Mesoporous Structure Of Organic Metal Catalyst In The Preparation And Application Of Water Medium Cleaning Organic Synthesis

The chemical industry benefit the mankind,but also bring a range ofissues, such as energy shortages, environmental pollution andecological destruction, seriously restricting the further development ofhuman society and the world economy.Green chemistry as a newconcept for the development of chemistry, has been a broadconsensus of the scientific fields, and be bound to fundamentally solvethe challenges came from the chemical industry.The development ofgreen chemistry, mainly in three aspects: the use of clean energy(microwave, solar, etc.), the use of clean solvent (water, ionic liquids,supercritical carbon dioxide), development of efficient and reusablecatalytic materials.Among them, the development and use efficientcyclic catalytic system in a cleaning solvent may be the most importantmethod.Therefore, the efficient heterogeneous catalyst for the organicreactions in the water phase are in full compliance with the principles ofgreen chemistry.The one hand, the immobilization of homogeneouscatalysts, can maintain the catalytic properties of homogeneouscatalysts, at the same time can solve the homogeneous catalystseparation from the reaction system problem, and the catalyst can bereused and reduce the heavy metal ion contamination pollution; theother hand, using the clean and easy to get water as reaction solvent,not only can the less the cost of production, but also reduce thepollution caused by organic solvents.The study of heterogeneous catalysts has made considerableprogress, but the method of separation of the catalyst, the activecomponent types and immobilized way need to further expand.Basedon the above considerations, this paper has developed a magneticmesoporous material as a carrier of heterogeneous catalysts to producta rapid magnetic separation of heterogeneous catalysts; and immobilization of rare erth organometallic as catalyst active certer onmesoporous materials for the water phase organic synthesisapplications; the same time, explore relationship between the differentcarrier functions ways and the catalytic performance.Through a fullrange of activity and structural characterization of these catalysts,analysis of their structure-activity relationship in-depth providetheoretical and practical basis for the design of new and efficientrecycle catalytic materials.The paper is divided into the following threeparts:1) The catalyst made by loading organometallic palladium on silicawrapped magnetic silica ball, then the catalyst be used in the aqueousphase Sonogashira and Suzuki reactions, the activity as high ashomogeneous catalysts, the catalyst can be fast separated by themagnet and can be reused for several times;2) The development of mesoporous silica layer wrapped iron oxideload organometallic palladium and organometallic rhodium-phasecatalyst,and the catalysts be used in Sonogashira, Suzuki and Heckreactions.After comparing the performance difference between thecatalyst with mesoporous layer and the catalyst without mesoporouslayer, the catalyst with mesoporous layer showed good catalyticactivity and recycling performance, because the silica mesoporouslayer can promote the capacity of the adsorption and enrichment ofthe substrate.At the same time, the magnetic carrier has goodmagnetic responsiveness, the catalyst can be rapid separated by amagnitic.3) The ordered mesoporous PMO (Ph) with high hydrophobicmaterial is getted by BTESB and P123synergistic self-assembly synthesis,then the PMO is sulfonated modified by using Benzenesulfonyl chloride,the sulfo group is used to load Trifluoromethane sulfonate rare earthmetals, then the catalyst is used in the aqueous Mukaiyama-aldol condensation reaction and benzaldehyde allylation reaction.Foundthat the hydrophobic surface carrier can prompt the adsorptioncapacity of the substrate, so that thev to get better performance toapply, can be reused many times, the activity remained.