钯/聚乙烯醇纤维膜催化水相中的Heck偶联反应  

Study on Heck reaction in aqueous solution catalyzed by Pd/PVA electrospun mat catalyst

作　　者：季伟鑫[1] 杜轶君[2] 沈德凤[1] 邵林军[2] 齐陈泽[2] 

机构地区：[1]佳木斯大学药学院,黑龙江佳木斯154007 [2]应用化学研究所,绍兴文理学院化学化工学院,浙江绍兴312000

出　　处：《化学研究与应用》2011年第9期1159-1163,共5页Chemical Research and Application

基　　金：浙江省自然科学基金(Y-4080450)

摘　　要：通过静电纺丝和热交联技术、以聚乙烯醇(PVA)作为载体制备了一种电纺纤维膜负载型钯催化剂。利用扫描电镜(SEM)、能谱仪(EDS)和X射线光电子能谱(XPS)对其进行了表征。SEM结果显示:PdCl2的加入导致PVA纤维直径增加、形貌变差,而热交联过程可以减小纤维直径、改善纤维形貌。XPS表征则表明PVA可以还原Pd2+为Pd0。催化结果显示负载型催化剂在水相中只需1/20当量就可以有效地催化丙烯酸酯与芳基碘的Heck偶联反应,较高产率地生成取代的反式肉桂酸;并且纤维膜催化剂循环使用五次后仍有良好的催化活性。A palladium catalyst supported on poly（vinyl alcohol）（PVA）electrospun mat（Pd/PVA）was prepared by electrospinning PVA and PdCl2 mixture solution in 80 vol.%acetic acid solution and then a thermal crosslinking process.Scanning electron microscopy（SEM）showed that the crossslinking process could improve the morphology and decrease the diameter of the Pd/PVA fiber.The X-ray photoelectron spectrum demonstrated that the PVA could reduce the Pd2＋ into Pd0.The cross-coupling reactions of aromatic iodides with alkenes（Heck reaction）could be effectively catalyzed by this Pd/PVA mat.Moreover,this Pd/PVA mat was easily to separate from the reaction solution and recycled for five times without obvious loss of catalytic activity.

关 键 词：静电纺 纤维 HECK反应 钯催化剂 

分 类 号：O625.12[理学—有机化学]