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  • 1
    ISSN: 0887-624X
    Keywords: SiH-containing oligomers ; partial hydrosilylation ; Pt-catalyzed ; hydrocyclotetrasiloxane ; allyloxy (or allyl carbonate) end-blocked oligomers ; NMR analysis ; storage stability ; coordinating compounds ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several organic oligomers (Mw = 103-104 order) containing Si=H bonds of the general formula 1 have been successfully synthesized by platinum-catalyzed partial hydrosilylation reaction of an allyloxy (or an allyl carbonate) end-blocked linear organic oligomer 2 with 2,4,6,8-tetramethylcyclotetrasiloxane, [CH3(H)SiO]4 (3) (hereafter called hydrocyclotetrasiloxane). 1H-NMR spectroscopy confirmed the introduction of hydrocyclotetrasiloxane moiety into the oligomers through Si—C linkage by hydrosilylation reaction. 13C-NMR analysis revealed that the cyclic structure of the starting hydrocyclotetrasiloxane 3 was retained intact in product 1. As the precursor for 1, allyloxy (or allyl carbonate) end-blocked oligomers 2 could be prepared from hydroxyl-terminated oligomers 4. The storage stability of product 1 was significantly influenced by the platinum catalyst still remaining in it. The poor stability was improved by decreasing the amount of the platinum catalyst and/or by adding coordinating compounds. As a result, an excellent stability of product 1 was obtained. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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