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Making Use of the Direct Process Residue: Synthesis of Bifunctional Monosilanes
Alexander G Sturm1, Tobias Santowski1, Julia I Schweizer1
1Institut für Anorganische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438, Frankfurt/Main, Germany.
Abstract:
The industrial production of monosilanes Men SiCl4-n (n=1-3) through the Müller-Rochow Direct Process generates disilanes Men Si2 Cl6-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.
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