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Author: Spannenberg, Anke × End date: 2024 × Start date: 2020 × Has files: Yes × Subject: molybdenum × WGL Institute: LIKAT ×

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    Synthesis of Molybdenum Pincer Complexes and Their Application in the Catalytic Hydrogenation of Nitriles
    (Weinheim : Wiley-VCH Verlag, 2020) Leischner, Thomas; Spannenberg, Anke; Junge, Kathrin; Beller, Matthias
    A series of molybdenum(0), (I) and (II) complexes ligated by different PNP and NNN pincer ligands were synthesized and structurally characterized. Along with previously described Mo−PNP complexes Mo-1 and Mo-2, all prepared compounds were tested in the catalytic hydrogenation of aromatic nitriles to primary amines. Among the applied catalysts, Mo-1 is particularly well suited for the hydrogenation of electron-rich benzonitriles. Additionally, two aliphatic nitriles were transformed into the desired products in 80 and 86 %, respectively. Moreover, catalytic intermediate Mo-1a was isolated and its role in the catalytic cycle was subsequently demonstrated. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
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    Tetra­carbonyl-2κ4C-[μ-5-methyl-1,1,3-triphenyl-2-(propan-2-yl)-2,4-di­aza-1,3-diphosphahexan-4-ido-1κN4:2κP1,P3](N,N,N′,N′-tetra­methyl­ethane-1,2-di­amine-1κ2N,N′)lithiummolybdenum
    (Chester : IUCr, 2018) Höhne, Martha; Spannenberg, Anke; Müller, Bernd H.; Peulecke, Normen; Rosenthal, Uwe
    The title complex, [LiMo(C6H16N2)(C24H29N2P2)(CO)4], contains a distorted octa­hedrally coordinated molybdenum centre bearing a li­thia­ted P,P′-cis-chelating PNPN ligand, which results in a nearly planar four-membered metallacycle. The Li atom is coordinated by one equivalent tetra­methyl­ethylenedi­amine. In the crystal, mol­ecules are linked via weak C—H...O inter­actions, forming a chain along the b-axis direction.
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    Tetra­carbon­yl[N-(di­phenyl­phosphanyl-κP)-N,N′-diisoprop­yl-P-phenyl­phospho­rus di­amide-κP]molybdenum(0) with an unknown solvent
    (Chester : IUCr, 2018) Höhne, Martha; Gongoll, Marc; Spannenberg, Anke; Müller, Bernd H.; Peulecke, Normen; Rosenthal, Uwe
    The title complex, [Mo(C24H30N2P2)(CO)4], contains a molybdenum centre bearing a P,P′-cis-chelating Ph2PN(iPr)P(Ph)NH(iPr) and four carbonyl ligands in a distorted octa­hedral coordination geometry. This results in a nearly planar four-membered metallacycle. In the crystal, mol­ecules are linked by N—H...O and C—H...O hydrogen bonds to form layers parallel to the ac plane. For the final refinement, the contributions of disordered solvent mol­ecules were removed from the diffraction data with SQUEEZE in PLATON [Spek (2015). Acta Cryst. C71, 9–18]. The given chemical formula and other crystal data do not take into account the unknown solvent mol­ecule(s).
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    Tetra­carbon­yl[4,4-dimethyl-2-(pyridin-2-yl)-2-oxazoline-κ2N,N′]molybdenum(0)
    (Chester : IUCr, 2019) Steinlechner, Christoph; Spannenberg, Anke; Junge, Henrik; Beller, Matthias
    In the title compound, [Mo(C10H12N2O)(CO)4], the molybdenum(0) center is surrounded by a bidentate di­imine [4,4-dimethyl-2-(pyridin-2-yl)-2-oxazoline] and four carbonyl ligands in a distorted octa­hedral coordination geometry. The di­imine ligand coordinates via the two nitro­gen atoms.