17318-08-0Relevant articles and documents
Preparation method of 3,5-dichloro-4-fluorobromobenzene compound
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Paragraph 0047-0052, (2020/12/14)
The invention relates to a preparation method of 3,5-dichloro-4-fluorobromobenzene. According to the preparation method, 2-fluoro-3-chloronitrobenzene is used as a starting raw material and subjectedto bromination, reduction and diazochlorination to synthesize 3,5-dichloro-4-fluorobromobenzene. The whole synthesis route of the method has the advantages of accessible raw materials, mild reaction conditions, environment friendliness, low equipment requirements and high product purity and yield.
Preparation method of 3,5-dichloro-4-fluorobromobenzene compound
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, (2020/12/15)
The invention relates to a preparation method of 3,5-dichloro-4-fluorobromobenzene, which comprises the steps of (1) reacting 2,4-dichloro-3-fluoroaniline with sulfuric acid in the presence of water and glacial acetic acid to obtain 2,4-dichloro-3-fluoroaniline sulfate; (2) adding bromine into the product mixture obtained in the step (1), then dropwise adding hydrogen peroxide, and reacting to obtain 2,4-dichloro-3-fluoro-6-bromoaniline sulfate; and (3) adding sodium hypophosphite and a catalyst copper salt into the product mixture obtained in the step (2), then dropwise adding sodium nitrite,and reacting to obtain 3,5-dichloro-4-fluorobromobenzene. The method is simple in process, low in cost, mild in condition, high in process safety and capable of effectively reducing the use amount ofbromine.