文献类型：期刊文献

英文题名：Coupling reactions of aromatic halides with palladium catalyst immobilized on poly(vinyl alcohol) nanofiber mats

作者：Shao, Linjun;Ji, Weixin;Dong, Pengdu;Zeng, Minfeng;Qi, Chenze[1];Zhang, Xian-Man

机构：[1]Shaoxing Univ, Inst Appl Chem, Shaoxing 312000, Zhejiang, Peoples R China; Shaoxing Univ, Dept Chem, Shaoxing 312000, Zhejiang, Peoples R China

年份：2012

卷号：413

起止页码：267

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：SCI-EXPANDED(收录号：WOS:000299981500032)、、EI(收录号：20120214676120)、Scopus(收录号：2-s2.0-84855532262)、WOS、CCR-EXPANDED(收录号：WOS:000299981500032)

基金：This work was generously supported by the Natural Science Foundation of Zhejiang Province, People's Republic of China and Shaoxing University.

语种：英文

外文关键词：Poly(vinyl alcohol) (PVA) fiber mats; Heterogeneous palladium catalyst; Ullmann homocoupling; Heck-Mizoroki and Sonogashira cross-couplings

外文摘要：Nanoporous poly(vinyl alcohol) (PVA) nanofiber mats prepared by means of electrospinning have been used for the immobilization of palladium catalyst. Thermal treatment of the palladium-loaded PVA nanofiber mats results in the cross-linking of the matrix PVA molecules as well as the reduction of the divalent palladium (Pd2+) into zerovalent palladium (Pd-0) species. The palladium oxidation states were examined by X-ray photoelectron spectroscopic (XPS) analysis. The PVA nanofiber morphology was characterized by scanning electron microscopy (SEM). The catalytic activity and recyclability of the prepared heterogeneous palladium catalysts have been evaluated for the Ullmann. Heck-Mizoroki and Sonogashira coupling reactions of aromatic halides. The large structure of the Pd/PVA nanofiber mats can greatly facilitate its separation and recycling, and the high catalytic activity and stability of the prepared Pd/PVA nanofiber mats have been attributed to the chelation of palladium species with the abundant hydroxyl functional groups on the PVA matrix surface area. (C) 2011 Elsevier B.V. All rights reserved.