Evonik Degussa Gmbh

Huels Aktiengesellschaft

Huels Atiengesellschaft

Evonik Operations Gmbh

Guenter Kreilkamp

Manfred Neumann

Benjamin Willy

Udo Jegelka

Jochen Niemeyer

Michael Keup

Gerhard Thelen

Felix Nissen

Stefan Frentzen

Beatrix Vom Bruch

Sabine Schering

Gerhard Bachstaedter

An N-substituted triacetonediamine compound is prepared by reacting 4-amino-2,2,6,6-tetramethylpiperidine or a derivative thereof with a carbonyl compound in a reductive amination, wherein reductive conditions are established by conducting the reaction in the presence of hydrogen and in the presence of a supported catalyst, wherein the supported catalyst includes at least one metal M, wherein the metal M is selected from the group consisting of V, Cr, Mo, Mn, Ni, Pd, Pt, Fe, Ru, Os, Co, Rh, Ir, and Cu.

Synthesis of triacetonediamine compounds by reductive amination proceeding from triacetonediamine and derivatives thereof

An N-methyl-substituted triacetonamine compound is prepared by reacting at least one triacetonamine compound (I) with formaldehyde under reductive conditions, in the presence of hydrogen and in the presence of a supported catalyst, wherein the supported catalyst contains at least one metal M, wherein the metal M is selected from the group consisting of V, Cr, Mo, Mn, Ni, Pd, Pt, Fe, Ru, Os, Co, Rh, Ir, and Cu.

Process for preparing an N-methyl-substituted triacetonamine compound

N-monosubstituted 4-aminopiperidine is prepared by a process comprising, in a single stage, continuously passing a 4-oxopiperidine and a primary amine over a metal hydrogenation catalyst under a hydrogen partial pressure of 1-500 bar at a LHSV of up to 1 hr.sup.-1.

Continuous process for preparing 4-aminopiperidines

A process for the continuous preparation of 4-amino-2,2,6,6-tetramethylpiperidine (TAD), comprising: passing triacetoneamine, ammonia and hydrogen over a catalyst of at least two layers in a reactor, wherein at least one catalyst layer comprises at least one element of the 4th, 5th, or 6th row of the 8th transition group of the Periodic Table or combinations of these metal elements on a suitable support, where the catalyst content with respect to each individual catalytically active element changes independently from the reactor inlet to the reactor outlet.

Continuous process for the preparation of

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Marl, Germany

Guenter Kreilkamp