Library

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 132 (1970), S. 57-64 
    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: Es wird über die oxydative Kupplungspolymerisation von 2.6-Dimethylphenol mit einem Kupfer(II)-chlorid/Pyridin/KOH-Komplex (alkalischer Kupfer(II)-Komplex) als Katalysator berichtet.Die Konzentratoinen von Kupfer(II)-chlorid, das Verhältnis von Pyridin zu Kupfer(II)-chlorid und das Verhältnis von KOH zu Kupfer(II)-chlorid bestimmen die Ausbeute an Poly(2.6-dimethyl-4.4′-phenylenoxid), dem C—O-Kupplungsprodukt, während die Ausbeute an 3.3′.5.5′-Tetramethyl-4.4′-diphenochinon, dem C—C-Kupplungsprodukt, sich kaum unter den angewendeten Bedingungen verändert.Die Polymerisationsgeschwindigkeit des 2.6-Dimethylphenols war unter Sauerstoff viel größer als unter gewöhnlicher Atmosphäre.Es sei hervorgehoben, daß der durch ESR-Messungen bestimmte Gehalt an Kupfer(II)-Ionen in dem als Katalysator verwendeten alkalischen Kupfer(II)-chlorid-Komplex nur 35 ± 5% beträgt, verglichen mit dem reinen Kupfer(II)-chlorid/Pyridin-Komplex (ohne KOH) als Standard.Die ESR-Messungen zeigen außerdem, daß der alkalische Kupfer(II)-Komplex die Funktion eines Einelektron-Akzeptors hat.
    Notes: The results of the investigation on the oxidative coupling polymerization reaction of 2.6-dimethylphenol in the presence of copper(II) chloride-pyridine-KOH complex (basic copper(II) complex) are reported. The yield of poly(2.6-dimethyl-4.4′-phenylene oxide) which is the C—O coupling product closely depends upon the copper(II) chloride concentration, the ratio of pyridine/copper(II) chloride, and the ratio of KOH/copper(II) chloride. However, the yield of 3.3′.5.5′-tetramethyl-4.4′-diphenoquinone, the C—C coupling product, scarcely changes with these reaction conditions.The rate of polymerization of 2.6-dimethylphenol under oxygen was much larger than that determined in an air atmosphere.The basic copper(II) chloride complex catalyst showed the unusual property that the electron spin resonance-detectable copper(II) ion in the basic copper(II) chloride complex was only 35 ± 5% using pure copper(II) chloride-pyridine complex not containing KOH as a standard.It has been found by means of ESR measurements that the basic copper(II) complex had the function of an one-electron transfer reagent.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...