Immobilized palladium on surface-modified Fe₃O₄/SiO₂ nanoparticles: as a magnetically separable and stable recyclable high-performance catalyst for聽Suzuki and Heck cross-coupling reactions

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• 作者：Qingwei Du ; Wei Zhang ; Hao Ma ; Jia Zheng ; Bo Zhou ; Yiqun Li ; ^{tlyq@jnu.edu.cn}
• 关键词：Magnetic nanoparticle support ; Palladium ; Heterogeneous catalysts ; Suzuki reaction ; Heck reaction
• 刊名：Tetrahedron
• 出版年：2012
• 期刊代码：107_00404020
• 类别：ch
• 出版时间：6 May, 2012
• 卷：68
• 期：18
• 页码：3577-3584
• 文件大小：1523 K

摘要

A palladium-based catalyst (Fe₃O₄/SiO₂/HPG-OPPh₂-PNP) supported on chlorodiphenylphosphine-functionalized magnetic nanoparticles was successfully prepared from Fe₃O₄/SiO₂ with sequential attachment of glycerol and chlorodiphenylphosphine, followed by treatment of an ethanolic solution of palladium chloride with hydrazine. The as-prepared catalyst was characterized by ICP-AES, FTIR, XRD, SEM, and TEM. The Fe₃O₄/SiO₂/HPG-OPPh₂-PNP was found as a magnetically separable and highly active catalyst for Suzuki coupling reactions of aryl iodides, bromides, and chlorides as well as Heck reactions of aryl iodides and bromides. Under appropriate conditions, all reactions afforded the desired products in moderate to excellent yields. Moreover, this catalyst can be easily recovered by using a magnetic field and directly reused for at least six cycles without significant loss of its activity.