Method for synthesizing 3,4-dimethoxythiophene

A technology of dimethoxythiophene and methoxythiophene, which is applied in the field of synthesizing 3,4-dimethoxythiophene, can solve the problems of environmental pollution, low product yield, high production cost, etc., and achieve reduction of environmental pollution, reaction The effect of low temperature and high utilization rate
CN107954976AActive Publication Date: 2018-04-24贝利科技(重庆)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
贝利科技(重庆)有限公司
Publication Date
2018-04-24

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Abstract

The invention relates to a method for synthesizing 3,4-dimethoxythiophene. The method comprises steps as follows: S1, 2,5-dimethyl dicarboxylate-3,4-sodium thiophene diol and dimethyl sulfate are subjected to a heating reaction in an organic solvent, and 3,4-dimethoxythiophene-2,5-dimethyl dicarboxylate is obtained; S2, 3,4-dimethoxythiophene-2,5-dimethyl dicarboxylate is subjected to the heatingreaction with strong base in an alkylbenzene organic solvent with the boiling point not lower than 200 DEG C, then strong acid is added for acidification, and 3,4-dimethoxythiophene-2-formic acid is obtained; S3, 3,4-dimethoxythiophene-2-formic acid is subjected to a reduced-pressure heating reaction in a long-chain amine organic solvent with the boiling point not lower than 300 DEG C, and 3,4-dimethoxythiophene is obtained. The method is low in production cost, low in energy consumption and high in product yield, the organic solvents can be recycled, particularly, no catalyst is used in the step of decarboxylation, so that the cost is greatly reduced, and environmental pollution is reduced.
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Description

Technical field

[0001] The invention relates to a method for synthesizing 3,4-dimethoxythiophene and belongs to the technical field of chemical industry. Background technique

[0002] As a good conductive polymer monomer, 3,4-dimethoxythiophene is expensive and has attracted much attention in recent years. The current industrial production methods mainly include: (1) using 3,4-dibromothiophene and sodium methoxide as raw materials to synthesize 3,4-dimethoxythiophene under catalyst conditions, but the raw material synthesized by this route is 3,4- Dibromothiophene is more expensive and has higher production costs; (2) react with diacetyl, trimethyl orthoformate and concentrated sulfuric acid to generate 2,3-dimethoxy-1,2-butadiene, and then add sodium acetate It reacts with sulfur dichloride to form a ring-forming product, but this route still has the disadvantages of relatively expensive raw materials and high production costs, and the treatment of the waste sulfuric acid ...

Claims

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