Magnetically Recoverable Nanoparticles: Highly Efficient Catalysts for Asymmetric Transfer Hydrogenation of Aromatic Ketones in Aqueous Medium
作者:Guohua Liu、Hongyuan Gu、Yunqiang Sun、Jie Long、Yulong Xu、Hexing Li
DOI:10.1002/adsc.201100017
日期:2011.5
Two magnetic chiral iridium and rhodium catalysts were prepared via directly postgrafting 1,2‐diphenylethylenediamine‐derived organic silica or 1,2‐cyclohexanediamine‐derived organic silica onto the silica‐coated iron oxide nanoparticles followed by complexation with iridium(III) or rhodium(III) complexes. During the asymmetric transfer hydrogenation of aromatic ketones in aqueous medium, the magnetic
两种磁性手性铱和铑催化剂是通过将1,2-二苯基乙二胺衍生的有机二氧化硅或1,2-环己二胺衍生的有机二氧化硅直接后接枝到二氧化硅包覆的氧化铁纳米粒子上,然后与铱(III)或铑( III)配合物。在水性介质中芳族酮的不对称转移加氢过程中,磁性手性催化剂表现出高催化活性(高达99%转化率)和对映选择性(高达92%ee)。两种催化剂都可以通过磁分离容易地回收,并且可以重复使用十次,而不会显着影响它们的催化活性和对映选择性。