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  • Organic Chemistry  (3)
  • 1980-1984  (3)
  • 1983  (3)
  • 1
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stereochemical course of the intramolecular allylsilane-aldehyde condensation of 1a has been investigated. A modest preference for the product arising from a synclinal orientation of double bonds was observed with Lewis-acid catalysts. Cyclization induced by fluoride ion resulted in stereochemical reversal.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Untersuchungen zur Synthese von 8,15-Dimethylprostanoiden. Allylumlagerung des 15-Alkoxy-15-methyl-prosta-11,13-diensAusgehend von durch mikrobielle Transformation zugänglichem (2S, 3S)-3-Hydroxy-2-methyl-2-(prop-2-inyl)-cyclopentanon (2) wurde der 1,9,15-Tris-(α-ethoxy)ethylether des (15RS)-1,9α,15-Trihydroxy-8,15-dimethyl-prosta-11,13(E)-dien-5-ins (22) in 9 Stufen dargestellt. Hydrolyse dieses Ethers führte zur Allylumlagerung unter Beteiligung des jeweiligen Lösungsmittels: in Ethanol entstand 11-Ethoxy-1,9α-dihydroxy-8,15-dimethylprosta-12,14(E)-dien-5-in (23), während sich in Gegenwart von Essigsäure die entsprechende 11-Acetoxyverbindung (24) bildete.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 770-801 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neutral Ligands with Surfactant-Type Structure - Synthesis, Complexation, and Ion TransferNew lipophilic neutral ligands which combine crown ether and podand characteristics with structural features of surfactants (cf. formulas 1-12, 16-26) were synthesized. Their complexation behaviour was studied, their solid-to-liquid and liquid-to-liquid phase transfer properties as well as their efficiency in ion transport across a liquid model membrane. Crystalline stoichiometric complexes of the cycles 2a-4a and of 3e with NaSCN, Ba(SCN)2, and Bal2 can be isolated. Among the noncyclic representatives a crystalline complex is obtained only from 11 with Bal2. The ligand 8d behaves in aqueous solution as a typical surfactant showing micelle formation and cloud point.
    Notes: Neue Tensid-verwandte, lipophile Neutralliganden vom Kronenether- und Podandtyp (s. Formeln 1-12, 16-26) wurden synthetisiert. Ihre Komplexierungseigenschaften, ihr fest/flüssig- sowie flüssig/flüssig-Phasentransfervermögen für Ionen und ihre Wirksamkeit beim Ionentransport durch eine flüssige Modellmembran wurden untersucht. Von den Cyclen 2a-4a und 3e sind kristalline stöchiometrische NaSCN-, Ba(SCN)2- und Bal2-Komplexe isolierbar. Unter den offenkettigen Tensidliganden konnte nur von 11 ein Komplex mit Bal2 erhalten werden. Der Ligand 8d zeigt in Wasser Tensidcharakter mit Micellbildung und Trübungspunkt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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