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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2413-2435 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: An kritisch verzweigten Polykondensaten aus 1,3,5-Benzoltriessigsäure und 1,10-Decandiol wurden Lichtstreuungsmessungen ausgeführt. Die Ergebnisse wurden in Anlehnung an die Theorie der Kaskadenprozesse analysiert; diese Theorie wurde, mit Hilfe der Methode der “path-weighting” (Weg-wichtenden) erzeugenden Funktion, speziell für dieses System umgeformt. Es wird postuliert, daß das Ausmaß der Kettenexpansion bei diesen verzweigten Proben im wesentlichen auf Nachbarschafts- (“short range”) Wechselwirkungen und weniger auf weitreichende (“long range”) Wechselwirkungen zurückzuführen ist. Die weitreichenden Wechselwirkungen scheinen im kritisch verzweigten Zustand zu verschwinden. Für die Berechnung der vergleichbaren ungestörten Dimensionen des linearen Homologen aus 1,3-Benzoldiessigsäure und 1,10-Decandiol wurde das Modell der rotationisomeren Zustände herangezogen.
    Notes: Light-scattering measurements were carried out on critically branched polycondensates of 1,3,5-benzenetriacetic acid and 1,10-decanediol, and the results were analysed according to the theory of cascade processes, developed especially for this system, viz. the pathweighting generating function method. It is postulated that the amount of chain expansion found in these branched copolycondensate samples was due to short-range rather than long-range interactions. The long-range interactions seem to vanish in the critically branched state. The rotational isomeric state model was used to calculate the comparative unperturbed dimensions for the linear homologue of the above polycondensate, i.e. poly(1,3-benzenediacetic acid/1,10-decanediol).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 20 (1982), S. 531-538 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2017-06-02
    Description: The tricyclic diterpene fungal metabolite (+)-pleuromutilin has served as a starting point for antibiotic development. Semisynthetic modification of its glycolic acid subunit at C14 provided the first analogs fit for human use, and derivatization at C12 led to 12- epi -pleuromutilins with extended-spectrum antibacterial activity, including activity against Gram-negative pathogens. Given the inherent limitations of semisynthesis, however, accessing derivatives of (+)-pleuromutilin with full control over their structure presents an opportunity to develop derivatives with improved antibacterial activities. Here we disclose a modular synthesis of pleuromutilins by the convergent union of an enimide with a bifunctional iodoether. We illustrate our approach through synthesis of (+)-12- epi -mutilin, (+)-11,12-di- epi -mutilin, (+)-12- epi -pleuromutilin, (+)-11,12-di- epi -pleuromutilin, and (+)-pleuromutilin itself in 17 to 20 steps.
    Keywords: Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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