论文部分内容阅读
以氨基碳酸胍改性氯球为载体,与氯化钯溶液反应并还原制备氨基胍树脂负载钯(0)催化剂.对催化剂进行了FT-IR,XRD,BET,TG-DTA表征.研究了该催化剂对各种取代卤代苯与丙烯酸、苯乙烯的Heck芳基化反应催化性能.实验结果表明,该催化剂对活性(吸电子基)溴代苯和碘苯具有良好的催化活性,对含活性吸电子基的溴代苯(4-溴苯甲醛和4-溴硝基苯)于140℃时能在22min内完成Heck芳基化反应;催化剂具有较好的重复使用性能,在90℃下催化碘苯与丙烯酸的反应循环21次时仍能保持良好的催化活性.反应机理研究表明:催化反应的活性组分是可溶性钯物种;可溶性钯是由卤代苯与催化剂表面上的钯氧化加成所致.
The catalyst was characterized by FT-IR, XRD, BET and TG-DTA with the guanidine aminocarbonate-modified chloride as the carrier and the reaction with palladium chloride solution and the reduction to prepare the aminoguanidine resin supported palladium (0) catalyst. Catalyst for Heck arylation of various substituted halobenzenes with acrylic acid and styrene.The experimental results show that the catalyst has good catalytic activity for the active (electron-withdrawing) bromobenzene and iodobenzene, Heter arylation of brominated benzene (4-bromobenzaldehyde and 4-bromonitrobenzene) with electron-withdrawing group can be completed in 22 min at 140 ℃. The catalyst has good reusability and catalytic activity at 90 ℃ The reaction of iodobenzene with acrylic acid can still maintain a good catalytic activity when cycled for 21 times.Reaction mechanism studies show that the active component of the catalytic reaction is a soluble palladium species and the soluble palladium is formed by the palladium oxidation on the surface of the halogenated benzene with the catalyst Due.