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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 1341-1344 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Macrocyclic [2n] Paracyclophanes and Crystal Structure of [2.2.2.2.2.]Paracyclophane [p-C6H4CH2CH2]5The synthesis of [2n]paracyclophanes from α,α′-dibromo-p-xylene and sodium/tetraphenylethene in tetrahydrofuran has been improved, and the separation of the components of the resulting cyclophane mixture (50% yield) by chromatography has been optimized. The crystal structure of the n = 5 homologue has been determined. The compound crystallizes in the monoclinic space group P21/n with two crystallographically independent molecules in the unit cell. The two forms have different conformations, which indicates a high flexibility of the macrocycle.
    Notes: Das Syntheseverfahren für [2n]Paracyclophane aus α,α′-Dibrom-p-xylol und Natrium/Tetraphenylethen in Tetrahydrofuran wurde verbessert und die chromatographische Auftrennung des mit fast 50% Ausbeute entstehenden Cyclophangemischs in die Komponenten optimiert. Die Kristallstruktur des Homologen mit n = 5 wurde bestimmt. Die Substanz kristallisiert monoklin in der Raumgruppe P21/n mit zwei kristallographisch unabhängigen Molekülen in der Elementarzelle. Die beiden Formen haben unterschiedliche Konformation, was eine beträchtliche Flexibilität des Makrocyclus andeutet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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