The selective synthesis of di- and cyclosiloxanes bearing several hidden p-tolyl-functionalities
作者:Irina K. Goncharova、Sergey P. Kutumov、Roman A. Novikov、Tatyana Yu. Shiryaeva、Alexander D. Volodin、Alexander A. Korlyukov、Ashot V. Arzumanyan
DOI:10.1016/j.jorganchem.2022.122482
日期:2022.11
This study reports the development of a selective method for the synthesis of p-tolylsiloxanes, namely, symmetrical disiloxanes and cyclotetrasiloxanes, by hydrolytic condensation of p-tolyl-containing mono(ethoxy)silanes and di(ethoxy)silanes in the presence of [Me4N]+OH–. The reaction occurs under mild and simple reaction conditions: at 30 °C, under atmospheric pressure, in 1–5 h, in acetone and
本研究报告开发了一种选择性合成对甲苯基硅氧烷的方法,即对称二硅氧烷和环四硅氧烷,通过在 [Me 4 N] + OH – . 反应在温和且简单的反应条件下发生:在 30 °C 下,在大气压下,在 1-5 小时内,在丙酮和乙醇介质中或在块(无溶剂)中,负载量为 0.25-5 mol.% (每个 Si-OEt 组)的 [Me 4 N] + OH –,一种可商购且便宜的催化剂。该方法具有很好的可扩展性,并允许以 42-85% 的收率获得以克量(最多 50 g)为单位的目标产物(2a-f)。使用一组物理化学分析方法确认结构:IR、ESI-HRMS、GPC、3a 和 4a 1 H/ 13 C/ 29 Si NMR 和 X 射线。