Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 352, Issue 14-15, Pages 2497-2506Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201000340
Keywords
asymmetric catalysis; asymmetric transfer hydrogenation; immobilization; recycling; rhodium; supported catalysts
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [EXC 314]
- Berlin Senate Department of Science, Research, and Culture
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Catalyst immobilization through covalent attachment onto a support is one strategy to provide recyclable systems. Here, soluble and surface-functionalized solid polymers were used as supports for a modified tethered rhodium(III)-p-toluenesulfonyl-1,2-diphenylethylenediamine [Rh(III)-TsDPEN] complex. The supported catalysts were applied to the asymmetric transfer hydrogenation of phenyl ketones in aqueous solution of sodium formate. High ee values (up to 99%) and good activities were achieved. It was discovered that the solid polymer-supported catalyst could be recycled at least four times without a significant decrease of the activity when a mixture of sodium formate and formic acid was used as the hydrogen source. This catalytic system provides a promising approach towards an ecologically and economically rational production of enantioenriched building blocks.
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