- High-efficiency low-pollution fenoxaprop-p-ethyl production process
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The invention discloses a high-efficiency and low-pollution production process of fenoxaprop-p-ethyl. The production process comprises the following specific steps: (1) preparing fenoxaprop-p-ethyl; S1, preparing sulfydryl-6-chlorobenzoxazole; S2, preparing 2,6-dichlorobenzoxazole; and S3, synthesizing the fenoxaprop-p-ethyl. According to the fenoxaprop-p-ethyl, fenoxaprop-p-ethyl is finally synthesized through preparation of sulfydryl-6-chlorobenzoxazole and preparation of 2,6-dichlorobenzoxazole, the technology is simple, operation is convenient, efficiency is high, the speed is high, the production cost is saved, the income is increased, and filter residues generated in the production process can be safely treated through the technology; the waste gas enters a waste gas treatment facility for treatment and is discharged after reaching the standard; and the wastewater is desalted, removed salt is washed and dried by methanol to serve as a byproduct, and evaporated condensate water enters a factory sewage treatment station to be treated, so that the aim of protecting the environment is fulfilled, and the functions of high efficiency and low pollution are achieved.
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- Method for synthesizing herbicide fenoxaprop-P-ethyl (by machine translation)
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An R - (+) 20 - 25 °C (2-hydroxyphenoxy) propionate, an inorganic base, a catalyst and water are added dropwise to obtain a mixed solution; 6 -2 -dichlorobenzoxazole acetone solution is added dropwise to the mixture and stirred at a temperature 4 - to 2 obtain a mixed solution; and the reaction liquid is allowed to stand 70 - 75 °C, dedry and dedry 6 - after being added dropwise to obtain a fenoxaprop-P-ethyl product obtained by mixing 60 - 65 °C-dichlorobenzene and 70 - 75 °C an organic phase 70 - 75 °C. The content of the effective optical isomer in the fenoxaprop-P-ethyl product is 99.9% or more. The acetone is distilled off under normal pressure in the reaction process, and the distilled acetone aqueous solution adopts a membrane separation technology to realize high-purity recovery. (by machine translation)
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Paragraph 0021-0040
(2020/10/14)
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- A new method for one-pot synthesis of aryloxyphenoxypropionate herbicides using 2,4,6-trichloro-1,3,5-triazine and (n-BU)4NI as a homogeneous catalyst
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The one-pot reaction of halo-heterocycle, (R)-4-hydroxyphenoxy propionic acid and an alcohol, amine or sulfonamide is described as an efficient method for the synthesis of aryloxyphenoxy propionate hrerbicides by using 2,4,6-trichloro-1,3,5-triazine in the presence of (n-BU) 4NI, as a homogeneous catalyst under mild conditions. The present procedure offers several advantages, such as good yields, short reaction times and easy workup.
- Kalhor, Mehdi,Dadras, Akbar,Mobinikhaledi, Akbar,Tajik, Hassan
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experimental part
p. 833 - 836
(2012/05/04)
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- PROCESS FOR PREPARING (R)-ARYLOXYPROPIONIC ACID ESTER DERIVATIVES
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The present invention relates to a method for preparing optically active (R)-aryloxypropionic acid ester derivatives, and more particularly to a method for preparing (R)- aryloxypropionic acid ester derivatives with high optical purity and good yield at low cost from phenol derivatives with various substituted functional groups and (S)-alkyl O-arylsulfonyl lactates.
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- Herbicidal esters of D-1-(phenoxy-4-phenoxy)propionic acid
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Optically active enantiomers of the formula I STR1 where R is a group of the formulae STR2 R1 and R2, among others, are halogen or CF3 and Z is a carboxyl, carboxylate, carboxylic acid ester, thioester, carbonamide, carboxylic acid anilide, carbohydrazide or thioamide group, are interesting herbicides the effect of which is considerably superior to that of the optically inactive racemates.
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