A process is disclosed for preparing N-(1,1-dimethyl-3-oxobutyl)acrylamide which comprises (1) contacting a dispersion of 5,6-dihydro-6-hydroxy-4,4,6-trimethyl-2-vinyl-1,3,3(4H)-oxazine-3-ium sulfate (1:1) in a water-immiscible organic solvent with a neutralizing or alkalizing amount of gaseous ammonia at a temperature between about 10.degree. C. and 25.degree. C. to form a solution of diacetone acrylamide in said organic solvent and a precipitate of crystalline ammonium sulfate; (2) separating the crystals of ammonium sulfate; (3) cooling the organic mother liquors recovered from step (2) to about -10.degree. C. to 20.degree. C. to crystallize N-(1,1-dimethyl-3-oxobutyl)acrylamide therefrom; and (4) recovering the crystals of N-(1,1-dimethyl-3-oxabutyl) acrylamide, washing the recovered crystals with a cold water-immiscible organic solvent and drying the same.
揭示了一种制备N-(
1,1-二甲基-3-
氧代丁基)
丙烯酰胺的方法,包括(1)将5,6-二
氢-6-羟基-4,4,6-三
甲基-2-
乙烯基-1,3,3(4H)-
噁唑-3-ium
硫酸盐(1:1)的分散体与一定量的
氨气在温度在10℃至25℃之间的不溶于
水的有机溶剂中接触,形成二
丙酮丙烯酰胺在有机溶剂中的溶液和结晶的
硫酸铵沉淀物;(2)分离
硫酸铵晶体;(3)冷却从步骤(2)中回收的有机母液至约-10℃至20℃,从中结晶出N-(
1,1-二甲基-3-
氧代丁基)
丙烯酰胺;(4)回收N-(
1,1-二甲基-3-
氧代丁基)
丙烯酰胺晶体,用冷的不溶于
水的有机溶剂洗涤回收的晶体并干燥。