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以对氨基苯酚为单体,采用酶催化的模板聚合法,首先制得了直径在2μm左右的聚对氨基苯酚微球(PNP),然后通过负载-还原的方法得到聚对氨基苯酚微球负载钯配合物(Pd-PNP),利用IR,XRD,XPS,SEM,TG等手段对其进行了表征.XPS分析证实了催化剂中钯的存在,并且呈现出零价.SEM分析表明催化剂的制备过程没有破坏微球的形貌,钯团簇随机的分布在聚对氨基苯酚微球表面.Pd-PNP在无溶剂的条件下就能够有效的催化苯乙烯、丙烯酸与芳基碘的Heck反应,并且对于含有取代基的芳基溴和乙烯基化合物的反应也具有理想的催化效果.对于碘苯和丙烯酸的反应,Pd-PNP重复使用5次,产率仍然有92%,显示出了良好的重复使用性.
Using p-aminophenol as the monomer, polyp-aminophenol microspheres (PNP) with a diameter of about 2μm were prepared by enzyme-catalyzed template polymerization. Then, the p-aminophenol microspheres were loaded with palladium (Pd-PNP), and characterized by IR, XRD, XPS, SEM and TG.XPS analysis confirmed the presence of palladium in the catalyst and showed a zero-valent value.SEM analysis showed that the catalyst was prepared without The morphology of microspheres was destroyed, and the palladium clusters were randomly distributed on the surface of poly-p-aminophenol microspheres.Pd-PNP could efficiently catalyze the Heck reaction of styrene, acrylic acid and aryl iodides under solvent-free conditions, The reaction between the aryl bromide containing a substituent and the vinyl compound also had a desirable catalytic effect.For the reaction of iodobenzene and acrylic acid, the Pd-PNP was repeatedly used 5 times and the yield was still 92%, showing good reusability Sex.