Preparation of alkyl (amino) dialkoxysilanes

Details Preparation of alkyl (amino) dialkoxysilanes Preparation of alkyl (amino) dialkoxysilanes

C - Chemistry, Metallurgy

07

F

C07F 7/10 (2006.01) C07F 7/18 (2006.01)

Patent

CA 2322648

Alkyl (amino) dialkoxysilanes are prepared by anhydrously reacting stoichiometric amounts of an alkoxysilane and an alkylamino-magnesium chloride in a reverse addition process. The alkylamino magnesium chloride is preferably prepared in situ by the reaction of a Grignard reagent (RMX) and an alkylamine in a suitable aprotic solvent, such as tetrahydrofuran. The "alkyl" substituent can be alkyl, arylalkyl or aryl. The reaction can be conducted in the temperature range of from 25 °C to 75 °C, without a catalyst, and the aprotic solvent is recovered for re-use in the process.

L'invention concerne des alkyl (amino) dialkoxysilanes obtenus par la réaction anhydre de quantités stoechiométriques d'un alcoxysilane et d'un chlorure d'alkylaminomagnésium dans un procédé par addition inverse. Le chlorure d'alkylaminomagnésium est obtenu de préférence in situ par la réaction d'un réactif Grignard (RMX) et d'une alkylamine dans un solvant aprotique adéquat, notamment un tétrahydofurane. Le substituant "alkyle" peut être alkyle, arylalkyle ou aryle. La réaction peut être menée à bien dans une plage de température comprise entre 25 et 75 DEG C, sans catalyseur et dans des conditions dans lesquelles le solvant aprotique est recouvert en vue d'une réutilisation dans le procédé.

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