Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14733
Title: A highly effective water-soluble polymer-supported catalyst for the two-phase asymmetric hydrogenation: Preparation and use of a PEG-bound BINAP ligand
Authors: Fan, QH
Deng, GJ
Chen, XM
Xie, WC
Jiang, DZ
Liu, DS
Chan, ASC
Keywords: Amphiphile
Asymmetric hydrogenation
Phosphine
Polymer-supported catalyst
Water-soluble catalyst
Issue Date: 2000
Publisher: Elsevier Science Bv
Source: Journal of molecular catalysis a : chemical, 2000, v. 159, no. 1, p. 37-43 How to cite?
Journal: Journal of Molecular Catalysis A: Chemical 
Abstract: A new type of amphiphilic PEG-bound BINAP ligand was synthesized through polycondensation of 5,5'-diamino BINAP (1), polyethylene glycol and terephthalyol chloride in the presence of pyridine. It was proven that ruthenium complex based on the new polymeric ligand was an effective catalyst for the asymmetric hydrogenation of prochiral α,β-unsaturated carboxylic acids in both ethyl acetate/water two-phase and in methanolic solvent systems. The activity and/or enantioselectivity in two-phase systems were observed to be higher than that in ethyl acetate or methanol-water homogeneous systems. The replacement of water with ethylene glycol increased the activity and enantioselectivity. The activity of the new catalyst was shown to be about 30 times higher in the two-phase hydrogenation of 2-(6'-methoxy-2'-naphthyl)-acrylic acid than the Ru(BINAP-4SO 3Na) catalyst without the long hydrophilic polymer chain, which illustrated the importance of the amphiphilic structure of the polymeric ligand.
URI: http://hdl.handle.net/10397/14733
ISSN: 1381-1169
DOI: 10.1016/S1381-1169(00)00168-0
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