Huels Aktiengesellschaft

Degussa Aktiengesellschaft

Wilfried Latz

Christoph Theis

Frank Bauer

Uwe Prange

Radu Bordeianu

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

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

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.

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Niederkassel, Germany

Wilfried Latz