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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 174 (1973), S. 239-242 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 2255-2274 
    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: The Fries rearrangement of the acetates 2a-c, 3b, 4b, and 4d of six hydroxybenzylphenol derivatives was investigated between 40 and 70°C using AlCl3 as catalyst and nitrobenzene as solvent. Besides the expected main products of the Fries rearrangement also intermediates and products formed by side reactions were isolated by column chromatography, showing the partial saponification of ester bonds to be a probable side reaction. The migration of an acetyl group to the neighbouring phenolic unit of the same molecule could not be observed. All the compounds, including the starting substances, were characterized by their IR- and 1H-NMR-spectra.
    Notes: An den Acetaten 2a-c, 3b, 4b und 4d von sechs Hydroxybenzylphenol-Derivaten wurde die Friessche Verschiebung mit AlCl3 als Katalysator in Nitrobenzol bei Temperaturen zwischen 40 und 70°C durchgeführt. Neben den zu erwartenden Hauptprodukten der Friesschen Verschiebung konnte durch Säulenchromatographie eine Reihe von Zwischen- und Nebenprodukten isoliert werden. Daraus ging hervor, daß wahrscheinlich eine teilweise Verseifung der Acetate als Nebenreaktion stattfindet. Eine Wanderung der Acetylgruppe an den benachbarten Phenolbaustein des gleichen Moleküls konnte nicht beobachtet werden. Sämtliche Verbindungen, einschließlich der Ausgangsprodukte, wurden durch ihre IR- und 1H-NMR-Spektren charakterisiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 1859-1864 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: α-Hydro-ω-hydroxypoly(5-chloro-2-hydroxy-1,3-phenylenemethylene)s (1a, b), the oligomeric condensation products from 4-chloro-2,6-bis(hydroxymethyl)phenol and 4-chlorophenol with hydrochloric acid in 1,4-dioxane, could be completely dehalogenated at room temperature and atmospheric pressure with hydrogene/Raney-Ni. The resulting oligomers 2a, b were esterified with acetic anhydride, and the esters 3a, b were subjected to a oligomer analogous Fries rearrangement to form the linear α-hydro-ω-hydroxypoly(5-acetyl-2-hydroxy-1,3-phenylenemethylene)s 4a and 4b. The characterization of the products was mainly done by spectroscopic methods.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 158 (1972), S. 123-134 
    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: The FRIES rearrangement was investigated with the acetyl derivatives of some phenolic di- and trinuclear compounds. Using nitrobenzene as solvent and AlCl3 as catalyst, all acetyl groups of a molecule can react to form p-hydroxyacetophenone units. Methoxy groups remain unchanged under these conditions. The conversion to o-hydroxyacetophenone compounds, which generally requires higher temperatures, could not be attained until now. All compounds obtained were investigated by means of IR-, UV- and NMR- spectra. They were further characterized by preparing acetyl derivatives and 2.4-dinitrophenylhydrazones.
    Notes: Die FRIES sche Verschiebung wurde an den Acetylderivaten einiger phenolischer Zweiund Dreikernverbindungen untersucht. In Nitrobenzol, mit AlCl3 als Katalysator, ist bei Temperaturen von 40-60°C eine gleichzeitige Umlagerung von mehreren Acylgruppen pro Molekül in die para-Stellung zur phenolischen Hydroxylgruppe ohne Schwierigkeiten möglich. Methoxygruppen bleiben dabei erhalten. Die bei höheren Temperaturen verlaufende Umlagerung in die ortho-Stellung zur phenolischen Hydroxylgruppe gelang jedoch bisher nicht. Die erhaltenen Mehrkernverbindungen mit p-Hydroxyacetophenonbausteinen wurden IR-, UV- und NMR-spektroskopisch untersucht. Sie wurden ferner durch Überführung in die entsprechenden O-Acetylderivate und 2.4-Dinitrophenylhydrazone charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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