Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

Abstract

A process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine by A) reacting triacetonamine (TAA) and malononitrile to afford the intermediate 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile, and B) hydrogenating 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120° C. and at 20-300 bar. In another embodiment, the hydrogenation in step B) of the process is performed in two stages at 20-120° C. and at 20-300 bar.

Dependencies are inferred from the claim text.