Method of preparing malonic acid dialkyl esters
AssigneeDynamit Nobel Aktiengesellschaft
InventorsUwe Prange, Moustafa El Chahawi, Wilhelm Vogt, Hermann Richtzenbain
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Abstract
Production of malonic acid dialkyl esters by reacting halogen acetic acid alkyl ester with carbon monoxide, and alkali metal alcoholate, alkaline earth metal alcoholate or a solution of alkali metal hydroxide in an alcohol at a pH of up to 8.5 in the presence of a cobalt compound which is a catalyst for the reaction.
Claims21
Process of producing a malonic acid dialkyl ester which comprises contacting the corresponding halogen acetic acid alkyl ester with carbon monoxide, and alkali metal alcholate, alkaline earth metal alcoholate or a solution of alkali metal hydroxide in an alcohol at a pH of up to 8.5 in the presence of a catalyst system based on a cobalt salt, Mn powder, and Na.sub.2 S.sub.2 O.sub.4 as catalyst for the reaction, at a temperature of 0.degree. to 150.degree. C. and a carbon monoxide pressure of 0.1-50 atmospheres absolute.
Dependencies are inferred from the claim text.