1713-12-8Relevant articles and documents
A phenoxy carboxylic acid herbicide preparation method (by machine translation)
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, (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 chlorophenoxycarboxylic ester
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Paragraph 0103; 0105; 0109; 0111, (2019/01/08)
The invention provides a preparation method of chlorophenoxycarboxylic ester, wherein the preparation method includes the following steps: S1) carrying out 2-site and/or 4-site selective chlorinationreaction of phenoxycarboxylic ester with a chlorinating agent under the action of a catalyst A and a catalyst B to obtain chlorophenoxycarboxylic ester, wherein the catalyst A is Lewis acid, the catalyst B has the following structural formula of R1'-S-R2', and the phenoxycarboxylic ester has any structure represented by the formulas I-IV; and S2) carrying out transesterification reaction of chlorophenoxycarboxylic ester and alcohol under the action of a catalyst to obtain long-chain chlorophenoxycarboxylic ester, wherein the alcohol has the molecular formula of R2OH, and R2 is C4-20 alkyl or cycloalkyl. The method improves the yield and purity of chlorophenoxycarboxylic ester by redesigning of the process route and fine screening of the catalysts and the chlorinating agent. The content ofthe obtained chlorophenoxycarboxylic ester can reach 98.5% or more and the yield can reach 98.5% or more.
Preparation method of chlorophenoxycarboxylic ester
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Paragraph 0092; 0094, (2019/01/08)
The invention provides a preparation method of chlorophenoxycarboxylic ester, wherein the preparation method includes the following steps: S1) carrying out 2-site and/or 4-site selective chlorinationreaction of phenoxycarboxylic ester with a chlorinating agent under the action of a catalyst A and a catalyst B to obtain chlorophenoxycarboxylic ester, wherein the catalyst A is Lewis acid, the catalyst B is C5-22 thiazoles, isothiazoles and thiophenes or halogenated derivatives thereof, and the phenoxycarboxylic ester has any structure represented by the formulas I-IV; and S2) carrying out transesterification reaction of chlorophenoxycarboxylic ester and alcohol under the action of a catalyst to obtain long-chain chlorophenoxycarboxylic ester, wherein the alcohol has the molecular formula ofR2OH, and R2 is C4-20 alkyl or cycloalkyl. The method improves the yield and purity of chlorophenoxycarboxylic ester by redesigning of the process route and fine screening of the catalysts and the chlorinating agent. The content of the obtained chlorophenoxycarboxylic ester can reach 98.5% or more and the yield can reach 98.5% or more.