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Making Use of the Direct Process Residue: Synthesis of Bifunctional Monosilanes |
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| Authors: | Alexander G Sturm Tobias Santowski Julia I Schweizer Dr Lioba Meyer Dr Kenrick M Lewis Dr Thorsten Felder Prof?Dr Norbert Auner Prof?Dr Max C Holthausen |
| Institution: | 1. Institut für Anorganische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt/Main, Germany;2. Momentive Performance Materials, 769 Old Saw Mill River Rd., Tarrytown, NY, 10591 USA;3. Momentive Performance Materials, Chempark, 51368 Leverkusen, Germany |
| Abstract: | The industrial production of monosilanes MenSiCl4?n (n=1–3) through the Müller–Rochow Direct Process generates disilanes MenSi2Cl6?n (n=2–6) as unwanted byproducts (“Direct Process Residue”, DPR) by the thousands of tons annually, large quantities of which are usually disposed of by incineration. Herein we report a surprisingly facile and highly effective protocol for conversion of the DPR: hydrogenation with complex metal hydrides followed by Si?Si bond cleavage with HCl/ether solutions gives (mostly bifunctional) monosilanes in excellent yields. Competing side reactions are efficiently suppressed by the appropriate choice of reaction conditions. |
| Keywords: | bifunctional monosilanes density functional calculations direct process residue disilane cleavage silanes |