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  • Inorganic Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4725-4742 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stepwise Oxidation of 1,2-Naphthoquinone and Cyclohepta[de]naphthalene-7,8-dione (o-Pleiadienequinone)Oxidation of cyclohepta[de]naphthalene-7,8-dione (o-pleiadienequinone) (1) and o-naphtho-quinone (2) yields the corresponding epoxides 14 and 3, respectively. The stepwise oxidation of 3 yields derivatives of 1,2,3,4-tetraoxonaphthalene, while the stepwise oxidation of 14 finally results in the formation of phenalenetrione or phenalenone derivatives.
    Notes: Durch Oxidation von Cyclohepta[de]naphthalin-7,8-dion (o-Pleiadienchinon) (1) und o-Naphthochinon (2) werden die entsprechenden Epoxide 14 und 3 erhalten. Die stufenweise Oxidation von 3 führt zu Derivaten des 1,2,3,4-Tetraoxonaphthalins, die stufenweise Oxidation von 14 gibt dagegen unter Ringverengung Derivate des Phenalentrions bzw. Phenalenonderivate.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1917-1926 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Electronic Structure of 1,4-Disubstituted ButanetetronesThe He(I) photoelectron (PE) spectra of the disubstituted butanetetrones 1 a - e have been recorded. The assignment of the first PE bands is based on semiempirical calculations. For 1 a - e the first bands could be assigned to ionization events from lone pair combinations on the oxygen atoms and in the case of 1 b - e additionally to ionizations from π-orbitals localized on the aromatic rings. The comparison between the PE bands of 1 d, 1,3-diphenyl-1,2,3-propanetrione, benzil, and benzophenone yields the result that the energy split between the n-orbital energies con-verges towards a value of about 3 eV. The interactions among the lone pairs and between lone pairs and the σ frame in 2 b - d are discussed, based on INDO calculations using localized orbitals.
    Notes: Die He(I)-Photoelektronen(PE)-Spektren der 1,4-disubstituierten Butantetrone 1 a - e wurden gemessen und anhand semiempirischer Rechnungen zugeordnet. Bei 1 a - e wurden die ersten Banden Ionisationen aus Linearkombinationen der einsamen Elektronenpaare an den Sauerstoffen und im Fall von 1 b - e noch zusätzlich Ionisationen aus den aromatischen π-Orbitalen zugeordnet. Der Vergleich zwischen den PE-Banden von 1 d, 1,3-Diphenyl-1,2,3-propantrion, Benzil und Benzophenon zeigt, daß die Aufspaltung zwischen den n-Orbitalenergien einem Grenzwert von etwa 3 eV zustrebt. Die Wechselwirkung zwischen den n-Orbitalen, den n-Orbitalen und dem σ-Gerüst (Through-Space- und Through-Bond-Wechselwirkung) in den vic. Di-, Tri- und Tetra-ketonen 2 b - d wird anhand von lokalisierten Orbitalen, die nach der INDO-Methode erhalten werden, diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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