Preparation Of Supported Catalysts For Platinum Group Metals Palladium And Rhodium And Their Application In Coupling Reactions

Platinum group metals are rare elements in nature,but at the same time they are also the most widely used catalyst constituent elements in the chemical industry.Forexample,the Suzuki coupling reaction has become one of the most commonly used and effective tools for constructing C-C bonds in the field of organic chemistry.Researchers can apply it to various fields such as natural product synthesis to polymer material development.The metal palladium catalyst is its most widely used catalyst.Due to its extensive application in automobile exhaust gas treatment catalysis,the current price of metal palladium has exceeded gold.Although after nearly 40 years of research,the application of homogeneous palladium catalysts in the Suzuki coupling reaction has become very mature,but due to its rarity and difficulty in separation from products for recycling,the development of highly active,recyclable precious metal catalysts Has become an important research topic.The immobilization of homogeneous palladium catalysts provides an attractive solution for it.At present,most of the preparation of immobilized catalysts is often constrained by the cost of preparation and the convenience of the synthesis method.In the first part of this paper,we mainly explored the preparation of urea-formaldehyde resin supported palladium catalyst and its application in Suzuki coupling reaction.As a new type of solid porous materials,metal organic framework materials(MOFs),compared with all the anisotropy of other immobilized materials,have completely uniform active sites and have received great attention in the field of heterogeneous catalysis.In the second part of this paper,a new class of ligands containing chiral diene for the synthesis of this type of MOF was designed based on a class of MOFs that were easily synthesized and had good stability and repeatability.It is planned to implant metal rhodium catalysts into this type of MOF materials,to prepare heterogeneous homogeneous heterogeneous chiral metal rhodium catalysts and use them for heterogeneous asymmetric catalysis research.In this paper,the key chiral diene ligands were amplified,and the synthesis of 3-type ligands was completed.In the first part,cheap urea and formaldehyde were used to prepare urea-formaldehyde resin-supported palladium catalyst.The catalytic performance and reusability of urea-formaldehyde resin-supported palladium catalyst in Suzuki coupling reaction were investigated.The study found that urea-formaldehyde resin-supported palladium catalyst had good performance.Catalytic performance,and has good substrate universality and reusability.The second part used the prepared urea-formaldehyde resin-supported catalyst to catalyze the Heck coupling reaction.The study found that the catalytic performance and reusability are very common.The second part also briefly explored the urea-formaldehyde resin-supported nickel catalyst and found that The urea-formaldehyde resin-supported nickel catalyst can also catalyze the Suzuki coupling reaction,but its catalytic performance is weaker than that of the urea-formaldehyde resin-supported palladium catalyst.In the third part,we completed the synthesis study of the scale-up process of the key skeleton of the chiral diene ligand.Through this process,a considerable amount of key intermediates were accumulated,three chiral diene ligands were designed and synthesized,And finally through the synthesis process.