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  • 1980-1984  (4)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 1584-1586 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 481 (1981), S. 71-77 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Mechanism of the Reaction of Organonickel Compounds of the Type (bipy)NiR2 (R = —C2H5, —CH2—Ph) with Aldehydes and Nitroso Compounds. An ESR StudyESR investigations of the reaction of (bipy)Ni(C2H5)2 and (bipy)Ni(CH2Ph)2 with nitrosodurene show a different behaviour during the start process. In the former case first of all a paramagnetic unstable complex compound was detected containing R—NO as a ligand. After that R—NO is shown to cause a radicalic elimination of the ethyl ligands. For (bipy)Ni(CH2Ph)2 the formation of a paramagnetic complex intermediate is not observed because of sterical reasons; the radicalic elimination process take place immediately.In presence of propionic aldehyde or benzaldehyde nitrosodurene as a hetero-π-system completes with the aldehydes giving rise to radical reactions. In the absence of nitrosodurene propionaldehyde will be dimerized catalytically by the (bipy)NiR2 complexes. The mechanism of these reactions will be discussed.
    Notes: ESR-Untersuchungen der Reaktion von (dipy)Ni(C2H5)2 und (dipy)-Ni(CH2Ph)2 mit Nitrosodurol (R—NO) zeigen einen unterschiedlichen Reaktionsablauf in der Startphase. Im ersten Fall bildet sich zunächst eine paramagnetische. instabile Komplexverbindung, die ein R—NO als Liganden enthält. Anschließend wird durch R—NO eine radikalische Eliminierung der Ethylliganden induziert. Das paramagnetische Komplexintermediat wird bei (dipy)-Ni(CH2Ph)2 nicht beobachtet, was auf sterische Gründe zurückzuführen ist. Es erfolgt unmittelbar die radikalische Eliminierung.In Anwesenheit von Propionaldehyd bzw. Benzaldehyd wird eine Konkurrenzreaktion des Nitrosodurols als Hetero-π-System mit den Aldehyden beobachtet. Die Nitrosoverbindung induziert eine Radikalbildung, während Propionaldehyd mit (dipy)NiR2 allein einer katalytischen Aldolreaktion unterliegt. Der Mechanismus der Reaktionen wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 483 (1981), S. 63-68 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Activation of Carbon Dioxide by Metal(0) Complexes. Oxidative Coupling of Carbon Dioxide and Aldehydes on the Central Atom Nickel(0)The oxidative coupling of carbon dioxide and aliphatic aldehydes on the complex moiety 2,2′-Bipyridine-nickel(0) yields crystalline complexes, containing five-membered chelate rings with Nickel-C- and Nickel-O-σ-bonds (Nickela-2,4-dioxolane-3-one). IR, UV/VIS- and H-NMR-spectra are reported; the mechanism of the coupling reaction is discussed.
    Notes: Die oxidative Kopplung von Kohlendioxid mit aliphatischen Aldehyden am elektronenreichen Komplexrumpf 2,2′-Dipyridyl-nickel(0) führt zu kristallinen Komplexverbindungen, in denen neben 2,2′-Dipyridyl Chelatfünfringe mit Nickel-C- und Nickel-O-σ-Bindungen vorliegen. (Nickela-2, 4-dioxolan-3-one). IR, UV/VIS- und H-NMR-Spektren werden vorgestellt; der Mechanismus der Reaktion wird diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations to the Reactivity of Organonickel Compounds - “Spin Trapping” as an Indicator Method for the Relative Reactivity of Nickel-Carbon BondsThe spin trap nitrosodurene reacts with σ-alkyl, σ-aryl, π-allyl, σ-allyl, and π-cyclopentadienyl compounds of nickel(II) to form nitrosoduryl radicals which can be detected by ESR spectroscopy. Nickelolefine and nickel heteroolefine complexes do not react by formation of radicals. The spin trapping method can be generally used as an indicator for determination of structure elements in organonickel compounds and for determination of the relative reactivity of σ- and π-bonded groups.
    Notes: Das Spin-Trap-Reagenz Nitrosoduren reagiert mit σ-Alkyl, σ-Aryl, π-Allyl, σ-Allyl und π-Cyclopentadienylverbindungen des Nickel(II) unter Bildung von Nitrosodurylradikalen, die ESR-spektroskopisch nachweisbar sind. Nickel-Olefin- und -Heteroolefin-Komplexe reagieren normalerweise nicht unter Bildung von Radikalen. Die Spin-Trap-Methode kann allgemein als Indikatormethode zur Bestimmung von Strukturelementen an Nickelorganoverbindungen und zur Bestimmung der relativen Reaktivitäten von σ- und π-gebundenen Gruppen verwendet werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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