The anionic oligomerization of hexamethylcyclotrisiloxane with methylmethoxysilanes |
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| Affiliation: | 1. Department of Neurology, Centro Hospitalar e Universitário de Coimbra, Portugal;2. Department of Neuroradiology, Centro Hospitalar e Universitário de Coimbra, Portugal;1. Department of Molecular Medicine, University of Padova, 35121 Padua, Italy;2. Fondazione Banca degli Occhi del Veneto, 30174 Venice, Italy;1. Apáczai Csere János School of the ELTE University, Papnövelde u. 4. H-1053 Budapest, Hungary;2. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary;3. Institut UTINAM (CNRS UMR 6213), Université Bourgogne Franche-Comté, 16 route de Gray, F-25030 Besançon, France;4. Institute of Chemistry, University of Miskolc, Egyetemváros A/2, H-3515 Miskolc, Hungary;5. Department of Chemistry, Eszterházy Károly University, Leányka u. 6, H-3300 Eger, Hungary |
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| Abstract: | The polymerization of hexamethylcyclotrisiloxane (D3) initiated with inorganic and organometallic bases was studied in the presence of methylmethoxysilanes of general formula (MeO)nSiMe4−n (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. |
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