Dendronized Poly(Ru-BINAP) Complexes: Highly Effective and Easily Recyclable Catalysts For Asymmetric Hydrogenation

✍ Scribed by Guo-Jun Deng; Bing Yi; Yi-Yong Huang; Wei-Jun Tang; Yan-Mei He; Qing-Hua Fan

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 113 KB
• Volume: 346
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/adsc.200404162

✦ Synopsis

Abstract

A new kind of dendronized polymeric chiral BINAP ligands has been synthesized and applied to the Ru‐catalyzed asymmetric hydrogenation of simple aryl ketones and 2‐arylacrylic acids. These dendronized poly(Ru‐BINAP) catalysts exhibited high catalytic activity and enantioselectivity, very similar to those obtained with the corresponding parent Ru(BINAP) and the Ru(BINAP)‐cored dendrimers. It was found that the pendant dendrons had a major impact on the solubility and the catalytic properties of the polymeric ligands. These polymeric catalysts could be easily recovered from the reaction solution by using solvent precipitation, and the reused catalyst showed no loss of activity or enantioselectivity.