To obtain 4-amino-2,2,6,6-tetramethylpiperidine from 2,2,6,6- tetramethyl-4-piperidinone by an industrially excellent method in terms of cost by using a specific catalyst.
This 4-amino-2,2,6,6-tetramethylpiperidine of formula I is obtained by reacting 2,2,6,6-tetramethyl-4-piperidinone of formula II with ammonia in the presence of an acidic metal oxide catalyst or a solid acidic catalyst insoluble in a reaction mixture (except an ammonium-type inorganic and organic ion-exchanging substance) to obtain an imine substance of formula III, and subjecting to hydrogen addition in the presence of a hydrogenation catalyst. Preferably, aluminum oxide, silicon dioxide, bentonite, aluminum hydrosilicate of montmorillonite-type, aluminum silicate of erionite-type, etc., is used as the catalyst for obtaining the imine substance by the reaction.
WITZEL TOM DR
JULIUS MANFRED DR
