02330nas a2200277   4500008004100000022001400041245013000055210006900185260009500254300001100349490000800360520129000368653001001658653003501668653001901703653002001722653001801742653002901760653002301789653002801812100001701840700001901857700001701876700002801893856013101921       2008                        eng d  a0021-951700aEnantioselective hydrogenation of olefins by chiral iridium phosphorothioite complex covalently anchored on mesoporous silica0 aEnantioselective hydrogenation of olefins by chiral iridium phos  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcFEB  a91-1000 v2543 a<p>Chiral monodentate phosphorous-based ligands have proven effective for the enantioselective hydrogenation of olefins. Binol-derived monodentate phosphorothioite (PS) ligand was synthesized from binol and thiopropyltriethoxysilane, and its iridium complex was covalently anchored to mesoporous silica supports like SBA-15, MCM-41, and MCM-48. These catalysts were characterized by different physicochemical techniques and assessed for their catalytic performances in the heterogeneous asymmetric hydrogenation of itaconic acid and its derivatives. It was found that the catalytic activities and enantioselectivities of the heterogenized iridium complex (IrPSSBA-15) in the hydrogenation reactions were comparable to its homogeneous analogue. Binol-derived monodentate phosphorothioite ligand in heterogeneously anchored form (iridium complex) is a more effective catalyst than the reported monodentate phosphorous ligand systems in the hydrogenation reactions, possibly due to the changes in electronic properties around the iridium metal center. The effects of substrate-to-catalyst molar ratio, solvents, and temperature on substrate conversions and enantioselectivities, of the products were investigated in hydrogenation reactions. (c) 2007 Elsevier Inc. All rights reserved.</p>10abinol10aEnantioselective hydrogenation10aImmobilization10airidium complex10aitaconic acid10aMesoporous silica SBA-1510amonodentate ligand10aphosphorothioite ligand1 aSahoo, Suman1 aKumar, Pradeep1 aLefebvre, F.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/enantioselective-hydrogenation-olefins-chiral-iridium-phosphorothioite-complex-covalently-0