Synthetic method of 3, 5-dichloro-2, 4-difluoroaniline

A technology of difluoroaniline and synthesis method, applied in the direction of chemical instruments and methods, amino compound preparation, organic compound preparation, etc., can solve the problems of unavailable raw materials, three wastes, high cost, etc., achieve reduction of three wastes pollution, low cost, avoid The effect of isomers
CN102617360BActive Publication Date: 2013-11-06江西吉翔医药化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
江西吉翔医药化工有限公司
Publication Date
2013-11-06

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Abstract

The invention discloses a synthetic method of 3, 5-dichloro-2, 4-difluoroaniline. The synthetic method takes distillation residues which are generated in the manufacturing technology that 2,6-dichlor fluorbenzene is nitrified to prepare 2, 4-dichloro-3-fluoronitrobenzene as raw material, and the distillation residues are chlorinated through chlorine gas and fluorated through potassium fluoride so as to prepare 3, 5-dichloro-2, 4-difluoro nitrobenzene; and finally, 3, 5-dichloro-2, 4-difluoro nitrobenzene is reduced to obtain 3, 5-dichloro-2, 4-difluoroaniline. The synthetic method adopts by-products that are generated in the conventional manufacturing technology line as raw material, is directly used for synthesizing 3, 5-dichloro-2, 4-difluoroaniline without any treatment, is characterized by low price of raw material, full resource utilization, mild reaction conditions, high yield coefficient of products, low manufacturing cost and the like compared with a conventional method for preparing 3,5-dichloro-2,4-difluoroaniline, is easy to get raw material, and is very suitable for industrialized production.
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Description

technical field

[0001] The invention relates to a new method for synthesizing the intermediate 3,5-dichloro-2,4-difluoroaniline of the insecticide chlorfenuron. Background technique

[0002] 3,5-dichloro-2,4-difluoroaniline is an important intermediate in the synthesis of benzoylurea insecticide teflubenzuron.

[0003] Fufenuron is a benzoylurea insecticide first developed and marketed by Celamerck GmbH & Co. in 1984, and it has been registered for use in many countries in the world. It achieves the purpose of killing pests by inhibiting the synthesis of chitin in the epidermis of insects. Its unique mechanism of action makes it less toxic to humans, animals, and insect natural enemies. It has become an important new generation of insecticides with high efficiency and low toxicity. Insecticide. It still has a good control effect on pests that have developed resistance to organophosphates, pyrethroids, carbamates and other insecticides.

[0004]

[0005] Regarding the s...

Claims

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