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  • 1975-1979  (2)
  • Inorganic Chemistry  (2)
  • Rectal cancer
  • [abr] G-PI; glyco-phosphatidylinositol
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 99-106 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning Oxa[17]annulenesEpoxidation of the tricyclic dimer 1 of cyclooctatetraene generates the monoepoxides 2-4 which upon low temperature photolysis are transformed into three oxa[17]annulenes 5-7. The individual compositions vary quite substantially in each case. The more or less characteristic weakly temperature dependent 1H NMR spectra seem to show a certain degree of π-bond delocalization. The proposals 11 for the configuration of 5 (or 6) as well as 12 for 6 (or 5) are based upon indispensable but insufficient arguments. Additional 1H NMR informations support the configuration deduced for 7 (or 10). 5-7 are thermally rather stable in solution.
    Notes: Epoxidierung des tricyclischen Dimeren 1 des Cyclooctatetraens führt zu den Monoepoxiden 2-4, die bei der Bestrahlung bei tiefen Temperaturen je drei Oxa[17]annulene 5-7 hervorbringen, deren individuelle Anteile jedoch stark variieren. Die mehr oder weniger charakteristischen, schwach temperaturabhängigen 1H-NMR-Spektren deuten eine gewisse π-Bindungsdelokalisation an Die Konfigurationsvorschläge 11 für 5 (oder 6) sowie 12 für 6 (oder 5) basieren auf notwendigen aber nicht hinreichenden Argumenten. Für 7 (oder 10) bestätigen weiterführende 1H-NMR-Informationen den Konfigurationsvorschlag. 5-7 sind in Lösung recht stabil.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 107-124 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloheptadecaoctaenes and [17]Annulenyl AnionsThe dimer 1 of cyclooctatetraene reacts with “methylene” and ethoxycarbonylcarbene to yield different monoadducts 2 and 7-10. From the esters 7-10 the acids 11-13 are available. All endocyclic σ-bonds of the tetracyclic compounds 2,8,11-13 are cleaved by UV light with formation of the cycloheptadecaoctaenes 15-17.17 decarboxylates in acetone cleanly to give crystalline cycloheptadecaoctaene (18). In the presence of bases, the carbon acids 15 and 18 are converted into the [17] annulenyl anion (19). An analogous behaviour is shown by 20 and 22 which yield the same mixture of methyl[17]annulenyl anions (21). Some properties of the seventeen-membered higher vinylogues of cyclopentadiene and cyclopentadienyl anion are investigated.
    Notes: Dimeres Cyclooctatetraen 1 reagiert mit „Methylen“ und Ethoxycarbonylcarben zu verschiedenen Monoaddukten 2 und 7-10. Aus den Estern 7-10 sind die Säuren 11-13 zugänglich. In den Tetracyclen 2, 8, 11-13 brechen unter der Einwirkung von UV-Licht alle endocyclischen σ-Bindungen auf. Es entstehen die Cycloheptadecaoctaene 15-17. 17 decarboxyliert in Aceton glatt zum kristallinen Cycloheptadecaoctaen (18). Die Kohlenstoffsäuren 15 und 18 bilden in Gegenwart von Basen das [17]Annulenyl-Anion (19). Analoges Verhalten zeigen 20 und 22. Man erhält das gleiche Gemisch von Methyl[17]annulenyl-Anionen (21). Einige Eigenschaften der siebzehn-gliedrigen höheren Vinylogen des Cyclopentadiens und Cyclopentadienyl-Anions werden untersucht.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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