of this paper.The second chapter introduces a series of MOFs materials synthesized by using various carboxylic acid ligands and various metal ions,and encapsulates Pd nanoparticles to synthesize composite materials such as Pd@MIL-101,Pd@MIL-101-NH₂,Pd@IRMOF-3,Pd@UiO-66,Pd@HKUST-1,Pd@Co₄?tpt?₂?btb?,and analyze their structures.The third chapter mainly describes the Suzuki-Knoevenagel reaction of benzene boronic acid with different functional groups at a temperature of 70 ^oC,solvent is ethanol,inorganic base is potassium carbonate and 1.0 mmol%Pd@MOFs as catalysis to catalyst one-pot Suzuki-Knoevenagel reaction of phenylboronic acid with an aldehyde group,halogenated benzene and malononitrile.Among them,Pd@MIL-101-NH₂ is a good catalytic.The fourth chapter is the summary part.The structure and catalytic performance of several composite materials are summarized in detail.