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A quantitative solvent DMF is added to the reactor and a certain amount of <strong>[94050-90-5]R-(+)-2-(4-hydroxyphenoxy)propionic acid</strong> is added; oftenAfter stirring for 0.5 hour, add a certain amount of sodium carbonate slowly. During the reaction, carbon dioxide gas is generated. After the end, it rises.Warm to 100-110C for 1 hour to obtain a mixture of Intermediate 1 to be reacted next step.Among them, the intermediate 1 is C9H8Na2O4, the product is C9H8Na2O4, carbon dioxide CO2 and water H2O; C9H8Na2O4,The mass ratio of carbon dioxide CO2 to water H2O is 226:44:18.Wherein, the mass ratio of said <strong>[94050-90-5]R-(+)-2-(4-hydroxyphenoxy)propionic acid</strong> C9H10O4 and sodium carbonate Na2CO3 is 182:106.The amount of 3,4-dichlorobenzonitrile was added dropwise to the previous reaction mixture.Dropping time is about 0.5 hours.After dropping, it is sampled and analyzed at 100-110C for 2 to 2.5 hours.Material content <0.3% qualified,Otherwise extend the holding time,Until qualified,Obtain the intermediate 2 mixture,Wait for the next reaction.Among them, the intermediate 2 is C16H11ClNNaO4, the product is C16H11ClNNaO4, sodium chloride NaCl;The mass ratio of C16H11ClNNaO4 and sodium chloride NaCl is 635:17.Wherein, the mass ratio of the intermediate 1C9H8Na2O4, 3,4-dichlorobenzonitrile C7H3Cl2N is 226:172.Intermediate 2 mixture was cooled to room temperature,To which a quantitative amount of hydrochloric acid was added dropwise,Neutralize the reaction solution to weakly acidic,The intermediate 3 mixture was obtained until the next step.Among them, the intermediate 3 is C16H12ClNO4, the product is C16H12ClNO4, sodium chloride NaCl, C16H12ClNO4, chlorine The mass ratio of sodium NaCl was 678:17.Wherein, the mass ratio of the intermediate 2C16H11ClNNaO4 and hydrochloric acid HCl was 679:73. |