期刊
TETRAHEDRON
卷 68, 期 18, 页码 3577-3584出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.03.008
关键词
Magnetic nanoparticle support; Palladium; Heterogeneous catalysts; Suzuki reaction; Heck reaction
资金
- National Natural Science Foundation of China [21072077, 20672046]
- Guangdong Natural Science Foundation [10151063201000051, 81510632010 00016]
- Guangzhou Science & Technology Project [2010Y1-C511]
- Fundamental Research Funds for the Central Universities [11611712]
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. (C) 2012 Elsevier Ltd. All rights reserved.
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