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Synthesis of Functional Monosilanes by Disilane Cleavage With Phosphonium Chlorides

Synthesis of Functional Monosilanes by Disilane Cleavage With Phosphonium Chlorides

Tobias Santowski, Alexander G Sturm, Kenrick M Lewis, Thorsten Felder, Max C Holthausen, Norbert Auner

Chemistry. 2019 Mar 12;25(15):3809-3815.

PMID: 30623999

Abstract:

The Müller-Rochow direct process (DP) for the large-scale production of methylchlorosilanes Men SiCl4-n (n=1-3) generates a disilane residue (Men Si2 Cl6-n , n=1-6, DPR) in thousands of tons annually. This report is on methylchlorodisilane cleavage reactions with use of phosphonium chlorides as the cleavage catalysts and reaction partners to preferably obtain bifunctional monosilanes Mex SiHy Clz (x=2, y=z=1; x,y=1, z=2; x=z=1, y=2). Product formation is controlled by the reaction temperature, the amount of phosphonium chloride employed, the choice of substituents at the phosphorus atom, and optionally by the presence of hydrogen chloride, dissolved in ethers, in the reaction mixture. Replacement of chloro by hydrido substituents at the disilane backbone strongly increases the overall efficiency of disilane cleavage, which allows nearly quantitative silane monomer formation under comparably moderate conditions. This efficient workup of the DPR thus not only increases the economic value of the DP, but also minimizes environmental pollution.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1590870	Disilane		1590-87-0	Price

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