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Production process of flumioxazin herbicide

A technology for the production process of flumechlor propargyl, which is applied in the field of the production process of flumechlor propargyl herbicide, can solve the problems of difficult separation, many by-products, high prices, etc., and achieve the effect of reducing pollution and reducing the cost of raw materials

Pending Publication Date: 2021-06-29
宁夏一帆生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing fluramid herbicides use 2-nitro-5-fluorophenol or difluorobenzene as raw material, 2-nitro-5-fluorophenol is expensive, and difluorobenzene is used as raw material. There are many by-products in the medium, and it is difficult to separate them

Method used

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Embodiment 1

[0014] A kind of production technology of propargyl flufenamide herbicide, comprises the following steps:

[0015] S1. Synthesis of 2-nitro-5-fluorophenol: Add water to the reaction kettle, then add 2,4-difluoronitrobenzene, add potassium hydroxide solution at 50°C, and stir for 6 hours after filling , and cooled to room temperature, the aqueous layer was neutralized to weak acidity with hydrochloric acid, extracted with cyclohexane, stirred, allowed to stand for layers, combined organic phases, and solvent removal to obtain 2-nitro-5-fluorophenol as a yellow solid;

[0016] Synthesis of S2, 2-(5-fluoro-2-nitrophenoxy) ethyl acetate: 5-fluoro-2-nitrophenol, ethyl bromoacetate, K 2 CO 3 , N-dimethylformamide was added to the reaction kettle, stirred at room temperature for 5 hours, the reaction solution was poured into ice water, precipitated, filtered with suction, washed with water, and dried to obtain light yellow solid 2-(5-fluoro-2-nitrate phenylphenoxy) ethyl acetate; ...

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Abstract

The invention discloses a production process of a flumioxazin herbicide. The process is characterized by comprising the following steps: S1, synthesizing 2-nitro-5-fluorophenol; S2, synthesizing ethyl 2-(5-fluoro-2-nitrophenoxy) acetate; S3, synthesizing 7-fluoro-2H-1, 4-benzoxazine-3 (4H)-ketone; S4, synthesizing 7-fluoro-6-nitro-2H-1, 4-benzoxazine-3 (4H)-ketone; S5, synthesizing 7-fluoro-6-amino-2H-1, 4-benzoxazine-3 (4H)-ketone; S6, synthesizing 7-fluoro-6-(3, 4, 5, 6-tetrahydro)phthalimido-1, 4-benzoxazine-3 (4H) ketone; and S7, synthesizing the flumioxazin. The method has the advantages of low raw material price, few byproducts and light pollution.

Description

technical field [0001] The invention relates to the technical field of herbicide production technology, and specifically refers to a production technology of flufenflufen propargyl herbicide. Background technique [0002] Flurafen propargyl is a herbicide absorbed by young shoots and leaves. It can effectively control annual broad-leaved weeds and some grass weeds when used as soil treatment. It is easy to degrade in the environment and is safe for subsequent crops. Soybeans and peanuts have good resistance to it. Corn, wheat, barley, rice are moderately tolerant. It is suitable for controlling annual broad-leaved weeds and some gramineous weeds in soybean, peanut, orchard and other crop fields. Most of the existing fluramid herbicides use 2-nitro-5-fluorophenol or difluorobenzene as raw material, 2-nitro-5-fluorophenol is expensive, and difluorobenzene is used as raw material. There are many by-products in the medium, and the separation is more difficult. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D413/04
CPCC07D413/04
Inventor 吴克崇王学胜
Owner 宁夏一帆生物科技有限公司
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