With A Mesoporous Structure Of Organic Metal Catalyst Synthesis And Catalytic Asymmetric Reaction

Mesoporous structure of the SBA-15 nanomaterials as a new type of supported materials widely used in chiral ligands and supported metal catalyst .It does not only solve the expensive chiral ligands and metal catalyst separation and reuse issues; But also we can use the limiting space of the channels in mesoporous metal catalysts to improve catalytic domain of chiral catalysts in the micro-environment and improve asymmetric catalytic activity and enantio- selectivity.Mesoporous silica-supported chiral Ru and Ir catalysts with highly ordered dimensional-hexagonal mesostructure was prepared by postgrafting organometallic complex on SBA-15.we study the influences of the surface properties,the mesostructures and the metals of chiral complex on the catalytic performance of the materials.During asymmetric transfer hydrogenation of aromatic ketones ,the mesoporous silica-supported chiral Ru catalyst exhibited high catalytic activity (more than 99% conversions) and excellent enantioselectivity (up to more than 98% ee).During asymmetric hydrogenation of various aromatic ketones under 40atm H2, the mesoporous silica-supported chiral iridium catalyst exhibited high catalytic activity (more than 95% conversions) and excellent enantioselectivity (up to more than 99% ee). Such catalysts could be recovered easily and used repetitively seven times without significantly affecting the catalytic activity and the enantioselectivity.