期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 393, 期 -, 页码 150-155出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2014.06.013
关键词
Dendronized polymer; Asymmetric catalysis; Bimetallic catalysts; Hydrogenation
资金
- National Natural Science Foundation of China [21232008, 21303128]
- Research Fund for the Doctoral Program of Higher Education of China
- Ministry of Education of China [20130143120003]
- Fundamental Research Funds for the Central Universities (WUT) [2013-IV-077]
A new kind of chiral conjugated copolymer P-2 with (S)-BINAP [BINAP = 2,2'-bis(diarylphosphino)-1,1'-binaphthyl] and fluorene as the building blocks was synthesized involving Pd[P(p-tolyl)(3)](3)-catalyzed Suzuki-coupling reaction together with reduction of phosphine oxide with HSiCl3/NEt3. The chiral polymer was used to construct chiral Ru/Ir bimetallic dendronized polymer catalysts P-5-m with different generations of Frechet-type dendritic DPEN [DPEN = 1,2-diphenylethylenediamine] ligands through a programmed metal-ligand coordination strategy. These dendronized polymer catalysts were applied to the Ir-catalyzed asymmetric hydrogenation of quinaldine and exhibited excellent activity with moderate enantioselectivity. The reaction rate was increased with increasing generation of the dendronized polymer catalysts, which are better than that obtained from the monomeric catalyst. This interesting positive dendrimer effect might be due to effective shielding of the catalytically active iridium center by the bulky dendritic pendants, which reduced the formation of the inactive iridium dimer. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据