Degussa Aktiengesellschaft

Huels Aktiengesellschaft

Dynamit Nobel Aktiengesellschaft

Degussa-huels Aktiengesellschaft

Christoph Theis

Uwe Prange

Wilfried Latz

Manfred Neumann

Frank Bauer

Andreas Harthun

Radu Bordeianu

Elmar Wolf

Wilhelm Vogt

Josef Metz

Hermann Peeters

Hans Henniges

André Noppe

Gudrun Fickert

Stephan Bruhn

Hans-Juergen Pitz

Stefan Bruhn

4-alkylpyrimidine is produced by reacting formamide with a formyl methyl alkyl ketone diacetal without the addition of water at a temperature that allows removal of the 4-alkylpyrimidine from the reaction mixture by distillation. The process is readily applicable on an industrial scale and succeeds without the addition of water or ammonium chloride as a catalyst and permits the production of 4-alkylpyrimidine in good yields and excellent purities without time-consuming extraction steps.

Process for the production of 4-alkylpyrimidine

An alkali metal alkoxide or alkaline earth metal alkoxide in granular form.

Granular akali metal alkoxides and alkaline earth metal alkoxides

Transition metals may be recovered from a salt-containing mixture containing at least one transition metal compound, salts, and organic compounds by separating from the salt-containing mixture a mixture of the transition metal compound and the salts. This mixture, together with any organic impurities, is introduced into a combustion zone, and the flue gas/salt mixture leaving the combustion zone is quenched with water. The combustion residue, containing the transition metal, is separated from the resulting quench solution, dried, and converted to fresh catalyst.

Process for recovering catalyst transition metals from salt-containing reaction mixtures

A process for preparing malonic diesters by carbonylation of haloacetic esters and reaction with monohydric alcohols and a base in the presence of a transition metal catalyst, preferably a catalytic cobalt carbonyl complex, using a stirred reactor with one or more internal heat exchangers. The stirred reactor preferably contains a sparging stirrer.

Process for preparing malonic diesters in a reactor with internal heat exchangers

1,1-cyclopropanedicarboxylic diesters are prepared from malonic diesters, 1,2-dihaloethane and alkali metal carbonate in the presence of a mixture of available or in situ-produced phase transfer catalyst and polyalkylene glycol or derivatives thereof which are capped at one or both ends, in particular those with ether end groups, where the molar ratio of malonic diester: 1,2-dihaloethane: alkali metal carbonate is 1:(1 to 7):(1 to 1.4).

Process for the preparation of 1,1-cyclopropanedicarboxylic diesters

A process for the preparation of guanine, by reacting 2,4-diamino-5-formylamino-6-hydroxypyrimidine (DAFHP) with formic acid, in the absence of formalize. The process may be conducted with the addition of water and at reflux temperature.

Process for the preparation of guanine

A process for preparing guanine, in which 2,4-diamino-5-formylamino-6-hydroxypyrimidine (DAFHP) in formic acid is reacted at superatmospheric pressure, optionally in the absence of formamide and/or in the presence of catalytic amounts of an additive which acts as a reducing agent.

Process for preparing guanine under superatmospheric pressure

2-Aryl-2-chloramalonic diester is prepared by reacting 2-arylmalonic diesters with aqueous hypochlorite in the presence of an inert solubilizer at pH 8 to 14.

Process for preparing 2-aryl-2-chloromalonic diesters

(Cyclo)aliphatic polyisocyanates are provided which are completely or partially blocked with malonic esters, the malonic ester containing at least one tert-butyl group. The blocked polyisocyanates may be deblocked at a reduced temperature.

Blocked polyisocyanates and a process for their preparation

An olefin copolymer is prepared by copolymerizing ethylene, an .alpha.-olefin and, optionally a diene having non-conjugated double bonds by solution polymerization in the presence of:

Process for preparing ethylene copolymers

Arylacetaldehyde-dialkylacetals are prepared with high yields and selectivity from the corresponding chloromethylaromatics in the presence of hydrogen chloride acceptors and methyl carbonyl compounds as catalysts and in the presence of orthoesters as water-binding agents by hydroformylation with carbon monoxide and hydrogen.

Process for the preparation of arylacetaldehyde-dialkylacetals

Cyanacetaldehyde acetals, which can be substituted at the alpha carbon atom, form in a high yield and purity by the transposition of the appropriately substituted 3-alkoxy-nitriles with alcohols in the presence of basic catalysts from the group of the alcoholates of the alkali or alkaline earth metals, followed by deactivation of the catalyst. Short reaction times and high yields combined with a minimum production of byproducts are achieved by the continuous performance of the transposition in the continuous-flow reactor.

Method for preparing cyanacetaldehyde acetals

Enol ethers of the formula ##STR1## and/or the corresponding acetals can be obtained from acyloxymethylene compounds of the corresponding structure by reaction with the corresponding alcohol, in the presence of acid catalysts if desired.

Method of preparing acetals and enol ethers from acyloxymethylene

3-Alkoxy acrylonitriles are obtained directly from the corresponding nitriles by reaction of carbon monoxide and alcoholates followed by reaction with organic halides.

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Niederkassel, Germany

Christoph Theis