A method for obtaining a 5-bromolevulinic acid methyl ester or a 5-chlorolevulinic acid methyl ester from either a bromination mixture or a chlorination mixture, containing either a 5-bromo-levulinic acid methyl ester or a 5-chlorolevulinic acid methyl ester, respectively, produced by either brominating or chlorinating levulinic acid or a levulinic acid methyl ester, and further including the steps of dissolving the bromination or chlorination mixture in an organic solvent or solvent mixture and cooling the solution, preferably to −20° C.-−40° C., with the 5-bromolevulinic acid methyl ester or 5-chlorolaevulinic acid methyl ester being crystallized out of the solution. The 5-bromolevulinic acid methyl ester or 5-chlorolevulinic acid is then isolated by draining off the solution with the remaining bromination mixture or chlorination mixture, as appropriate.
从
溴化混合物或
氯化混合物中获取5-
溴丙酮酸甲酯或5-
氯丙酮酸甲酯的方法,分别包含5-
溴丙酮酸甲酯或5-
氯丙酮酸甲酯,这些物质是通过
溴化或
氯化
丙酮酸或
丙酮酸甲酯产生的。进一步包括将
溴化或
氯化混合物溶解在有机溶剂或溶剂混合物中,并冷却溶液,最好冷却至-20°C至-40°C,其中5-
溴丙酮酸甲酯或5-
氯丙酮酸甲酯从溶液中结晶出来。然后通过排出剩余的
溴化混合物或
氯化混合物,分离出5-
溴丙酮酸甲酯或5-
氯丙酮酸甲酯。