1,1,2,2-Tetramethyl-3-trimethylsilyl-1,2-disilacyclobutane: synthesis and spontaneous polymerization |
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| Authors: | L. E. Gusel’nikov V. V. Volkova E. N. Buravtseva N. V. Ushakov V. G. Lakhtin L. A. Parshkova E. A. Chernyshev |
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| Affiliation: | 1. A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prosp., 119991, Moscow, Russian Federation
2. State Research Institute of Chemical Technology of Organoelement Compounds, 38 sh. Entuziastov, 111123, Moscow, Russian Federation
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| Abstract: | Gas-phase dehalogenation of 1,2-bis[chloro(dimethyl)silyl]-2-trimethylsilylethane with alkali metals gave 1,1,2,2-tetramethyl-3-trimethylsilyl-1,2-disilacyclobutane (3). Its spontaneous ring-opening polymerization at room temperature afforded an amorphous linear polymer with T g = ?8.9°C, M w = 3.47·105–3.85·105, and M w /M n = 2.43—2.86. According to spectroscopic data (IR and 1H, 13C, and 29Si NMR), the backbone of the polymer consists of alternating monomer units joined in the “head-to-tail” ([Me2SiCH(SiMe3)CH2SiMe2SiMe2CH-(SiMe3)CH2SiMe2]) and “head-to-head” ways ([Me2SiCH2CH(SiMe3)SiMe2SiMe2CH-(SiMe3)CH2SiMe2]). |
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