Preparation method of chlorantraniliprole and chlorantraniliprole

CN120247813APending Publication Date: 2025-07-04SOUTH CHINA AGRICULTURAL UNIVERSITY
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Patent Information

Application Number
CN202510197548.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

The existing chlorine-sensitive production processes have problems such as unstable chlorine gas inlet, solvent medium problems, unstable droplet addition of furfural and cumbersome operations, resulting in low production efficiency and high cost, making it difficult to meet the needs of large-scale applications.

Method used

Dichloropyridazinone, p-toluenesulfonic acid, urea and sulfolane are used as raw materials. By adding urea in batches and using sulfolane as solvent, traditional high-pressure operation is avoided, combined with ethanol and 1,2-dichloroethane treatment is simplified, and the post-treatment steps are improved, and the reaction efficiency and product purity are improved.

Benefits of technology

It has achieved efficient production of chlorine-grass sensitive, with product purity up to 97%, few by-products, suitable for large-scale applications, reducing production costs and operation difficulties.

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Abstract

The invention relates to the technical field of herbicides, in particular to a preparation method of chlorantraniliprole and the chlorantraniliprole, the method comprises the following steps: step 1, adding dichloropyridazinone, p-toluenesulfonic acid and a first part of urea into sulfolane, uniformly mixing, heating to 160-170 DEG C, and adding a second part of urea to obtain a reactant; step 2, cooling the reactant to room temperature, adding water into the reactant, separating out a white solid, continuously stirring, then carrying out suction filtration, washing with water, collecting and drying the washed white solid, so as to obtain a chlorantraniliprole crude product; step 3, adding an ethanol aqueous solution into the chlorantraniliprole crude product, heating, stirring and refluxing for 1-3 hours, and then cooling, suction-filtering and drying the chlorantraniliprole crude product to obtain first chlorantraniliprole; 4, 1, 2-dichloroethane is added into the first chlorantraniliprole, heating and stirring are conducted for 1-3 h, then the first chlorantraniliprole is cooled, subjected to suction filtration and dried, and a chlorantraniliprole product is obtained.The preparation method of the chlorantraniliprole can efficiently produce the chlorantraniliprole and has the advantages of being low in cost and easy to operate.
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Citation Information

Patent Citations

  • Preparation method of 3-phenyl-4-6-dichloropyridazine

    CN106831600A

  • Pyridazinone derivatives

    CN1232026A

  • selective herbicide

    DE1196423B

  • Process for the preparation of 4-nitro-chloro- or 5-bromo-pyridazones-6

    FR1413606A

  • Pyridazinone derivatives

    US4954499A

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