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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1635-1642 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of SqualeneThe unsaturated hydrocarbon squalene, C30H50, has been crystallized from ether/methanol 2:5 (m.p. - 5°C) and its crystal structure has been analyzed at - 110°C. Squalene crystallizes with two formula units in the space group P21/n in a cell of following dimensions: a = 761.2(3), b = 627.4(3), c = 2853.3(16) pm, ß = 93.56(3)°. The molecule is in a stretched STCES̄TCESTS̄ETSECTS̄**) conformation with C i-symmetry. Deviations from a fully stretched conformation are caused by the methyl substituents. The techniques used for the handling of low melting crystals are described in detail.
    Notes: Der ungesättigte Kohlenwasserstoff Squalen (C30H50) wurde aus Ether/Methanol 2:5 bei - 30°C kristallisiert (Schmp. - 5°C) und die Kristallstruktur bei - 110°C bestimmt. Die monokline Elementarzelle [a = 761.2(3), b = 627.4(3), c = 2853.3(16) pm, ß = 93.56(3)°] enthält zwei Formeleinheiten und gehört zur Raumgruppe P21/n. Die Konformation des Moleküls ist gestreckt (STCES̄TCESTS̄ETSECTS̄)**) und weist Ci-Symmetrie auf. Die Faltung der Squalenkette wird jeweils durch die Methylgruppe benachbarter Moleküle im Kristallgitter hervorgerufen. Die angewandten Techniken der Kristallisation und der Montage bei niedrigen Temperaturen werden in Einzelheiten beschrieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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