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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 82 (1965), S. 32-40 
    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: Die Initiierung der Acetaldehydpolymerisation mit \documentclass{article}\pagestyle{empty}\begin{document}$${\rm Al}({\rm C}_2 {\rm H}_5 )_3\ {\rm oder}\ ({\rm C}_2 {\rm H}_5 )_2 \ {\rm AlOCH}({\rm CH}_3 ){\rm C}_2 {\rm H}_5\ ({\rm I})$$\end{document} als Katalysator wurde gasanalytisch und gaschromatographisch untersucht. Es wurde festgestellt, daß Al(C2H5)3 unter den Polymerisationsbedingungen zuerst mit Acetaldehyd zu (I) reagierte. Danach wurde die Polymerisation durch die sec-Butoxygruppe, nicht durch die Äthylgruppe initiiert; 2 Äthylgruppen von (I) blieben während der nachfolgenden Polymerisation unangegriffen. Beide Katalysatoren schienen daher ein ähnliches aktives Produkt zu ergeben. Sie unterschieden sich jedoch in der Stereospezifität, was auf die unterschiedliche Aggregation von (I) zurückgeführt wurde.
    Notes: The initiation of the acctaldehyde polymerizations with \documentclass{article}\pagestyle{empty}\begin{document}$${\rm Al}({\rm C}_2 {\rm H}_5 )_3\ {\rm or}\ ({\rm C}_2 {\rm H}_5 )_2 \ {\rm AlOCH}({\rm CH}_3 ){\rm C}_2 {\rm H}_5\ ({\rm I})$$\end{document} catalysts were studied by gasometry and gas chromatography. It was found that Al(C2H5)3 first reacted with acetaldehyde to give (I) under the polymerization condition. Then the polymerization was initiated by the sec-butoxyl group, but not by the ethyl group; 2 ethyl groups of (I) remained unreacted during the following polymerization. Therefore, the active species of these two catalysts seem to be similar. However, they were found to differ in stereospecificity which was ascribed to the degree of aggregation of species (I).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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