The anionic oligomerization of hexamethylcyclotrisiloxane with methylmethoxysilanes

✍ Scribed by B.G. Zavin; A.A. Zhdanov; M. Ścibiorek; J. Chojnowski

• Book ID: 103071444
• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 479 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90043-6

✦ Synopsis

The polymerization of hexamethylcyclotrisiloxane (D3) initiated with inorganic and organometallic bases was studied in the presence of methylmethoxysilanes of general formula (MeO),SiMe4_, (n = 1, 2, 3 or 4) as chain transfer agents. In the case of n = 2, 3 or 4, the process can proceed in a specific way leading to the predominant formation of linear oligomers composed of sequences of structure [--(Me)2SiO--]3 (monomer unit) and fragments of one molecule of the methylmethoxysilane. The reaction provides a good method for synthesis of some of these oligomers. The mechanism of the oligomerization is discussed.