cis-trans-cis-Tetrabromotetramethylcyclotetrasiloxane:: A versatile precursor of ladder silsesquioxanes
cis-trans-cis-Tetrabromotetramethylcyclotetrasiloxane:: A versatile precursor of ladder silsesquioxanes
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DOI：
10.1246/bcsj.78.1105
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发表时间：
2005-06-15
影响因子：
4
通讯作者：
Matsumoto, H
中科院分区：
文献类型：
--
作者：
Unno, M;Chang, SH;Matsumoto, H
首次通过包括环四硅氧烷脱苯溴化的新方法分离出标题化合物。通过与二苯基硅烷二醇缩合，得到反三环[7.3.1.1(3.7)]六硅氧烷，证实了四溴化物的立体结构。该四溴化物在空气中自发分解，得到不溶于有机溶剂的白色粉末。产物的TG、IR和固态NMR谱的测量表明，获得了具有高热稳定性和立构规整性的梯形聚倍半硅氧烷。
The title compound was isolated for the first time by a novel procedure including dephenylbromination of cyclotetrasiloxane. The stereostructure of the tetrabromide was confirmed by condensation with diphenylsilanediol, affording anti-tricyclo[7.3.1.1(3.7)]hexasiloxane. This tetrabromide spontaneously decomposed in air to afford a white powder insoluble in organic solvents. Measurements of the TG, IR, and solid-state NMR spectra of the product revealed that a ladder polysilsesquioxane with high thermal stability and stereoregularity was obtained.