Cassella Aktiengesellschaft

Hoechst Aktiengesellschaft

Manfred Schrod

Wolfgang Bauer

Eckard Kujath

Gerhard Zoller

Friedrich Engelhardt

Karl-Heinz Keil

Reinhard Donges

Uwe Nickel

Herbert Wille

Manfred Ziegelmayer

Josef Hilbig

Klaus Delpy

Richard Bicker

Hans Militzer

Wolfgang Rybczynski

Georg-Wolfgang Eckhardt

Eberhard Grimm

Wolfgang Rrbczynski

Method of preparing 1-amino-2, 6-dimethylpiperidine

The present invention relates to a process for the preparation of pyrrole derivatives of the general formula I ##STR1## by reaction of a compound of the general formula III ##STR2## where R, R.sup.1 and R.sup.2 are defined as specified in claim 1, in a Vilsmeier reaction. The reaction is carried out in an easily degradable solvent, the reaction product is isolated with the aid of a water-miscible extractant and is purified by high-vacuum distillation in the short path evaporator.

Process for the preparation of pyrrole derivates

The present invention relates to a process for the preparation of benzothioxanthene dyestuffs and cyclisation of 3-(2'-aminophenylthio)-benzanathrones wherein the diazotisation and cyclisation are carried out simultaneously in polar, aprotic solvent in the presence of water.

Process for the preparation of benzothioxanthene dyestuffs

Process for the preparation of 1-(acylaminoalkyl)-2-imidazolines

Cyanogen halides and/or phosgene are removed from waste gases by bringing the waste gases into intimate contact with an aqueous solution of at least one amine of the formula NR.sub.3 ; in the formula, 1 or 2 of the radicals R represent an alkanol or alkylamine group having 2 or 3 carbon atoms in each case, where H and/or C.sub.1 -C.sub.2 -alkyl is bound to the nitrogen of the amine group, and the remaining groups R are H or C.sub.1 -C.sub.4 -alkyl.

Process for removing cyanogen halides and phosgene from waste gases

A polymer hydrogel substantially free from monomers and oligomers is prepared by contacting a previously prepared polymer hydrogel with a single-phase mixture of water and a solvent and then separating the mixture of water and solvent from the hydrogel.

Process for the preparation of a hydrogel which is largely free from

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Weiterstadt, Germany

Manfred Schrod