10443-70-6Relevant articles and documents
Preparation method of phenoxy carboxylic acid herbicide
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, (2019/01/08)
The invention provides a preparation method of a phenoxy carboxylic acid herbicide, comprising the following steps: S1, carrying out a condensation reaction between a phenolic compound and hydroxycarboxylic ester under the action of a catalyst so as to obtain phenoxycarboxylic ester, wherein the catalyst is one or more of protonic acid, solid acid and a supported catalyst; S2, carrying out 2- and/or 4- selecting chlorination reaction between phenoxycarboxylic ester and a chloridizing agent in the presence of a first catalyst and a second catalyst, so as to obtain chlorinated phenoxycarboxylicester, wherein the first catalyst is selected from Lewis acid, and the second catalyst is selected from a C5-C22 thioether compound, a C5-C22 thiazole compound, a C5-C22 isothiazole compound or a C5-C22 thiophene compound; and S3, carrying out an acidolysis reaction on chlorinated phenoxycarboxylic ester so as to obtain the phenoxy carboxylic acid herbicide. By the method, product quality and thelive environment of production can be improved, and ''three wastes (waste gas, waste water and industrial residue)'' are minimized.
A phenoxy carboxylic acid herbicide preparation method (by machine translation)
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Paragraph 0097; 0099, (2019/01/08)
The invention provides a phenoxy carboxylic acid herbicide preparation method, including: S1, will be [...], alkaline substance mixed with the chlorinated carboxylic acid ester, in the one-pot condensation reaction in anhydrous system, phenoxy carboxylic acid ester obtained; the ClR states the chloro- carboxylic acid ester of the formula is1 COOR, R1 Is C1 - 3 alkylene or alkylidene, R is C1 - 10 alkyl or C3 - 10 cycloalkyl; S2, the [...] ester in the 1st and 2nd catalyst under the action of a catalyst, with the chlorinating agent to carry out the selective chlorination of, get [...] ester; the Lewis acid catalyst is selected from 1st, 2nd catalyst is C5 - 22 of the thioether compound, thiazole compound, isothiazole compound or thiophene compound; S3, will the [...] ester to acid hydrolysis reaction, as shown in formula I phenoxy carboxylic acid herbicide, R3 Is H, Cl or CH3 . This invention can improve the quality of the products and the operating environment of production, three waste low. (by machine translation)
Preparation method of phenoxycarboxylic acid herbicide
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Paragraph 0098; 0100, (2019/01/08)
The invention provides a preparation method of a phenoxycarboxylic acid herbicide, wherein the preparation method includes the steps: S1, carrying out condensation reaction of phenol or o-cresol withchlorocarboxylic ester under the action of an alkaline substance to obtain phenoxycarboxylic ester, wherein the chlorocarboxylic ester has the general formula of ClR1COOR, R1 is C1-3 alkylene or alkylidene, and R is C1-10 alkyl or C3-10 cycloalkyl; S2, carrying out selective chlorination of phenoxycarboxylic ester with a chlorinating agent under the action of a first catalyst and a second catalyst, to obtain chlorobenzoxycarboxylic ester, wherein the first catalyst is selected from Lewis acid, the second catalyst is C5-22 thioether compounds, thiazole compounds, isothiazole compounds or thiophene compounds; and S3, carrying out acidolysis reaction of chlorobenzoxycarboxylic ester, to obtain the phenoxycarboxylic acid herbicide represented by the formula I, wherein R3 is H, Cl or CH3. The preparation method can improve the product quality and the operation environment of a production site, and has low quantity of three wastes.
