Preparation Of Supported Metal Catalysts And Asymmetric Michael Addition And Hydrogen Transfer Reaction Studies

Heterogenous catalysts have not only solved problems of recycling but alsoovercomed the issues of environmental polution.The great perspective of this kind ofcatalyst caught many scientists’ eyes.In the area of multiphase reaction, carbon materials and silica materials havealways been playing crucial roles. Mesoporous organic and inorganic silica complexmaterial has the organic groups in its structure which can enhance the strength ofthem. Meanwhile, this kind of material has hydrophobic propertie which is benefit tothe reaction. The organic groups are well separated in the material, which make thepore big enough to take reaction, enhance the surface areas and accelerate thespeed of the reaction. Furthermore, the material holds great mechanical stability andhydrothermal stabilities. All these make it easy to recycle and reused the catalyst.The graphite oxide is one kind of the carbon materials. It holds unified structure,abundant active groups such as hydroxyl and carboxyl which can be easilyfunctionalized, hydrophobic surface which can accelerate the speed of the reaction.Therefore, the graphite oxide has been widely used as an immobilization material.We chose graphite oxide and silica as our immobilization materials, then, wemodified the materials with Nichel and Rhodium metals to get the target catalysts.After making the catalysts, we made a serious of discussion about their properties.This thesis is mainly divided into the following three parts.(1) Self-assembled3D flowerlike material for asymmetric Michael Addition of1,3-dicarbonyl compounds to nitroalkenes We used Nickel compounds co-ordinate(1R,2R)-1,2-diaminocyclohexane to get the metal catalyst, finally We Synthesisheterogeneous catalyst, and test the catalyst in the asymmetric Michael addition of1,3-dicarbonyl compounds to nitroalkenes under the toluene system. The resultshowed that the catalyst has a high effect.(2) Functionilized periodic mesoporous organosilica: a highly enantioselectivecatalyst for Michael Addition of1,3-dicarbonyl compounds to nitroalkenes. We usedthe functionalized PMOs under the guide of template to get the mesoporous silica oxide material. Then, we let it coordinate with the (1R,2R)-N,N′-dibenzylcyclohexyldiamine to got the target catalyst. We used the catalyst in the asymmetricMichael addition under the toluene system. The result showed that the catalyst hasan excellent reactive and enantioselective effect. Moreover, the catalyst can bereused nine times and still keep the high effect.(3) Graphene oxide based chiral diamine Rhodium catalyst for asymmetrictransfer hydrogenation of aromatic ketones. In the last part of the paper, We usedthe Hummer chemical mothed to get the graphite oxide and modified it with theTS-DPEN. Afterwards, we let it coordinate with [Cp*RhCl2]2. At last, we got thecatalysts Cp*RhTsDPEN@graphite oxide. We used this catalyst in aromatic ketoneasymmetric hydrogen transfer reaction in HcooNa system and gained excellent effect.