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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3164-3175 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Asteranes, XI. 1,4-Dihydroxytricyclo[6.4.0.04,9]dodecane-7, 10-dione from FuranophaneIn aqueous formic acid furanophane (3) is hydrolysed slowly first to the diketone 4 and than further, at the second furane ring, to give cyclododecatetraone 6 which undergoes fast intramolecular recyclisations. 1-Hydroxybicyclo[6.4.0]dodecane-4,7,10-trione (7) is the main product in this process, and reacts by a second ring closure yielding the title compound 8, the structure of which was elucidated by X-ray analysis. 8 has C2 symmetry and a 1,6-ethanobridged cis-decalin system with all three cyclohexane units in slightly twisted chair conformations.
    Notes: Furanophan (3) wird in wäßriger Ameisensäure langsam zuerst an einem Ring zum Diketon 4 und dann am zweiten Ring zum Cyclododecatetraon 6 geöffnet, welches rasch unter intramolekularer C—C-Verknüpfung wieder cyclisiert. Dabei wird 1-Hydroxybicyclo[6.4.0]-dodecan-4.7,10-trion (7) zum Hauptprodukt, und dieses unterliegt einem zweiten Ringschluß zur Titelverbindung 8, deren Struktur durch Röntgenanalyse ermittelt wird. 8 besitzt C2-Symmetrie und ein 1,6-äthano-überbrücktes cis-Decalingerüst, in dem alle drei Cyclohexanringe eine etwas verdrillte Sesselkonformation einnehmen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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