Method for synthesizing oxime ether

The invention discloses a method for synthesizing oxime ether. The method includes the steps of: adding 1 mol portion of ketoxime in 1- butyl-3- methylimidazole tetrafluoroborate of which the adding amount is 2-20 times of the weight of the ketoxime; then adding 1.05-2.6 mol portions of alkali, dripping 1-1.3 mol portions of alkylating agent at the temperature of 0-50 DEG C within 0.5-2h; after dripping, reacting for 0.5-2h with the temperature preserved; then filtering, adding ether which is 5-20 times of the weight of the 1-butyl-3- methylimidazole tetrafluoroborate in the filtrate and extracting respectively for 4-8 times; combining the upper layer of extraction liquid, recovering ether solvent through distillation and finally conducting rectification separation to obtain the product. The method adopts ion liquid as reaction solvent, which is not volatile, does not generate harmful gas and wastewater, and improves the operation environment. The process is simple, the post treatmentinvestment is low, and th