Shell-type Ruthenium Catalysts Are Used To Study The Asymmetric Reduction Of Ketones

The multi-phase catalyst has solved the problem of recycling and utilization of homogeneous catalysts,and it has overcome the problems of difficult separation of catalysts and products,and it also has overcome the problems of environmental pollution.So it shows a certain industrial application prospect.Therefore,it has aroused great interest among researchers.The mesoporous mesoporous silicon materials,which are used in heterogeneous catalytic reactions,has easy synthesis and functionalization,it also has relatively short mesoporous cavity and special silicate cavity.There is a potential confinement effect that enhances the stereoselectivity of enantiomers.The ordered mesoporous silicone material has a large ratio of surface area and pore volume,controlled pore size and ordered pore distribution.Meanwhile the thermodynamic and mechanical stability of it is higher than other materials.It also has very high hydrophobic.The inner surface of their inner silicone promotes the transformation of organic functional groups.In this paper,we used silicon as the carrier load of homogeneous catalyst to prepare the supported catalyst,and then studied and discussed the catalytic performance of the catalyst.This thesis is divided into the following two parts:?1?A new method is used to synthesize a mesoporous silica material,and the chiral organic metal iridium group and the functionalized peg-peos eggshell structure were assembled together to synthesize Cp*Irpfpsdpen-functionalization homogeneous catalyst in the water phase catalyzing the alpha-cyanogen and alpha-nitro to replace the aromatic ketone.The catalyst showed the characteristics of the highly active,both reactivity and enantiomer stereoselectivity are higher than the homogeneous catalyst,more importantly,the method used here can be extended to other asymmetric machinist compounds synthesis.?2?The phenolic resin as the shell to be coated in the silica sphere's surface,it is called the Sto ber method,and then a hollow eggshell type carbon coated silicon ball?hereinafter referred to as the carbon package silicon sphere?formed in the atmosphere of N₂,this method has aroused the interest of researchers in recent years.This carbon coated silica sphere has great potential value in adsorption gas,energy storage,catalysis and so on.We use diphenol and formaldehyde as hard templates,then the mesoporous silicon carbide materials were synthesized by hard template method.Afterpartialetchingofthematerial,thesynthesisofCp*irpfpsdpen-functionalized homogeneous catalyst by ion pair method was used to catalyze the synthesis of p-cyanine and ala-nitro in aqueous phase.Because of its strong hydrophobicity,it is easy to separate from the reaction system and can achieve good recycling effect.