Preparation method of methyl ethyl methoxymalonate

A technology of methyl ethyl malonate and methyl methoxyacetate is applied in the field of preparation of methyl ethyl malonate, and can solve the problem of low yield, high energy consumption and unsuitable industrial production. and other problems, to achieve the effect of reducing energy consumption and high yield

Inactive Publication Date: 2015-03-25
CHANGSHU JINSHEN MEDICAL PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing preparation method of methyl ethyl methoxymalonate has low yield and high energy consumption, and is not suitable for industrialized production

Method used

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Examples

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Embodiment Construction

[0011] The specific implementation of the present invention will be further described below in conjunction with the examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0012] The technical scheme of concrete implementation of the present invention is:

[0013] A preparation method of methyl ethyl methoxymalonate, comprising the steps of:

[0014] 1) Put 1.7 parts by mass of diethyl oxalate, 2.4 parts by mass of methyl methoxyacetate and 3.3 parts by mass of solid sodium ethoxide into the reaction kettle, and keep the reaction at 35°C for 3.5 hours;

[0015] 2) Then add 0.7 parts by mass of trichlorethylene, stir and dilute;

[0016] 3) Add 1.3 parts by mass of water and 5.2 parts by mass of 35% hydrochloric acid to separate trichlorethylene;

[0017] 4) The internal temperature was controlled at 85°C, and the water layer was extracted 9 ti...

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Abstract

The invention discloses a preparation method of methyl ethyl methoxymalonate. The preparation method comprises the following steps: 1) putting 1.7 parts by mass of diethyl oxalate, 2.4 parts by mass of methyl methoxyacetate and 3.3 parts by mass of solid sodium ethoxide into a reaction kettle and insulating at 35 DEG C to react for 3.5 hours; 2) then inputting 0.7 part by mass of trichloro ethylene and stirring for diluting; 3) then putting 1.3 parts by mass of water and 5.2 parts by mass of 35% hydrochloric acid and separating out trichloro ethylene; 4) controlling the inner temperature at 85 DEG C, and extracting a water course by trichloro ethylene nine times to recover a trichloro ethylene solvent; and 5) decarbonylating at 145 DEG C for 3-8 hours, and then distilling at a reduced pressure to obtain 3.2 parts by mass of methyl ethyl methoxymalonate. The preparation method of the methyl ethyl methoxymalonate disclosed by the invention is high in yield, and the energy consumption can be greatly reduced, so that the preparation method is suitable for industrial production.

Description

technical field [0001] The present invention relates to the preparation method of methyl ethyl malonate. Background technique [0002] The existing preparation method of methyl ethyl methoxymalonate has low yield and high energy consumption, and is not suitable for industrialized production. Contents of the invention [0003] The purpose of the present invention is to provide a kind of preparation method of methyl ethyl methoxymalonate, its yield is high, and can reduce energy consumption greatly, is suitable for suitability for industrialized production. [0004] For achieving the above object, technical scheme of the present invention is to design a kind of preparation method of methyl ethyl malonate, comprising the steps: [0005] 1) Put 1.7 parts by mass of diethyl oxalate, 2.4 parts by mass of methyl methoxyacetate and 3.3 parts by mass of solid sodium ethoxide into the reaction kettle, and keep the reaction at 35°C for 3.5 hours; [0006] 2) Then add 0.7 parts by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/708C07C67/317
CPCC07C67/317C07C67/333C07C67/54C07C69/708
Inventor 李涛
Owner CHANGSHU JINSHEN MEDICAL PROD CO LTD
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