preparation | fluoroethylene carbonate was added to the reaction flask in a nitrogen atmosphere, then the first organic solvent was added, and then the chlorination reagent was added, the chlorine substitution reaction is carried out, and after the reaction is finished, the first organic solvent is distilled off to obtain crude 4-fluoro-5-chloroethylene carbonate as an intermediate; the intermediate and the fluorinated reagent are subjected to a fluorine displacement reaction in a second organic solvent, and after the reaction is completed, filtration is performed, and the filtrate is subjected to distillation under reduced pressure to obtain a semi-finished product of 4, 5-difluoroethylene carbonate; the semi-finished product was recrystallized to obtain a finished ethylene carbonate substitute. |