884494-76-2Relevant articles and documents
6-chloro-3-fluoro-2-pyridine carboxylic acid synthesis
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, (2017/03/14)
The invention discloses a 6-chlorine-3-fluorine-2-picolinic acid synthesis process. The main starting material is 6-chlorine-3-fluorine-2-methylpyridine.The 6-chlorine-3-fluorine-2-methylpyridine serves as the starting material, dilute sulphuric acid is a solvent, potassium dichromate is an oxidizing agent, sodium tungstate (Na2WO4 2H2O) and crown ether are a composite catalyst, after reaction is completed, a crude product is obtained through conventional post-processing, the crude product is heated to be dissolved in an alkaline aqueous solution, unreacted micro raw materials and other impurities are extracted through an organic solvent, a water layer is acidized through mineral acid, pure 6-chlorine-3-fluorine-2-picolinic acid is obtained after cooling and crystallization are carried out, the yield is high, and the quality of the product is good.