Abstract
Structurally different chiral ruthenium complexes were used in the asymmetric hydrogenation of methyl acetoacetate to methyl (R)-3-hydroxybutanoate. The naphthalene and dioxazole biphosphine structure variations revealed a strong effect on the reaction rate and the parameter of enantioselectivity. The highest optical yields were achieved with catalysts bearing two metal centers and comprising the quaternary ammonium ionic character.
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Acknowledgments
The authors wish to acknowledge the Academy of Sciences of the Czech Republic for supporting this project. TF specifically thanks the Ministry of Education of the Czech Republic, project no. 203/08/H032, for funding partly his PhD fellowship.
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Floris, T., Kluson, P. & Slater, M. Stereoselective hydrogenation of methyl acetoacetate over structurally different chiral ruthenium complexes. Reac Kinet Mech Cat 102, 67–74 (2011). https://doi.org/10.1007/s11144-010-0256-1
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DOI: https://doi.org/10.1007/s11144-010-0256-1