Huels Aktiengesellschaft

Dynamit Nobel Aktiengesellschaft

Degussa Aktiengesellschaft

Huls Aktiengesellschaft

Degussa-huels Aktiengesellschaft

Creanova Spezialchemie Gmbh

Marcel Feld

Wolfgang Kleemiss

Manfred Kaufhold

Frank Bauer

Josef Metz

Juergen Muhr

Hermann Richtzenhain

Klaus-Dieter Steffen

Clemens Osterholt

Guenther Koehler

Gunter Zoche

Udo Jegelka

Guenter Zoche

Jurgen Muhr

Bruno Klotz-Berendes

Marcus Bongen

Friedrich Goerentz

J Urgen Muhr

Cyclopropanecarboxylates of lower alcohols are prepared by esterification of the corresponding cyclopropanecarboxylic acids with the corresponding lower alcohols in the presence of an acid catalyst, while maintaining a considerable stoichiometric excess of the cyclopropanecarboxylic acid with respect to the lower alcohol, keeping the temperature at from 100 to 200&deg; C. and distilling off the cyclopropanecarboxylate together with the water of reaction and small amounts of alcohol. Cyclopropanecarboxylates of lower alcohols are valuable intermediates in the pharmaceutical and agrochemical sectors.

Process for preparing cyclopropanecarboxylates of lower alcohols

Enantiomerically enriched malonic acid monoesters substituted by a tertiary hydrocarbon radical, and their preparation

A process for preparing potassium monoethyl malonate by selective saponification of malonic acid diethyl ester with potassium hydroxide, in which the potassium hydroxide is added to the malonic acid diethyl ester, malonic acid diethyl ester and potassium hydroxide are used in a molar ratio of at least 1.5 and the potassium hydroxide is effectively distributed into the malonic acid diethyl ester.

Process for preparing potassium monoethyl malonate

Process for the preparation of amino acid derivatives

A three-stage process for removing mercury contaminants from alcoholic alkali metal alkoxide solutions is provided, in which mercury is depleted in a first filtration through inert fibrous material, followed by a second filtration through pulverized coal, and then by concentration by distillation, to preferably provide a mercury content below 0.1 ppm.

Process for removing mercury from alkali metal alkoxide solutions

The invention relates to a process for the preparation of methoxyacetic acid esters in which a chloroacetic acid ester is reacted with an alkali metal methoxide to give the methoxyacetic acid ester.

Process for the preparation of methoxyacetic acid esters

The invention relates to a process for the preparation of a macrocyclic ester of the general formula: in which m is an integer from 6 to 14 and n is an integer from 2 to 12.

Process for the preparation of macrocyclic esters

Cyclopropylamine is prepared from butyrolactone by a process comprising:

Process for the preparation of cyclopropylamine

A process for nitrosating C-H-acidic compounds. The process substantially avoids producing polluted wastewater.

Process for nitrosation of C-H-acidic compounds

The invention relates to a process for the preparation of aminomalonic acid esters and optionally their salts by the catalytic hydrogenation of a substituted malonic acid ester in an inert solvent, and optionally by the addition of an acid to the hydrogenation mixture. The process comprises carrying out the hydrogenation in the presence of a solid dehydrating agent and a solvent or solvent mixture in which the aminomalonic acid ester salt is substantially insoluble.

Process for the preparation of aminomalonic acid ester salts

A process for the preparation of aminoacetic acids or aminoacetonitriles with a tertiary hydrocarbon radical in the .alpha.-position in which monoamide derivatives of malonic acid are subjected to a Hofmann rearrangement.

Process for the preparation of aminoacetic acids with a tertiary

A process for preparing hydroxymethylcyclopropane, in which formylcyclopropane is hydrogenated over copper chromite, zinc chromite and/or copper/zinc catalysts. The process may be batchwise or continuous.

Process for preparing hydroxymethylcyclopropane

Process for the preparation of macrocyclic compounds by condensation of at least difunctional compounds and subsequent thermal depolymerization in the presence of catalysts, wherein thermal depolarization is carried out in solvent of the formula ##STR1## where R.sup.1 and R.sup.2 represent identical or different aliphatic C.sub.1-6 hydrocarbon radicals with or without functional groups and having number average molecular weights (Mn) from 500 to 3,000, from which the value of n inevitably follows, at a pressure of less than 50 hPa and at a temperature of 200 to 300.degree. C., 5 to 1,000 parts by weight of solvent being used per part by weight of macrocyclic compound.

Process for the continuous preparation of macrocyclic compounds

The invention relates to a novel process for the simultaneous preparation of cyclopropyl alkyl ketones and 4,5-dihydroalkylfurans from 3-acyltetrahydrofuran-2-ones using a metal salt according to the diagram ##STR1## In the reaction, N-alkyllactams and/or N-acylmorpholines which are high-boiling and only slightly miscible with water are used. By charging the solvent, the metal salt and the 3-acyltetrahydrofuran-2-one in a molar excess with respect to the metal salt, heating the mixture to 160.degree. to 220.degree. C. and metering in further 3-acyl-tetrahydrofuran-2-one, the desired products are obtained in high yields. The metal salt can moreover be recovered in a simple manner by washing with water.

Growing community of inventors

Cologne, Germany

Marcel Feld