Synthesis of SiCl4 from Gaseous HCl and Si(OMe)4. Reaction Development and Kinetic Studies

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• 作者：John M. Roberts ; Donald V. Eldred ; Dimitris E. Katsoulis
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：55
• 期：6
• 页码：1813-1818
• 全文大小：304K
• ISSN：1520-5045

文摘

This report describes a method to synthesize SiCl₄ from alkyl orthosilicates and gaseous HCl. Reacting tetramethyl orthosilicate with HCl gas at 0 °C in the presence of a catalytic amount of hexamethyl phosphoramide (10 mol %) and four equivalents of acetonitrile afforded an 86% yield of SiCl₄ after 6 h. Exchange between HCl and alkoxy groups on silicon during the reaction generates methanol. The methanol then reacts with acetonitrile (in the presence of HCl) to form an imidate, thus removing it from the reaction mixture. Other Lewis acid and base catalysts were also observed to accelerate the reaction. A kinetics experiment using ²⁹Si NMR to monitor reaction intermediates in situ was conducted to determine the rates of chloride/alkoxide exchange on silicon.