- Method for preparing 4 - amino -3 and 6 - dichloro pyridine formic acid by electrochemical selective dechlorination
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The invention discloses a method for preparing 4-amino-3,6-dichloropicolinic acid by electrochemical selective dechlorination. The method comprises the following steps: a diaphragm electrolytic tank is adopted, a 4-amino-3,5,6-trichloropyridine formate aqueous solution prepared from electronic-grade ultrapure water is used as a catholyte, an alkali metal hydroxide aqueous solution preparedfrom electronic-grade ultrapure water is used as an anolyte, a nickel-based material is used as an anode, and silver with purity of 99.95%-99.99% is used as a cathode; and an electrolysis reaction is carriedout under the conditions of a current density of 1-20 A/dm and a reaction temperature of 0-90 DEG C, after the electrolysis reaction is completed, the catholyte is separated and purified to obtainthe 4-amino-3,6-dichloropicolinic acid. According to the method provided by the invention, the catholyte and the anolyte are prepared by adopting the electronic-grade ultrapure water, the 4-amino-3,6-dichloropicolinic acid can be prepared through highly-selective dechlorination, the product yield is improved by 4-10%, and the purity is improved by 2-5%.
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Paragraph 0031-0034; 0038-0043; 0047-0052
(2021/04/07)
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- NOXIOUS ARTHROPOD CONTROL AGENT CONTAINING AMIDE COMPOUND
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An object of the present invention is to provide a compound having the controlling activity on a noxious arthropod, and a noxious arthropod controlling agent containing an amide compound of formula (I): wherein X represents a nitrogen atom or a CH group, p represents 0 or 1, A represents a tetrahydrofuranyl group or the like, R1, R2, R3, R4, R5, R6 and R7 represent a hydrogen atom or the like, n represents 1 or 2, Y represents an oxygen atom or the like, m represents any integer of 0 to 7, and Q represents a C1-8 chain hydrocarbon group optionally having a phenyl group or the like, has the excellent noxious arthropod controlling effect.
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- Method for preparing 4-amino-3,6-dichloropicolinic acid by reducing 4-amino-3,5,6-trichloropicolinic acid
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The invention discloses a method for preparing 4-amino-3,6-dichloropicolinic acid by reducing 4-amino-3,5,6-trichloropicolinic acid, which belongs to the technical field of chemical products. Under the conditions of a specific temperature, specific pressure and a specific PH value, chlorine on a pyridine ring is removed by virtue of catalytic hydrogenation to prepare 4-amino-3,6-dichloropicolinic acid. In the method, a clean and environment-friendly catalytic hydrogenation process is used for high selectively hydrogenating and reducing the 4-amino-3,5,6-trichloropicolinic acid to prepare the 4-amino-3,6-dichloropicolinic acid, and poisonous hazardous articles such as the reducing agent hydrazine and dichloromethane are not used in the production process, so that the method is moderate in reaction condition, simple in devices, convenient to operate, capable of realizing zero emission from the production of 4-amino-3,6-dichloropicolinic acid, suitable for industrialized mass production and remarkable in economical advantage and environmental protection advantage.
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Paragraph 0024-0027
(2017/03/08)
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- IMPROVED ELECTROCHEMICAL REDUCTION OF HALOGENATED 4-AMINOPICOLINIC ACIDS
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The selective electrochemical reduction of halogenated 4- aminopicolinic acids is improved by activating the cathode in the presence of the starting material, excess alkali metal hydroxide and an alkali metal chloride, bromide or sulfate.
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Page/Page column 9-10
(2008/06/13)
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