Preparation of secondary amines

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 209/26 (2006.01) C07C 211/11 (2006.01) C07C 211/36 (2006.01)

Patent

CA 2493538

Disclosed herein is a process for the reductive alkylation of primary amines to form secondary amines, by high pressure reaction of the primary amine with an alkylating agent and hydrogen in the presence of a catalyst which comprises metallic palladium. A process of the present invention is characterized in having high conversion rates and high selectivities, both greater than 95 % on a first pass through the reactor. According to a preferred embodiment, the secondary amine produced comprises at least one 2-alkyl group bonded to the nitrogen atom of the primary amine product.

Cette invention est un procédé d'alkylation avec réduction donnant des amines secondaires à partir d'amines primaires. En l'occurrence, on fait réagir à haute pression l'amine primaire avec un agent d'alkylation et de l'hydrogène en présence d'un catalyseur au palladium métal. Le procédé de l'invention est caractérisé en ce qu'il offre des taux de conversion élevés ainsi que de sélectivités élevées, les uns et les autres supérieurs à 95 %, en une première passe dans le réacteur. Selon un mode de réalisation préféré, l'amine secondaire obtenue comprend au moins un groupe 2-alkyle lié à l'atome azote de l'amine primaire.

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