Synthesis of chloromethyldisilanes
OwnerRoy G. Gordoninventor
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Abstract
1,2 Dichloro-1,1,2,2-tetramethyldisilane is synthesized in high yield and good purity starting from a crude mixture of chloromethyldisilanes formed as by-products in the manufacture of silicones. The new method uses less than half as much Grignard reagent as previous methods required. The synthesis can also be used to produce other haloalkyldisilanes such as chloropentamethyldisilane or 1,1,2 trichloro-1,2,2-trimethyldisilane.
Claims22
A process for synthesizing chloromethyldisilanes starting from the disilane fraction resulting from the direct process for the manufacture of silicones, said process comprising the steps of
- (a) reacting said disilane fraction with a methylating agent to form hexamethyldisilane and
- (b) reacting said hexamethyldisilane with a further portion of said disilane fraction to form a chloromethyldisilane product.
A process for making a haloalkyldisilane product from a mixture of disilanes, which mixture comprises a mixture of trialkyl- and dialkylhalogenated disilanes, said process comprising the steps of
- (a) reacting said mixture with an alkylating agent to form a hexa-alkyldisilane and
- (b) reacting said hexa-alkyldisilane with a further portion of said mixture stoichiometrically selected to form said haloalkyldisilane product.
Dependencies are inferred from the claim text.