Abstract

Synthesis of monomers is the key and most labor-consuming step in the development of highly selective membrane materials. Polyalkylenesiloxanes show promise for separation of vapors of organic components from gas mixtures. The paper considers two approaches to the synthesis of 1,1,3,3,5,5-hexamethyl-2-oxa-1,3,5-trisilacyclohexane, a monomer for preparing poly-bis(dimethylsilmethylene)dimethylsiloxane, a promising polymer material for gas-separation and pervaporation membranes. Modified synthesis procedures using both approaches, closure of the six-membered ring via formation of the Si–O–Si or Si–C bond, are suggested. Comparative analysis shows that, among organomagnesium cyclization methods, the one-step method in a diethyl ether or diethyl glycol dibutyl ether should be preferred. The suggested procedure allows reaching the monomer yield as high as 75–80% and more.

中文翻译：

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有望用于膜材料的单体，聚亚烷基硅氧烷的合成

摘要

单体的合成是开发高选择性膜材料的关键和最费力的步骤。聚亚烷基硅氧烷显示出从气体混合物中分离出有机组分蒸气的希望。本文考虑了两种方法合成1,1,3,3,5,5-六甲基-2-氧杂-1,3,5-三硅烷基环己烷（一种用于制备聚双（二甲基硅亚甲基）二甲基硅氧烷的单体）用于气体分离和全蒸发膜的材料。建议使用两种方法进行改进的合成程序，即通过形成Si–O–Si或Si–C键来封闭六元环。对比分析表明，在有机镁环化方法中，在二乙醚或二甘醇二丁醚中的一步法应是优选的。