Preparation method of 2,4-dichloro-5-isopropoxy aniline salt

Abstract

The invention discloses a preparation method of 2,4-dichloro-5-isopropoxy aniline salt. The preparation method is characterized by comprising the following steps of: generating 2,4-dichloro-5-isopropoxy aniline by using 2,4-dichloro-5-isopropoxy nitrobenzene in the presence of polar solvent and water and under the reaction action of stannous chloride, sodium sulfide, sodium sulfite or sodium hyposulfate, adding aromatic hydrocarbon or chloroalkene solvent serving as an extracting agent, extracting, washing, acidifying, filtering, drying, and thus obtaining the 2,4-dichloro-5-isopropoxy aniline salt. Because the reducing agent, the polar solvent and the water are used in the reaction, risk is reduced in the production process of a production workshop, the environment is protected, massive iron cement is not produced, and the aniline salt reaches national standard. Therefore, the method is more reasonable in synthesis process, low in cost and high in quality, and is more suitable for industrialized production.

Description

technical field [0001] The present invention relates to the preparation method of selective pre-emergence and post-emergence herbicides of protoporphyrinogen oxidase inhibitors, especially an intermediate 2,4-dichloro-5-isopropoxyaniline salt of oxadiazone Preparation. Background technique [0002] Oxadiazon is a protoporphyrinogen oxidase inhibitor selective pre-emergence and post-emergence herbicide variety. In 1963 it was found to be a new compound with significant herbicidal activity. Afterwards, a large number of experiments have been carried out in laboratories, greenhouses and fields in many countries in the world, all of which have proved that its efficacy is good. It is suitable for rice, cotton, soybean, sugarcane, sunflower, peanut and various tuber crops or transplanted crops. It can be applied before or after emergence, and it mainly controls grasses and broad-leaved weeds. It has been registered for use in paddy fields in Brazil, Bulgaria, Colombia, Ecuador,...

AI Technical Summary

Problems solved by technology

However, the reduction of iron powder produces a large amount of iron sludge and acidic water vapor, and the production environment is very harsh and labor-intensive, which has become a flaw in the above-mentioned process.

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