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Facile Synthesis of Optically-Active γ-Valerolactone from Levulinic Acid and Its Esters Using a Heterogeneous Enantio-Selective Catalyst. Catal Letters 2018. [DOI: 10.1007/s10562-017-2291-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Osawa T, Kizawa T, Takano F, Ikeda S, Kitamura T, Inoue Y, Borovkov V. Catalytic Enantiodifferentiating Hydrogenation with Commercial Nickel Powders Chirally Modified by Tartaric Acid and Sodium Bromide. ChemCatChem 2013. [DOI: 10.1002/cctc.201300727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Chalid M, Broekhuis A, Heeres H. Experimental and kinetic modeling studies on the biphasic hydrogenation of levulinic acid to γ-valerolactone using a homogeneous water-soluble Ru–(TPPTS) catalyst. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.04.004] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Toshima H, Yumoto K, Hasegawa M. Synthesis of Optically Active γ-Valerolactone and γ-Nonanolactone via Optical Resolution Using Chiral Amine Derived from Amino Acid. HETEROCYCLES 2010. [DOI: 10.3987/com-09-11863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Osawa T, Kitano M, Harada T, Takayasu O. Enantio-Differentiating Hydrogenation of Methyl acetoacetate over Asymmetrically Modified Reduced Nickel Catalysts: The Effects of the Coverage of the Modifiers on the Enantio-Differentiating Ability. Catal Letters 2008. [DOI: 10.1007/s10562-008-9765-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Osawa T, Koganei K, Ito N, Kitano M, Harada T, Takayasu O. Study of the properties of nickel oxide and nickel as precursors for the tartaric acid-NaBr-modified nickel catalyst. Catal Letters 2005. [DOI: 10.1007/s10562-004-3453-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Bartek L, Klusoň P, Červený L. In situ Chiral Modification of Nickel Catalysts for Enantioselective Hydrogenation of Methyl Acetoacetate. ACTA ACUST UNITED AC 2005. [DOI: 10.1135/cccc20051642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Chiral modifications of SiO2-supported and Raney nickel catalysts were studied. The catalysts were employed in asymmetric hydrogenation of methyl acetoacetate (MAA) to (R)- and (S)-enantiomers of methyl 3-hydroxybutanoate. The effects of modification parameters such as type and concentration of modifier; presence of a co-modifier and other additives, pH of modification solution on the enantioselectivity of MAA hydrogenation were discussed. Characteristic features of the in situ modification of Ni/SiO2 were also evaluated and the results obtained were compared with the conventional (premodification) approach. Parameters for the conventional and in situ methods were optimised in a series of experiments for both types of catalysts. The in situ modified Ni/SiO2 was found specifically suitable for repeated use due to virtually no decrease in selectivity and activity.
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