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US 4,291,167 AGranted
Preparation of tetramethyldisilane from 1,2-tetramethyldichlorodisilane
AssigneeNalco Chemical Company
InventorsRonald J. Allain, Joseph P. Maniscalco
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Abstract
A process of producing tetramethyldisilane by reacting tetramethyldichlorodisilane with a reducing mixture of NaH and NaBH.sub.4 in the presence of a complexing ether such as the diethyl ether of tetraethylene glycol.
Claims5
A process of producing TMDS by:
- (a) reacting purified TMDCDS with a substoichiometric mixture of NaH and NaBH.sub.4 in the presence of a complexing ether solvent to produce TMDS and a BH.sub.3.ether complex, and
- (b) adding incrementally additional substoichiometric amounts of NaH to the reaction mixture obtained from step (a) to react with the BH.sub.3.ether complex to produce NaBH.sub.4, and
- (c) allowing the thus-formed NaBH.sub.4 to react in situ with the remaining TMDCDS to produce TMDS and a BH.sub.3.ether complex, and
- (d) continuing the sequence of steps (b) and (c) until fully stoichiometric amounts of NaH have been added to the reaction mixture of step (a), so as to complete the reaction converting TMDCDS to TMDS, and
- (e) separating and recovering the thus-formed TMDS and recovering and recycling the ether solvent and the unreacted NaH and NaBH.sub.4 reactants.
2 more elements
Dependencies are inferred from the claim text.