Filtration, atmospheric distillation of the filtrate to recover acetone, after most of the acetone is evaporated, a small amount of n-hexane is added, cooling and suction filtration, the product is washed with a small amount of 4:7 (volume ratio) acetone n-hexane, and the white product IAA11.6 g is dried, the yield is 94.3%, and the melting point is 217-219
Cell 175 , 17801795.e19 (2018)
INTRODUCTION The introduction of cocaine as the first local anesthetic (LA) in the late nineteenth century was soon accompanied by reports of its systemic toxicity

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