Synthesis of Stable Phosphomide Ligands and their Use in Ru-Catalyzed Hydrogenations of Bicarbonate and Related Substrates

Authors

  • Dr. Saravanan Gowrisankar,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Dr. Christopher Federsel,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Dr. Helfried Neumann,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Carolin Ziebart,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Dr. Ralf Jackstell,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Dr. Anke Spannenberg,

    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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  • Prof. Dr. Matthias Beller

    Corresponding author
    1. Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
    • Leibniz-Institut für Katalyse e.V. Universität Rostock, Albert-Einstein-Straße 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-5000
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Abstract

New benzoyl- and naphthoyl-substituted phosphines have been synthesized, which are stable to air and moisture. Testing these so-called phosphomide ligands in the presence of different ruthenium precursors, the hydrogenation of sodium bicarbonate (NaHCO3) to sodium formate (NaHCO2) proceeded with good catalyst turnover numbers in the range of 1300–1600 at 80 °C and a total pressure of hydrogen of 60 bar in the absence of amines or other additives. Similarly, catalytic hydrogenations of carbon dioxide, cinnam-, and benzaldehyde were possible with these new ruthenium complexes. As an intermediate of the catalytic cycle the defined ruthenium complex [(η6-C6H6)-RuCl2(Cy2P(1-naphthoyl)] (Cy=cyclohexyl) was prepared and characterized by X-ray crystallography.

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