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MCM-41负载芳基肟钯催化剂的制备与催化Suzuki芳基偶联反应
【作者】 张井峰；
【导师】 白雪峰；
【作者基本信息】 黑龙江大学 ， 工业催化， 2011， 硕士
【摘要】 芳基卤代烃与苯基硼酸的Suzuki偶联反应是构建联苯单元的重要方法,已在发光材料制备、药物合成等方面得到了应用。均相Suzuki偶联反应催化剂尽管反应活性高,但在反应完成后,难于回收和循环使用,并可能对产品产生污染,制备高活性、可循环使用的固载型钯催化剂,对Suzuki偶联反应的应用非常重要。采用硅烷偶联剂γ-缩水甘油醚氧丙基三甲氧基硅烷（KH560）修饰MCM-41表面的方法,合成了MCM-41@KH56表面富含环氧官能团载体,再将活性组分4-羟基苯乙酮环肟钯与MCM-41@KH560表面的端位环氧基团反应,制备出MCM-41负载4-羟基苯乙酮肟环钯催化剂;将4-羟基-3-甲氧基-苯乙酮肟与MCM-41@KH560表面的端位环氧基团作用,再通过负载钯制备出MCM-41负载4-羟基-3-甲氧基-苯乙酮肟环钯催化剂。采用热重TG、傅立叶红外FT-IR、扫描电镜SEM、N2物理吸附BET、电感耦合等离子体原子发射光谱ICP-AES等分析表征方法,对制备的负载型钯配体催化剂制备过程的结构特征和热学稳定性能进行了表征。证实了合成的钯配体催化剂是通过化学接枝的方法固载到MCM-41分子筛表面,同时保留了分子筛的部分孔结构特征,测得了钯负载量。选择了不同取代基的芳基卤代烃与苯硼酸,对制备的催化剂催化Suzuki偶联反应进行了研究,并对溶剂体系、碱以及催化剂用量等反应参数进行了优化,确定了最适宜的Suzuki偶联反应的催化反应体系,考察了负载型钯配体催化剂循环使用情况。实验结果表明,MCM-41负载肟环钯催化剂具有很好的催化活性,MCM-41负载4-羟基苯乙酮肟环钯催化剂的最佳催化体系是碳酸钾为碱,异丙醇-水（5:1）为溶剂,反应温度40℃。在最佳的体系中可有效催化芳基溴苯与苯硼酸的Suzuki偶联反应。
【Abstract】 Suzuki coupling reaction which aryl halogenated react with phenyl boronic acid is an important method to construct biphenyl unit, has been used to prepare the light-emitting materials, drug synthesis and other aspects. Although homogeneous catalysts have high activity in Suzuki coupling reaction, but it is very difficult to recovery or recycles after the reaction over, at the same time, product may be contaminated from catalyst .So, preparing highly active, reusable and immobilized palladium catalyst is mainly topic in Suzuki coupling reaction.MCM-41 loading 4-hydroxyacetophonene oxime cyclopalladium catalyst is prepared by the method of modifying MCM-41 surface with KH560 reagent. The catalysts are characterized by Thermo gravimetric Analysis （TG）, Fourier Transform Infrared Spectroscopy （FT-IR）, Scanning Electron Microscope （SEM）, N2 Absorp- tion （BET）, inductively coupled plasma Atomic Emission Spectrometry （AES-ICP）. These analysis methods shows that the synthesized MCM-41 covering oxime ligand cyclopalladium catalyst is joined chemical grafting immobilization into the surface of MCM-41, while retaining some of the molecular sieve pore structure characteristics, at same time, the prepared catalyst had been measured the amount of palladium.For studying the catalysts activity, different subsistent aryl halogenated are selected as the substrate with phenylboronic acid in Suzuki coupling reaction. The effects of solvents, bases and the amount of catalyst are tested as the mainly parameters. For the MCM-41 loading 4-hydroxyacetophonene oxime cyclopalladium catalyst, Suzuki coupling reaction condition were optimized to determine the most appropriate reaction system, the results shows that K2CO3 is the most appropriate base,ethanol-H2O（5:1） is the most appropriate solvent and 40℃is the most appropriate temperature.