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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 507-515 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Liquid-crystallin Ketoxime EstersDisubstituted acetophenoneoximebenzoates 1a-q, 2a-j, a-d, 4a-b and 5a-b are nematic liquid crystals that exhibit remarkable thermal stability and, dependent on their terminal groups, relative low melting points. Binary and ternary mixtures, for which also the melting temperatures have been evaluated theoretically, are liquid far below room temperature and stable under the influence of a. c. fields. The substitution of CH3 by C2H5 or n-C3H7 in 6a-d and 7 leads to pronounced depressions in the clearing points.
    Notes: Disubstituierte Acetophenonoximbenzoate 1a-q, 2a-j, 3a-d, 4a-b und 5a-b sind nematische Flüssigkristalle mit bemerkenswerter thermischer Stabilität und - unabhängig von den Flügelgruppen  -  relativ niedrigen Schmelzpunkten. Binäre und ternäre Gemische, deren Schmelztemperaturen auch theoretisch bestimmt wurden, sind weit unterhalb Zimmertemperatur flüssig und im Wechselstromfeld beständig. Der Austausch von CH3 durch C2H5 oder n-C3H7 führt in 6a-d und 7 zu starken Klärpunktsdepressionen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 1101-1105 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ion-molecule reactions between protonated acetaldehyde and methanol were explored on a quadrupole, quistor, quadrupole tandem mass spectrometer. In addition to proton transfer to methanol and subsequent methanol ionmolecule chemistry, the protonated acetaldehyde-methanol adduct and methylated acetaldehyde could be detected. Experiments with labelled counterparts showed that the formation of methylated acetaldehyde corresponds to substitution of the oxygen-bound hydrogen of protonated acetaldehyde by the methyl group of methanol. The reaction rates involved and H-D exchange rates were determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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