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Start date: 2010 × Type: Text × Subject: homogeneous catalysis × Subject: hydrogenation × WGL Institute: LIKAT ×

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Now showing 1 - 4 of 4
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    A General Regioselective Synthesis of Alcohols by Cobalt-Catalyzed Hydrogenation of Epoxides
    (Weinheim : Wiley-VCH, 2020) Liu, Weiping; Leischner, Thomas; Li, Wu; Junge, Kathrin; Beller, Matthias
    A straightforward methodology for the synthesis of anti-Markovnikov-type alcohols is presented. By using a specific cobalt triphos complex in the presence of Zn(OTf)2 as an additive, the hydrogenation of epoxides proceeds with high yields and selectivities. The described protocol shows a broad substrate scope, including multi-substituted internal and terminal epoxides, as well as a good functional-group tolerance. Various natural-product derivatives, including steroids, terpenoids, and sesquiterpenoids, gave access to the corresponding alcohols in moderate-to-excellent yields. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
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    Towards a methanol economy based on homogeneous catalysis: methanol to H2 and CO2 to methanol
    (Cambridge : Soc., 2015) Alberico, E.; Nielsen, M.
    The possibility to implement both the exhaustive dehydrogenation of aqueous methanol to hydrogen and CO2 and the reverse reaction, the hydrogenation of CO2 to methanol and water, may pave the way to a methanol based economy as part of a promising renewable energy system. Recently, homogeneous catalytic systems have been reported which are able to promote either one or the other of the two reactions under mild conditions. Here, we review and discuss these developments.
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    Non-Pincer-Type Manganese Complexes as Efficient Catalysts for the Hydrogenation of Esters
    (Weinheim : Wiley-VCH, 2017-4-21) van Putten, Robbert; Uslamin, Evgeny A.; Garbe, Marcel; Liu, Chong; Gonzalez-de-Castro, Angela; Lutz, Martin; Junge, Kathrin; Hensen, Emiel J. M.; Beller, Matthias; Lefort, Laurent; Pidko, Evgeny A.
    Catalytic hydrogenation of carboxylic acid esters is essential for the green production of pharmaceuticals, fragrances, and fine chemicals. Herein, we report the efficient hydrogenation of esters with manganese catalysts based on simple bidentate aminophosphine ligands. Monoligated Mn PN complexes are particularly active for the conversion of esters into the corresponding alcohols at Mn concentrations as low as 0.2 mol % in the presence of sub-stoichiometric amounts of KOtBu base.
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    Synthesis of novel chemicals from cardanol as a product of cashew nutshell processing
    (Chichester : Wiley, 2020) Deutsch, Jens; Köckritz, Angela
    The conversion of the worldwide chemical production from fossil to sustainable resources is currently one of the most urgent tasks for the chemical industry. Based on this approach cardanol, a mixture of phenols with C15-chains as substituents is produced in some countries of the tropical zone from the processing of cashew nutshells. The paper reports the specific transformation of the aromatic moiety in this cheap material, and thus, the development of a novel route to potential useful green bifunctional chemicals in gram scale. Accordingly, cardanol was converted successfully in three steps into hexane-1,6-diols. The evaluation of appropriate synthesis methods and suitable conditions for each of these reaction steps is presented as an essential topic of these investigations. The target compounds synthesized in the reaction sequence are potential building blocks for future biomass-based chemicals and monomers for green polymeric materials, surfactants, and lubricants.