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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
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  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Enantio-differentiating hydrogenation of methyl acetoacetate over modified nickel catalysts: effects of nickel dispersion on the enantio-selectivity of catalysts

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Title
Enantio-differentiating hydrogenation of methyl acetoacetate over modified nickel catalysts: effects of nickel dispersion on the enantio-selectivity of catalysts
Other Titles
Enantio-differentiating hydrogenation of methyl acetoacetate over modified nickel catalysts: effects of nickel dispersion on the enantio-selectivity of catalysts
Author
Jo, DonghyunLee, Jae SungLee, Kyung Hee
Keywords
MODIFIED RANEY-NICKEL; C=O DOUBLE-BOND; SILICA-SUPPORTED NICKEL; IN-SITU MODIFICATION; TARTARIC ACID; ASYMMETRIC HYDROGENATION; DEPOSITION-PRECIPITATION; (R,R)-TARTARIC ACID; PROCHIRAL KETONES; NI/SIO2 CATALYST
Issue Date
2004
Publisher
SPRINGER
Citation
RESEARCH ON CHEMICAL INTERMEDIATES, v.30, no.9, pp.889 - 901
Abstract
Enantio-differentiating hydrogenation of methyl acetoacetate was performed over the supported nickel catalysts modified by the solution of (R,R)-tartaric acid or (S)-malic acid and NaBr. The reduction temperature of supported nickel was the most important factor determining the enantio-selectivity of catalysts. The reduction temperature changed the nickel dispersion, by which the quantity and coverage of modifier adsorption were varied. The enantio-selectivity of modifiers both (R,R)-tartaric acid and (S)-malic acid were compared at various reduction temperatures. (R,R)tartaric acid with two hydroxyl groups in a molecule showed an optimum coverage on the nickel surface that gave the maximum ee value. The maximum ee value was 72% at the reduction temperature of 973 K. In contrast, (S)-malic acid with one hydroxyl group in a molecule showed a monotonous decrease in ee and decreasing amounts of adsorbed modifier with increasing reduction temperatures
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DOI
10.1163/1568567042420730
ISSN
0922-6168
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ECHE_Journal Papers
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