ISSN:
0941-1216
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Metalorganic Synthesis of Modified Polycarbosilanes. I. Benzylidene Bridged PolycarbosilanesBy single step reaction of the monomeric silanes diphenyl-, phenylmethyl, dimethyl-, methyl-vinyl- and methyldichlorosilanes with α,α-dibromotoluene as carbosilane bridge builder and magnesium as reducing agent a series of modified linear polycarbosilanes was prepared. This new synthetic route - a simple variation of the Grignard method - allowed the synthesis of the oligomeric products in large amounts. In addition, the sensitive functional groups SiH and SiCH = CH2 were completely preserved during the course of the reaction, in contrast to the direct synthesis with sodium as reductive agent.The structures of the viscous polycarbosilanes were characterized by a highly rate of alternating Si-C-systems.The modified polycarbosilanes were analysed and investigated by IR-, 1H-, 13C- and 29Si-NMR-spectroscopy. The weight and number averages Mw and Mn, which were determined by gel-permeation chromatography, clearly reflected the oligomeric character of these compounds.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/prac.19933350110
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