PRODUCTION OF 4-AMINO-2,2,6,6-TETRAMETHYLPIPERIDINE AND 2,2,6,6-TETRAMETHYL-4-PIPERIDINE IMINE

PROBLEM TO BE SOLVED: 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. SOLUTION: This 4-amino-2,2,6,6-tetramethylpiperidine of formula I is obtained by reacting 2,2,6,6-tetramet...

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Hauptverfasser:	VOIT GUIDO DR, WITZEL TOM DR, JULIUS MANFRED DR
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: 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. SOLUTION: 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.