Ordered Mesoporous Silica as Supports in the Heterogeneous Asymmetric Catalysis |
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Authors: | Suman Sahoo Ankur Bordoloi S B Halligudi |
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Institution: | (1) Inorganic Chemistry and Catalysis Division, National Chemical Laboratory, Pune, 411008, India;(2) Catalysis Centre for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-gu, Daejeon, 305-600, Korea |
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Abstract: | 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. |
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