Evonik Degussa Gmbh

Sanofi-aventis

Daniel Dembkowski

Volker Brehme

Manfred Neumann

Rolf Schneider

Matthias Seiler

Michael Keup

Jörn Rolker

Lothar Schwink

Benjamin Willy

Axel Kobus

Hermann Winkler

Wolfgang Benesch

Daniel Witthaut

Stefanie Rinker

Alexander Schraven

Jochen Niemeyer

Muhammad Irfan

Thomas Riethmann

Gunther Schmalz

David Sucunza

Janna Velder

Jorn Rolker

In a method of absorbing COfrom a gas mixture the use of an absorption medium comprising water and at least one amine of formula (I) 

[object Object]

COis absorbed from a gas mixture by contacting the gas mixture with an absorption medium which comprises at least water as solvent and at least one amine of formula (I) where Ris an aliphatic radical, having 2 to 6 carbon atoms and at least one amino group, and Ris hydrogen, a Calkyl radical or a radical R.

Amine-containing absorption medium, process and apparatus for absorption of acidic gases from gas mixtures

4-amino-2,2,6,6-tetramethylpiperidine is prepared by reacting 2,2,6,6-tetramethylpiperidine-4-one with ammonia and hydrogen in the presence of nickel and/or cobalt catalyst and water. The main reaction is carried out at a pressure of at most 50 bar and a temperature of at most 120&#xb0; C. up to a conversion of the 2,2,6,6-tetramethylpiperidine-4-one of at least 80%. Then, an after-reaction takes place at a higher temperature and at a higher pressure compared to the pressure and temperature of the main reaction.

Process for the preparation of 4-amino-2,2,6,6-tetramethylpiperidine

The present invention relates to a process for preparing mumbaistatin derivatives (I), where the anthraquinone skeleton is constructed via a Diels-Alder reaction and the central methylene bridge via a transition metal-catalyzed reaction, and to the intermediates used in this process. 

Method for the production of mumbaistatin derivatives

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Essen, Germany

Daniel Dembkowski