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  • 1
    ISSN: 0093-691X
    Keywords: anestrous season ; embryos ; pFSH-PVP ; sheep ; superovulation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 1015-1015 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    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: 4.4′-bis-(4-carboxy-3-amino-phenoxy)-diphenylsulphone is obtained from 4.4′-dichlorodiphenylsulphone and the dipotassium salt of 5-hydroxy-anthranilic acid in dimethyl sulphoxide and reacted with aromatic dicarboxylic acid chlorides in polar solvents such as N-methylpyrrolidone (NMP) or N.N-Dimethylacetamide(DMA) to yield high molecular weight polyamides with free carboxyl groups. These polyamide carboxylic acids can be converted into high molecular weight polybenzoxazinones in NMP with the addition of dehydration agents such as thionyl chloride, phosphorus oxychloride or phosphorus pentoxide. N-aryl substituted polyquinazolones of particularly good solubility in organic solvents are prepared therefrom with aromatic amines. N-aryl substituted triazole-modified polybenzimidazoles are likewise obtained from 3.5-bis-(4-arylamino-3-aminophenyl)-4-aryl-1.2.4-triazoles and aromatic dicarboxylic acid chlorides in NMP with subsequently heating the open chain polyamide amines with splitting off water. The cyclisation reactions are discussed by means of infra-red spectra.
    Notes: Aus 4.4′-Dichlordiphenylsulfon und dem Dikaliumsalz der 5-Hydroxy-anthranilsäure in Dimethylsulfoxid wurde 4.4′-Bis-(4-carboxy-3-amino-phenoxy)-diphenylsulfon erhalten und in polaren Lösungsmitteln wie N-Methylpyrrolidon (NMP) oder N.N-Dimethylacetamid (DMA) mit aromatischen Dicarbonsäurechloriden zu hochmolekularen Polyamiden mit freien Carboxylgruppen umgesetzt. Diese Polyamid-carbonsäuren ließen sich in NMP unter Zusatz von Dehydratisierungsmitteln wie Thionylchlorid, Phosphoroxidchlorid oder Phosphorpentoxid in hochmolekulare Polybenzoxazinone überführen. Mit aromatischen Aminen wurden daraus N-arylsubstituierte Polychinazolone mit besonders guter Löslichkeit in organischen Lösungsmitteln hergestellt. Ebenfalls N-arylsubstituierte Triazolmodifizierte Polybenzimidazole wurden aus 3.5-Bis-(4-arylamino-3-aminophenyl)-4-aryl-1.2.4-triazolen und aromatischen Dicarbonsäurechloriden in NMP mit nachfolgendem Erhitzen der offenkettigen Polyamid-amine unter Wasserabspaltung erhalten. Die Ringschlußreaktionen werden an Hand von IR-Spektren erörtert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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