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  • Articles  (2)
  • Inorganic Chemistry  (2)
  • Abstützung
  • Analytical Chemistry and Spectroscopy
  • Apparat
  • General Chemistry
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  • Schneckendosierer
  • Wiley-Blackwell  (2)
  • 1985-1989
  • 1980-1984  (2)
  • 1955-1959
  • 1980  (2)
Document type
  • Articles  (2)
Keywords
  • Inorganic Chemistry  (2)
  • Abstützung
  • Analytical Chemistry and Spectroscopy
  • Apparat
  • General Chemistry
  • +
Publisher
  • Wiley-Blackwell  (2)
Years
  • 1985-1989
  • 1980-1984  (2)
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 941-954 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Statistical Syntheses of RotaxanesThe acetalisation of the 28-membered cyclic diols 11a, b with the long-chain dibromo ketone 12 gives acetals 13a, b. These compounds react with triphenylmethyllithium to give 17a, b and 18a, b from which the rotaxanes 20a, b are obtained in 0.066 or 0.18 and 0.12% yield, respectively, after hydrolysis of the acetal bonds. The reacetalisation of rotaxane 20b affords, by an intraannular reaction, the prerotaxane 18b in pure form.
    Notes: Die Acetalisierung der 28-gliedrigen cyclischen Diole 11a, b mit dem langkettigen Dibromketon 12 ergibt die Acetale 13a, b. Nach Umsetzung mit Triphenylmethyllithium zu 17a, b und 18a, b werden nach Hydrolyse der Acetalbindungen die Rotaxane 20a, b in Ausbeuten von 0.066 und 0.18 bzw. 0.12% als farblose Öle isoliert. Durch Reacetalisierung von 20b wird in einer intraannularen Reaktion das Prärotaxan 18b in reiner Form erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reductive Cleavage of 2,2-Dialkyl-1,3-benzodioxole Derivatives with Diisobutylaluminium Hydride. Synthesis of a [2]-Catenane having a 22-Membered MacroheterocycleThe reductive cleavage of the title compounds 1 with diisobutylaluminium hydride in refluxing benzene or toluene affords, after hydrolysis, pyrocatechol derivatives 8 and a mixture of alkenes 6 and alkanes 7. When the reaction is performed at room temperature, the pyrocatechol monoalkyl ethers 4 are obtained after hydrolysis. Starting from the precatenane 9, the catenane 12 having a 22-membered macroheterocycle is synthesised in a reaction sequence of several steps.
    Notes: Die reduktive Spaltung der Titelverbindungen 1 mit DIBAH in siedendem Benzol oder Toluol ergibt nach Hydrolyse Brenzcatechin-Derivate 8 und ein Gemisch von Alkenen 6 und Alkanen 7. Die Reaktionsführung bei Raumtemperatur ergibt Brenzcatechin-monoalkylether 4. Ausgehend von dem Praecatenan 9 wird in einer mehrstufigen Reaktionsfolge das Catenan 12 mit einem 22-gliedrigen Makroheterocyclus synthetisiert.
    Type of Medium: Electronic Resource
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