Process for preparing saturated omega-amino acids

Details Process for preparing saturated omega-amino acids Process for preparing saturated omega-amino acids

C - Chemistry, Metallurgy

07

C

260/526.2

C07C 227/08 (2006.01)

Patent

CA 1128064

A B S T R A C T A process for continuous or batch preparation of an .omega.-amino-acid is described, comprising the imination of an unsaturated aldehyde acid, the catalytic reduction in a single hydrogenation step of the imine of the ethylenically unsaturated straight chain .omega.-aldehyde acid in the presence of ammonia and an alkaline metal hydroxide whereby the alkaline salt of the imine is obtained, and the acidification of the alkaline salt of the .omega.-amino acid. The imine of formyl alkenoic acid is prepared at most at room temperature adding the acid to an ammonia solution of above 10%, then adding NaOH solution to the ammonia solution The reductive imination is effectuated in two steps, first at 100-150°C and the second at 150-180°C under a 20-70 Ate pressure in the presence of a nickel catalyst. High yield and only few by-products are obtained.

347527

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