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  • 1990-1994  (3)
  • Polymer and Materials Science  (2)
  • Aminyls, heterocyclic  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chemische Kopplung von Polystyrol und Polybutadien in Schmelzemischungen durch Verwendung eines organischen Sulfonylazids (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 204 (1993), S. 177-189 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Investigations on chemical coupling of heterogeneous polystyrene-polybutadiene blends were carried out using an organic sulfonylazide. The coupling process was realized in the melt mixing process on a laboratory melt kneader. The efficiency of the coupling agent was evaluated by IR-spectroscopical, microscopical, and dynamic-mechanical analysis and by mechanical properties of the blends. The graft copolymers forming in the melt cause an increase of the stress-strain properties and the impact strength of the blends.
    Notes: Es wurden Untersuchungen zur chemischen Kopplung heterogener Polystyrol-Polybutadien-Blends bei Einsatz eines organischen Sulfonylazids während des Schmelzemischens im Laborinnenmischer angestellt. Die Wirksamkeit des Kopplungsagens wurde anhand infrarotspektroskopischer, mikroskopischer und dynamisch-mechanischer Analysen sowie anhand des merchanischen Eigenschaftsbildes der Belends beurteilt. Die sich in der Schmelze bildenden Pfropfcopolymeren führen zu einer Erhöhung der Phasenwechselwirkungen un dami zu einer Verbesserung der Festigkeits- und Zähigkeits-eigenschaften der Blends.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052040116
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oxidative Cyclisierung von Anilinopyrazolen zu Pyrazolo[1,5-a]benzimidazolenHerrn Professor Christoph Rüchardt zum 65. Geburtstag gewidmet. (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1729-1733 
    Details
    ISSN: 0009-2940
    Keywords: Pyrazoles ; Aminyls, heterocyclic ; Pyrazolo[1,5-a]benzimidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Free Radical Reactions of N-Heterocyclic Compounds, XIV[1]. - Oxidative Cyclization of Anilinopyrazoles to Pyrazolo[1,5-a]benzimidazolesHerrn Professor Christoph Rüchardt zum 65. Geburtstag gewidmet.Substituted Anilinopyrazoles 1 were oxidized by dibenzoyl peroxide or lead(IV) oxide. Different oxidation products were isolated depending on the substituents in the anilino group of anilinopyrazoles 1. Intermediate pyrazolyl radicals 5, which could be trapped by triphenylmethyl or phenoxyl radicals, undergo cyclization reaction with formation of pyrazolo[1,5-a]benzimidazoles 4. The structures of compounds 4 were proven by 1H- and 13C-NMR spectroscopy, 15N labeling and transformation of 4e to the betain 7e.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270924
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese und Reduktion des Tetra-tert-butyltetraoxocalix[4]arens (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 81-87 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 5,11,17,23-Tetra-tert-butyl-25,26,27,28-tetrahydroxy-2,8,14,20-tetraoxocalix[4]arene (4) was synthesized by oxidation of the tetraacetate of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrahydroxycalix[4]arene (1). Compound 4 was characterized by chemical and spectroscopic methods. Reduction of 4 with hydrazine forms the starting material 1. 4 reacts with sodium borohydride to give 5,11,17,23-tetra-tert-butyl-2,8,14,20,25,26,27,28-octahydroxycalix[4]arene (6).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910106
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    Paper (German National Licenses)
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