18625-12-2

Usage

Uses

Used in Agricultural Industry:
2,4-DB METHYL ESTER is used as a herbicidal agent for controlling broadleaf weeds in crops such as soybeans, peanuts, and alfalfa. It is effective against specific weeds including lambsquarters, pigweed, and velvetleaf, ensuring healthier crop growth and higher yields.
The application of 2,4-DB METHYL ESTER can be done through spraying or soil incorporation, highlighting its versatility in agricultural practices. However, it is crucial to adhere to proper application and safety guidelines to mitigate any potential risks to human health and the environment.

InChI:InChI=1/C11H12Cl2O3/c1-15-11(14)3-2-6-16-10-5-4-8(12)7-9(10)13/h4-5,7H,2-3,6H2,1H3

Upstream product

• 21273-27-8 methyl 2-methyl-3-phenoxybutanoate 

Relevant academic research and scientific papers

Preparation method of chlorophenoxycarboxylic ester

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 chlorophenoxycarboxamide salt

The invention provides a preparation method of chlorophenoxycarboxamide salt, 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, and the catalyst B is C5-22 thiazoles, isothiazoles and thiophenes or halogenated derivatives thereof; and S2) carrying out ammonolysis reaction of chlorophenoxycarboxylic ester and amine to obtain chlorophenoxycarboxamide salt. By redesigning of the process route and fine screening of the catalysts and the chlorinating agent, the method reduces energy consumption, improves chlorination selectivity and avoids loss of effective components. The yield of the obtained chlorophenoxycarboxamide salt can reach 99% or more. At the same time, the production of high-salt wastewater is completely eradicated, thedust hazard caused by drying and use of chlorophenoxycarboxylic acid is avoided, energy is saved and equipment investment is reduced.

Preparation method of chlorophenoxycarboxylic ester

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.

Preparation method of chlorophenoxycarboxylic ester

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.

Preparation method of chlorophenoxycarboxylic ester

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.

A [...] ester preparation method (by machine translation)

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 chlorophenoxycarboxamide salt

The invention provides a preparation method of chlorophenoxycarboxamide salt, 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, and the catalyst B has the following structural formula of R1'-S-R2'; and S2) carrying out ammonolysis reaction of chlorophenoxycarboxylic ester and amine to obtain chlorophenoxycarboxamide salt. By redesigning of the process route and fine screening of the catalysts and the chlorinating agent, the method reduces energy consumption, improves chlorination selectivity and avoids loss of effective components.The yield of the obtained chlorophenoxycarboxamide salt can reach 98.5% or more. At the same time, the production of high-salt wastewater is completely eradicated, the dust hazard caused by drying and use of chlorophenoxycarboxylic acid is avoided, energy is saved and equipment investment is reduced.