【摘要】 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.更多还原

【Abstract】 Amino-guanidine-resin supported Pd(0) was prepared by the reaction of amino-guanidine modi- fied chloromethyl polystyrene resin with PdCl2, followed by reduction. The catalyst was characterized by FT-IR, XRD, BET, TG-DTA. The catalytic performance for the Heck reactions of various substituted aryl halides with acrylic acid or styrene was studied. Experiments indicated that the catalyst had excellent activ- ity and recycling. Aryl bromides with electron-withdrawing were converted completely within very short time (140 ℃ , 22 min). At 90 ℃ in the reaction of iodobenzene with acrylic acid, the catalyst could kept high activity at 21th run. The study on mechanism disclosed that the reaction was homogeneous catalytic reac- tion, and the palladium leaching was caused by the interaction of iodobenzene with the metal Pd(0) on sup- ported.更多还原