18-07-2023 дата публикации
Номер: CN116444416A
Принадлежит:
The invention relates to the technical field of pesticide synthesis, in particular to a refining method of cis-3-(2, 5-dimethylphenyl)-4-hydroxy-8-methoxyl-1-azaspiro [4.5] dec-3-ene-2-ketone, and belongs to the technical field of pesticide synthesis. The preparation method comprises the following steps: mixing a cis-3-(2, 5-dimethylphenyl)-4-hydroxy-8-methoxyl-1-azaspiro [4.5] dec-3-ene-2-one crude product with methanol according to a certain ratio, heating and dissolving, adjusting the pH value to 2-3, adding water at a controlled rate, stirring and growing crystals for a period of time, cooling at a controlled rate, stirring and growing crystals for a period of time, filtering, and drying to obtain the cis-3-(2, 5-dimethylphenyl)-4-hydroxy-8-methoxyl-1-azaspiro [4.5] dec-3-ene-2-one. Carrying out suction filtration and drying to obtain a refined product of cis-3-(2, 5-dimethylphenyl)-4-hydroxy-8-methoxy-1-azaspiro [4.5] dec-3-ene-2-ketone, namely the cis-3-(2, 5-dimethylphenyl)-4-hydroxy ...
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