| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1347574 | Tetrahedron: Asymmetry | 2009 | 7 Pages |
Abstract
Two mesoporous silica-supported chiral Rh and Ru catalysts 5 and 6 with ordered two-dimensional hexagonal mesostructures were prepared by directly postgrafting organometallic complexes RhCl[(R)-MonoPhos(CH2)3Si(OMe)3][(R,R)-DPEN] and RuCl2[(R)-MonoPhos(CH2)3Si(OMe)3][(R,R)-DPEN] (DPENÂ =Â 1,2-diphenylethylenediamine) on SBA-15. During the asymmetric hydrogenation of various aromatic ketones under 40Â atm H2, both catalysts exhibited high catalytic activities (more than 97% conversions) and moderate enantioselectivities (33-54% ee). Furthermore, the chiral Rh catalyst 5 could be easily recovered and used repetitively five times without significantly affecting its catalytic activity and enantioselectivity. A catalytic comparison of the mesoporous silica-supported chiral Rh catalyst 4 prepared by a postmodification method is also discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Inorganic Chemistry
Authors
Guohua Liu, Mouming Liu, Yunqiang Sun, Jianyao Wang, Chuanshou Sun, Hexing Li,