Process for preparing alkali metal salts of malonic monoalkyl esters
AssigneeDegussa-Huels Aktiengesellschaft
InventorJuergen Muhr
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Abstract
The invention relates to a process for preparing alkali metal salts of malonic monoalkyl esters by selective saponification of malonic dialkyl esters using a basic alkali metal compound which comprises preparing from the malonic dialkyl ester and an alkali metal alkoxide, in a first stage, a CH-acid alkali metal salt of the malonic dialkyl ester and hydrolyzing this in a second stage by the action of water.
Claims14
A process for preparing an alkali metal salt of a malonic monoalkyl ester by selective saponification of a malonic dialkyl ester using a basic alkali metal compound which comprises
- i) reacting a malonic dialkyl ester and an alkali metal alkoxide to form a CH-acid alkali metal salt of said malonic dialkyl ester, wherein said malonic dialkyl ester and said alkali metal alkoxide are used in a molar ratio of from 1:1 to 10:1;
- and
- ii) hydrolyzing said CH-acid alkali metal salt by the action of water.
A process for preparing an alkali metal salt of a malonic monoalkyl ester by selective saponification of a malonic dialkyl ester using a basic alkali metal compound which comprises
- i) reacting a malonic dialkyl ester and an alkali metal alkoxide to form a CH-acid alkali metal salt of said malonic dialkyl ester, wherein said malonic dialkyl ester and said alkali metal alkoxide are used in a molar ratio of from 1.5:1 to 10:1;
- and
- ii) hydrolyzing said CH-acid alkali metal salt by the action of water.
A process for preparing an alkali metal salt of a malonic monoalkyl ester by selective saponification of a malonic dialkyl ester using a basic alkali metal compound which comprises
- i) reacting a malonic dialkyl ester and an alkali metal alkoxide to form a CH-acid alkali metal salt of said malonic dialkyl ester, wherein said malonic dialkyl ester and said alkali metal alkoxide are used in a molar ratio of from 2:1 to 4:1;
- and
- ii) hydrolyzing said CH-acid alkali metal salt by the action of water.
Dependencies are inferred from the claim text.