preparation | 100g of industrial aminoacetic acid, 400ml of n-octanol and 11g of catalyst p-toluenesulfonic acid are added to a three-mouth flask, connected to a water separator, condenser tube and stirrer, heated and heated in gradient, and gallic acid is completely dissolved at a certain temperature, the reaction is carried out at a temperature of 105 ℃ until the end of the reaction is reached when no water is generated (the reaction time is 4 hours). Then the reactants are neutralized, washed, crystallized at low temperature, and vacuum filtered to obtain a white needle-like crystalline crude n-octyl aminoacetate; the crude n-octyl aminoacetate is refined, recrystallized, and vacuum After drying, 81.2g of n-octyl aminoacetate is obtained with a content of 99.3%, and then n-octyl aminoacetate hydrochloride is obtained by adding hydrochloric acid. |