Preparation method of 3,4-ethylene dioxy thiophene

Abstract

The invention relates to a preparation method of organic matter, in particular to a preparation method of 3,4-ethylene dioxy thiophene.With chloracetate as the initial raw material, 3,4-ethylene dioxy thiophene is preparated through vulcanization reaction, condensation, etherification, saponification and decarboxylic reaction.The method is easy to operate, low in cost, safe, environmentally friendly, high and stable in product yield, good in product color and luster, simple in process during reaction, not strict in reaction condition and quite suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing organic matter, in particular to a method for preparing 3,4-ethylenedioxythiophene. Background technique [0002] Polyethylenedioxythiophene (PDEOT) is a new type of organic conductive luminescent material, which has the advantages of high conductivity, good environmental thermal stability, easy film production and good transparency. It is widely used in antistatic packaging materials, solar cells, Supercapacitor plastic antistatic coating, sensors and other electronic equipment. Due to its unique electrical and optical properties and wide range of applications, the development of reasonable and efficient high-quality polyethylene dioxythiophene suitable for industrial production has increasingly become the direction of efforts of various companies. [0003] As a monomer for the preparation of polyethylenedioxythiophene, 3,4-ethylenedioxythiophene (DEOT) is a colorless to light yellow transparent body,...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many papers at home and abroad to report the synthetic method of EDOT and its intermediates. The starting raw material is mainly thiodiglycolic acid, and its esterification yield is generally partial, and the cost of raw materials is relatively high. Pressure distillation is used to purify thiodiglycolic acid ester, otherwise the impurities will affect the quality of EDOT products, the color is poor, and it is difficult to purify into high-purity grades, which are suitable for the increasingly demanding electronic product industry

In addition, there are many reaction steps (CN101591345B, CN101429205B) and the frequent transfer of reaction materials affects the yield, and increases the cost and unnecessary labor and energy consumption for industrialization

KeegstraMA et al. proposed to use 3,4-dibromothiophene as the starting material to prepare 3,4-ethylenedioxythiophene. This method is expensive, the reaction conditions are harsh, and the product yield is low, so it is only suitable for laboratories.