3035-67-4Relevant academic research and scientific papers
Synthesis method of substituted phenoxyacetate compound
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Paragraph 0053; 0054; 0055; 0077-0082, (2019/08/01)
The invention discloses a synthesis method of a substituted phenoxyacetate compound, relates to a synthesis method of a compound and aims to solve the problems that during current preparation of the substituted phenoxyacetate compound by a condensation method, a large amount of organic agent is consumed, substituted phenol is unlikely to react completely, the content of free phenol in three wastesis high and a very high environmental risk exists. According to the synthesis method, after the substituted phenol is mixed with haloacetate, a condensation reaction is performed in a potassium fluoride system condensing agent under the synergistic catalysis of a phase transfer catalyst and a halogenated hydrocarbon activator to obtain a substituted phenoxyacetic acid compound. The synthesis method is applied to the field of compound synthesis.
A method for preparing 2, 4 - dichlorophenoxyacetic acid (by machine translation)
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Paragraph 0012; 0097; 0099; 0100, (2018/09/08)
The invention provides a 2, 4 - dichlorophenoxyacetic acid preparation method, comprises the following steps, first alcohol and a halogenated acetic acid after the reaction, to obtain halogenated acetate; the 2, 4 - dichlorophen after reaction with the alkali, to obtain 2, 4 - II [...]; then the above-mentioned step to obtain the halo acetate with 2, 4 - dichlorophen salt, to obtain 2, 4 - dichlorophenoxy ester; then obtained the above-mentioned step 2, 4 - dichlorophenoxy ester hydrolytic reaction, to obtain the 2, 4 - dichloro acid and alcohol; finally the above-mentioned step returns mellowly obtained is used in the aforesaid step, recycling; the alcohol is C atom number greater than or equal to 2 alcohol. The invention adjusts the process route, from the improved on the basis of, the reaction process is cleaning, of the small amount of waste water, hydrolysis few by-products, high purity of the product, the conversion and yield higher; and process raw materials can be recycled, is suitable for large-scale industrial production. (by machine translation)
Preparation method of chlorophenoxycarboxylic ester
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Paragraph 0071; 0073; 0075; 0077; 0078; 0080; 0099; 0101, (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 0088; 0090, (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.
A phenoxy carboxylic acid ester herbicide preparation method (by machine translation)
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, (2019/01/08)
The invention provides a phenoxy carboxylic acid ester herbicide preparation method, including: S1, phenol in the presence of alkaline substance with the chlorinated carboxylic acid ester condensation reaction, phenoxy carboxylic acid ester obtained; the ClR states the chloro- carboxylic acid ester of the general formula1 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 the presence of a catalyst, with the chlorinating agent to carry out the selective chlorination of, get [...] ester; the Lewis acid catalyst is selected from the 1st, the 2nd catalyst is C5 - 22 of the thioether, thiazole, thiophene compounds or different benzisothiazoles; S3, will the [...] ester with an alcohol reaction, as shown in formula I phenoxy carboxylic acid ester herbicide; R3 Is H, Cl or CH3 , R ' is a C4 - 20 alkyl or cycloalkyl. This invention can improve the product quality and the production environment, three waste low. (by machine translation)
Preparation method of 2,4-dichlorophenoxyacetic ester
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, (2019/01/08)
The invention provides a preparation method of 2,4-dichlorophenoxyacetic ester, wherein the preparation method includes the following steps: S1) carrying out a reaction of phenol and methyl chloroacetate under alkaline conditions to obtain methyl phenoxyacetate; S2) carrying out selective chlorination reaction of methyl phenoxyacetate with a chlorinating agent under the action of a catalyst A anda catalyst B to obtain 2,4-methyl dichlorophenoxyacetate, wherein the catalyst A is Lewis acid, and the catalyst B is C5-22 thioethers, thiazoles, isothiazoles and thiophenes or halogenated derivatives thereof; and S3) carrying out transesterification reaction of 2,4-methyl dichlorophenoxyacetate and alcohol under the action of a catalyst, to obtain 2,4-dichlorophenoxyacetic ester, wherein the alcohol is C2-20 alcohol. The selective chlorination reaction is carried out with methyl phenoxyacetate as a raw material, the selectivity of the reaction is improved, the loss of effective components isavoided, the yield of the effective components is greatly improved, and the three-waste treatment capacity, the three-waste treatment difficulty and the treatment cost are reduced.
Preparation method of chlorophenoxycarboxylic ester
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Paragraph 0061; 0062, (2019/01/06)
The invention provides a preparation method of chlorophenoxycarboxylic ester, wherein the preparation method includes the following steps: carrying out 2-site and/or 4-site selective chlorination reaction 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, and the catalyst B is C5-22 thiazoles, isothiazoles and thiophenes or halogenated derivatives thereof. The method effectively improves the chlorination selectivity and avoids loss of effective ingredients 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 99% or more.
Preparation method of chlorophenoxycarboxylic ester
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Paragraph 0072; 0073, (2019/01/08)
The invention provides a preparation method of chlorophenoxycarboxylic ester, wherein the preparation method includes the following steps: carrying out 2-site and/or 4-site selective chlorination reaction 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, and the catalyst B has the following structural formula of R1'-S-R2'. The method effectively improves the chlorination selectivity and avoids loss of effective ingredients 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 99% or more.
A [...] ester preparation method (by machine translation)
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Paragraph 0056; 0057, (2019/01/08)
The invention provides a method for preparing [...] ester, including: the phenoxy carboxylic acid ester compounds, supported Lewis acid catalyst, sulfur-containing polymer mixed with the chlorinating agent, the selective chlorination reaction, to obtain [...] ester. Compared with the prior art, this invention uses benzene oxygen suo acid ester compound as a raw material obtained by the selective chlorination of [...] ester, simple preparation method, to avoid having the bad smell of the Fe0 production and use, thereby fundamentally preventing the substance to the dioxin generation; at the same time supported Lewis acid and sulfur-containing polymer common as catalyst, through the two cooperative positioning function, the selectivity of the dichloride to improve, and the two can through the filter recovery and re-use, the use of the recycling of the catalyst; furthermore the invention avoids the losses of the active ingredient, the extraction rate of the product, reduces energy consumption, prevent high COD, the generation of high salt waste water, three waste output has been largely reduced. (by machine translation)
Preparation method of 2,4-dichlorophenoxyacetic acid and salt thereof
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Paragraph 0099; 0101, (2019/01/06)
The invention provides a preparation method of 2,4-dichlorophenoxyacetic acid and a salt thereof, wherein the preparation method includes the following steps: S1) carrying out a reaction of phenol andchloracetic ester under alkaline conditions to obtain phenoxyacetic ester; S2) carrying out selective chlorination reaction of the phenoxyacetic ester with a chlorinating agent under the action of acatalyst A and a catalyst B to obtain 2,4-dichlorophenoxyacetic ester, wherein the catalyst A is Lewis acid, and the catalyst B is C5-22 thioethers, thiazoles, isothiazoles and thiophenes or halogenated derivatives thereof; and S3) carrying out hydrolysis reaction of 2,4-dichlorophenoxyacetic ester under acidic conditions to obtain 2,4-dichlorophenoxyacetic acid; or after 2,4-dichlorophenoxyaceticester is obtained, carrying out an alkaline hydrolysis reaction with an alkaline compound to obtain 2,4-dichlorophenoxyacetate. The production and use of 2,4-dichlorophenol with unpleasant odor are avoided, the production of dioxins is eliminated, the yield of products is improved, and the output of three wastes is greatly reduced.
