- Preparation method of 3, 5-dichloro-4-fluorobromobenzene compound
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The invention relates to a preparation method of 3, 5-dichloro-4-fluorobromobenzene. The method takes 2, 6-dichlorofluorobenzene as a raw material, the raw material is simple and easy to obtain, the cost is low, the method is simple in process, mild in condition and environment-friendly, the separation and purification of an intermediate product 2, 4-dichloro-3-fluoronitrobenzene through a crystallization method are much more efficient than those of the traditional distillation means, and the process safety is high. The loss is lower.
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Paragraph 0044-0046
(2020/12/29)
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- Preparation method of 3, 4, 5-trifluorobromobenzene
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The invention relates to a preparation method of 3, 4, 5-trifluorobromobenzene, belongs to the technical field of chemical synthesis, and solves the problem that a byproduct 3, 4, 5-trichloronitrobenzene generated in a process of preparing 3, 4-dichloronitrobenzene by introducing chlorine into parachloronitrobenzene cannot be effectively utilized. The method comprises the step of preparing 3, 4, 5-trifluorobromobenzene by taking 3, 4, 5-trichloronitrobenzene as a raw material. According to the technical scheme provided by the invention, the utilization rate of raw materials and the efficiencyof the process can be improved, and high-value utilization of byproducts is realized.
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Paragraph 0100-0101; 0106; 0110
(2020/12/14)
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- Preparation method of 2, 3, 4-trifluoronitrobenzene
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The invention belongs to the field of organic synthesis, and particularly relates to a preparation method of 2, 3, 4-trifluoronitrobenzene. The method comprises the following steps: reacting 2,6-dichlorofluorobenzene as a raw material with HNO3/H2SO4 so as to obtain 2, 6-dichloro-3-nitrofluorobenzene, and then reacting the 2, 6-dichloro-3-nitrofluorobenzene with anhydrous potassium fluoride to obtain the 2, 3, 4-trifluoronitrobenzene. The method disclosed by the invention is high in yield, simple in synthesis and suitable for industrial production.
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Paragraph 0011
(2019/05/15)
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- By means of a micro channel reactor synthesis of 2,4-dichloro-3-fluoro-nitrobenzene method (by machine translation)
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The present invention discloses a synthetic 2,4-dichloro-3-fluoro-nitrobenzene method, in the high flux micro-channel reactor is completed in 2,6-dichlorofluobenzene the course of the reaction and mixed, continuous nitration reaction can be carried out, w
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Paragraph 0084-0086
(2017/03/08)
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