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  • 1995-1999
  • 1980-1984  (2)
  • Inorganic Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2866-2883 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Allopolarization principle and its Applications, IV1) Substituent Effects in the Methylation of Enolate AnionsThe ratio of O- and C- methylated products in the reaction of the sodium salts of acetophenones 1, propiophenones 3, phenylacetones 5, β-dicarbonyl compounds 12, α-cyanocarbonyl compounds 13, acetaldehyde, propionaldehyde, and diethyl ketone with dimethyl sulfate, methyl iodide, and trimethyl phosphate in HMPTA has been determined with regard to the effect of substituents. In some case the influence of solvents, concentration and temperature has also been studied.
    Notes: Das Verhältnis von O- zu C-methylierten Produkten bei der Umsetzung der Natriumsalze von Acetophenonen 1, Propiophenonen 3, Phenylacetonen 5, β-Dicarbonylverbindungen 12, α-Cyancarbonylverbindungen 13, Acetaldehyd, Propionaldehyd und Diethylketon mit Dimethylsulfat, Methyliodid und Trimethylphosphat in Hexamethylphosphorsäuretriamid wurde im Hinblick auf der Substituenteneffekt bestimmt. In einigen Fällen wurde auch den Einfluß des Lösungsmittels, der Konzentration und der Temperatur untersucht.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2884-2897 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Allopolarization principle and its Applications, V1 13C NMR Spectra of Enolates and Related CarbanionsThe 13C NMR Spectra of the sodium salts of p-substituted propiophenones and phenylacetones, of benzylcarbonyl compounds, acetonitrile derivatives, and β-dicarbonyl compounds reveal the influence of substituents on the charge distributions in enolates and related carbanions. Increments for substituents on the methanide-C are evaluated (Table 12.). The charge densities on C-α of benzyl anions can be derived from the C-p13C NMR chemical shift. The special effect of cyano groups in carbanions is discussed.
    Notes: Die 13C—NMR-Spektren der Na-Salze von p-substituierten Propiophenonen un Phenylacetonen, von Benzylcarbonylverbindungen, Acetonitrilderivaten und β-Dicarbonylverbindungen zeigen den Einfluß von Substituenten auf die Ladungsverteilung in Enolaten und verwandten Carbanionen. Inkremente für Substituenten am Methanid-C werden ermittelt (Tab.12). Die Ladungsdichten an C-α von Benzyl-Anionen lassen sich aus den C-p13C—NMR-Signalen ableiten. Der besondere Effekt von Cyangruppen in Carbanionen wird diskutiert.
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
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