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  • General Chemistry  (7)
  • Organic Chemistry  (1)
  • 1
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die optisch Aktivität eignet sich für detaillierte Aussagen über Konfiguration und Konformation bei Methan-Derivaten,wenn man die Chiralitätsfunktion nach der Theorie der Chiralitätsfunktionen und quantenmechanischen Theorie der optischen Aktivität der Methan-Derivate in ihre Komponenten zerlegt und diese mit dem experimentellen Ergebnis vergleicht. Im vorliegenden Beitrag wird ein erster Schritt in diese Richtung unternommen und gezeigt, daß das zweite Näherungsverfahren für die Bestimmung des konformationsunabhängigen Beitrage zur optischen Aktivität quantitativ gute Resultate liefert. Die Beschreibung des gesamten optischen Drehwinkels durch diese Komponente wird erwartungsgemäß für solche Derivate schlecht, wo spezifische Konformationen durch Wechselwirkung zwischen den Liganden, wie z. B. Wasserstoffbrückenbindungen. bevorzugt auftreten. Ein quantitatives Verständnis für solche Zusatzeffekte erscheint unter Verwendung von Analysen der hier beschriebenen Art aussichtsreich.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 932-933 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 919-920 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 739-743 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 292-293 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 739. DOI:10.1002/anie.198207390
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0570-0833
    Keywords: Chirality functions ; Optical activity ; Methane derivatives ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The optical activity can provide detailed information about the configuration and conformation of methane derivatives if the chirality function is resolved, according to the theory of chirality functions[3] and the quantum mechanical theory of the optical activity of methane derivatives[4], into its components which are compared with experimental data. A first step in this direction is undertaken in the present article and it will be shown that the second approximation method for determining the conformationally independent contribution to the optical activity yields quantitatively good results. Description of the overall optical rotation by this component is expectedly poor where interactions between ligands, e. g. hydrogen bonding, tend to favor specific conformations. A quantitative understanding of such additional effects appears promising in conjunction with analyses of the kind described.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 401-405 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ozonolysis of Dihydrolinalool(+)-(R)-3,7-Dimethyl-6-octen-3-ol (dihydrolinalool, 2) is prepared from (+)-(S)-3,7-dimethyl-1.6-octadien-3-ol (linalool, 1) by partial hydrogenation. The compound is ozonized in ethyl acetate and hydrogenated, and the resulting hemi-acetal 3b reduced to (+)-(R)-3-methyl-3-hexanol (4) by the Wolff-Kishner method. The analogous procedure in methanol or ethanol yields (i-)-(2R,5S)-2-ethyl-5-methoxy-2-methyloxolane (5a) and its (-)-(2R,5R)-isomer 5b, or the corresponding 5-ethoxy compounds. The mechanism and synthetic utility of this reaction are discussed.
    Notes: Aus ( +)-(S)-3,7-Dimethyl-1,6-octadien-3-ol (Linalool, 1) erhält man durch partielle Hydrierung (+)-(R)-3,7-Dimethyl-6-octen-3-ol (Dihydrolinalool, 2). Dieses liefert nach Ozonolyse in Essigester und anschließender Hydrierung ein Halbacetal 3b, das nach Wolff-Kishner-Reduktion zu (+)-(R)-3-Methyl-3-hexanol (4) f¨hrt. Bei Verwendung von Methanol oder Äthanol sind die Reaktionsprodukte (+)-(2R,5S)-2-Äthyl-5-methoxy-2-methyloxolan (5a) sowie das (-)-(2R,SR)-Isomer 5b bzw. die anlogen 5-Äthoxyverbindungen. Bildungsweise und Anwendbarkeit dieser Reaktion werden erörtert.
    Additional Material: 1 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 298-298 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1982, 739-743
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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