01953nas a2200241   4500008004100000022001400041245012100055210006900176260007300245300001000318490000800328520104500336653002201381653001801403653003301421653002201454653002701476100001701503700001901520700001701539700002801556856012701584       2009                        eng d  a0926-860X00aOxidative kinetic resolution of alcohols using chiral Mn-salen complex immobilized onto ionic liquid modified silica0 aOxidative kinetic resolution of alcohols using chiral Mnsalen co  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a17-250 v3543 a<p>The supported ionic liquid strategy has been applied for the immobilization of chiral Mn(III) salen complex onto ionic liquid modified silica. Chiral Mn(III) salen complex was immobilized over silica through a thin film of covalently anchored imidazolium ionic liquid. These catalysts were characterized by N(2) sorption, XRD, MR, DRUV-vis, and elemental analysis. The results showed that the chiral Mn(III) salen complex could be successfully immobilized onto the modified mesoporous materials and that the long-range mesoporous ordering of parent supports was maintained after the immobilization. The immobilized catalyst provided good enantioselectivity and activity in the heterogeneous catalysis of the oxidative kinetic resolution of secondary alcohol and can be recovered and recycled for four times without obvious loss of enantioselectivity and activity. Oxidative kinetic resolutions of meso-diols, hydroxyl ester and primary alcohol were also studied using this catalyst system. (C) 2008 Elsevier B.V. All rights reserved.</p>10aMesoporous silica10aMn(III) salen10aOxidative kinetic resolution10aSecondary alcohol10aSupported ionic liquid1 aSahoo, Suman1 aKumar, Pradeep1 aLefebvre, F.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/oxidative-kinetic-resolution-alcohols-using-chiral-mn-salen-complex-immobilized-ionic-002363nas a2200229   4500008004100000022001400041245008400055210006900139260007500208300001200283490000700295520151500302653003501817653003101852653001901883653002201902653003301924100001701957700002001974700002801994856011102022       2011                        eng d  a1571-101300aOrdered mesoporous silica as supports in the heterogeneous asymmetric catalysis0 aOrdered mesoporous silica as supports in the heterogeneous asymm  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGER/PLENUM PUBLISHERScSEP  a200-2140 v153 a<p>Enantioselective synthesis of organic compounds has been studied by homogeneous catalysts for several years. However, these catalysts have yet to make a significant impact on industrial scales for fine chemical synthesis. A primary reason is the designing of a homogeneous asymmetric catalyst, which requires relatively bulky ligands and catalyst recovery and recycling often causes problems. One of the convincing ways to overcome this problem is to immobilise the asymmetric catalyst onto a solid support and the resulting heterogeneous asymmetric catalyst system can, in principle, be readily re-used. A large number of supports such as inorganic oxides including zeolites, alumina, zirconia, silica and organic polymers have been employed as supports in heterogeneous asymmetric catalysis. Therefore, in this review article we have summarized the work done by us in our laboratory on the immobilization of chiral transition metal complexes such as Ru, Ir, Mn and Ti onto ordered mesoporous silica and its asymmetric catalysis. All these immobilized catalysts were well characterized by different physicochemical techniques to confirm the structural retention of the support as well as the active metal complex after immobilization. This report includes our asymmetric catalytic investigations in enantioselective reactions such as hydrogenation of ketones, olefins, oxidation of sulfides and oxidative kinetic resolution of alcohols and sulfoxides through immobilized heterogeneous catalyst systems.</p>10aEnantioselective hydrogenation10aEnantioselective oxidation10aImmobilization10aMesoporous silica10aOxidative kinetic resolution1 aSahoo, Suman1 aBordoloi, Ankur1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/ordered-mesoporous-silica-supports-heterogeneous-asymmetric-catalysis-0