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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2293-2299 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Medium and Large Rings, IX. [10]Paracyclophanes from CyclododecanoneA new approach to the [10]paracyclophane system starting from cyclododecanone is described. Key steps of this synthesis are the Diels-Alder reaction of 3,4-decanofuran 1 with dimethyl acetylenedicarboxylate, the irradiation of the cycloadduct 2 to the oxaquadricyclane 3 and the thermolysis of the latter to give 4A/4B. The β,β′-decano-bridge oxepin 4A is in a valence tautomeric equilibrium with 4B, the arene oxide of the [10]paracyclophane 5a.
    Notes: Ein neuer Zugang zum [10]Paracyclophan-System, ausgehend von Cyclododecanon, wird beschrieben. Schlüsselschritte sind die Diels-Alder-Reaktion des 3,4-Decanofurans 1 mit Acetylen-dicarbonsäure-dimethylester zu 2, die Belichtung von 2, zum Oxaquadricyclan 3 und dessen Thermolyse zu 4A/4B. Das β,β′-decanoüberbrückte Oxepin 4A steht im Valenztautomerie-Gleichgewicht mit 4B, dem Arenoxide des [10]Paracyclophans 5a.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Oxepines ; Ruthenium tetroxide oxidation ; Macrocyclic di-, tri-, and tetraketones ; Quinoxaline derivates ; Ether cleavage ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Medium and Large Rings, XXVIII. - The Ruthenium Tetroxide Oxidation of 3,6-Alkano-4,5-oligomethyleneoxepines - A New Approach to Macrocyclic Di-, Tri-, and TetraketonesThe oxepines 3, 7, and 9 are oxidized by means of ruthenium tetroxide to give various types of macrocyclic ketones such as 4, 8 and 10. The diketones 12 can be synthesized by ether cleavage of 9a to give 11a and subsequent oxidation of 11b and 11d to the monocyclic compounds 12a and 12b.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 769-774 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The synthesis of ten 3,6-hexanooxepines 3 from furans and cyclooctyne is described. The substituents can be varied either in the starting material, i.e. in the 3,4 position of the furans, or by later modification of the oxepines 3. The approach failed with two cyano and methoxy groups. The regioselectivity of the formation of the oxepines 3 from the oxaquadricyclanes 2 is discussed.
    Notes: Die Synthese von zehn 3,6-Hexanooxepinen 3 aus Furanen und Cyclooctin wird beschrieben. Dabei können die Substituenten entweder zu Beginn, d. h. in 3,4-Stellung der Furane, oder nachträglich durch Abwandlung der Oxepine variiert werden. Das Verfahren versagte beim Vorliegen von zwei Cyan- und Methoxygruppen. Die Regioselektivität der Bildung von 3 aus den Oxaquadricyclanen 2 wird diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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