文献类型：期刊文献

英文题名：Selective aerobic oxidation of styrene to benzaldehyde catalyzed by water-soluble palladium(II) complex in water

作者：Feng, Bo[1];Hou, Zhenshan[1];Wang, Xiangrui[1];Hu, Yu[1];Li, Huan[1];Qiao, Yunxiang[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2009

卷号：11

期号：9

起止页码：1446

外文期刊名：GREEN CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000269493700024)】；

基金：The authors are grateful for the support from the National Natural Science Foundation of China (No. 20773037), ECUST (No. YJ0142136), and the Commission of Science and Technology of Shanghai Municipality (No. 07PJ14023), China. The authors would also like to express their thanks to Prof. Walter Leitner for helpful suggestions and Dr Nils Theyssen for experimental assistance.

语种：英文

摘要：Selective oxidation of styrene to benzaldehyde has been carried out for the first time in aqueous phase by using a green and water-soluble palladium(II) complex as a catalyst under neutral, chloride and base-free conditions. The influences of reaction temperature, reaction time, palladium concentration and O-2 pressure on the conversion of styrene and the selectivity to benzaldehyde have been discussed. The reaction products, benzaldehyde, benzoic acid, acetophenone are readily isolated by ether extraction at room temperature. The water-soluble catalyst immobilized in aqueous phase can be reused for eight catalytic runs with an almost constant catalytic activity for the styrene oxidation. The influence of substituting groups in the aromatic ring of styrene on the reactivity was also discussed. Spectroscopic studies revealed that the hydrophilic dipyridyl-based ligand (L) with Pd(OAc)(2) formed a water-soluble Pd(II) complex. The UV/Vis spectra analysis further showed that the Pd(II)-L complex could serve as the catalytically active species in the present catalytic system.