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  • 1
    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: Ein auf Magnesiumoxid aufgebrachter Polytitazan-Cobalt (III)-Komplex diente als effektiver Katalysator für die Epoxidierung von cis-Cycloocten mit molekularem Sauerstoff bei Normaldruck in Gegenwart von Isobutyraldehyd als Reduktionsmittel. Nach XPS-Untersuchungen wird Cobalt (III) durch den mehrzähnigen Stickstoffliganden des Polytitazans stabilisiert. Bei 25°C beträgt der cis-Cycloocten-Umsatz nach fünf Stunden 95,2%, mit einer Selektivität von 100% für das cis-Cyclohexylenoxid. Der Katalysator Kann mindestens neun Mal ohne Aktivitätsverlust verwendet werden.
    Notes: Magnesium oxide supported polytitazane cobalt (III) complex is demonstrated as an effective catalyst for the epoxidation of cis-cyclooctene with molecular oxygen at atmospheric pressure in the presence of isobutyraldehyde as the sacrificial reductant. XPS data show that the high-valent cobalt (III) is stabilized by the multidentate nitrogen ligand of polytitazane. The conversion of cis-cyclooctene is as high as 95.2% with 100% selectivity to the cis-cyclooctene oxide at 25°C within 5 h. The catalyst can be used at least nine times without loss of its activity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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