A hydroquinone diester derivative represented by the formula (1):
wherein R1 and R2 are the same or different, each representing an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group
is crystallized from a reaction mixture containing the hydroquinone diester derivative, and the resulting product in crystallized form is washed. A solvent for the crystallization is composed of an organic carboxylic acid and water, and the crystallized product is washed with warm or hot water of 40° C. or above. In the formula (1), R1 and R2 are C1-4alkyl groups.
一个由
化学式(1)表示的羟基
喹啉二酯衍
生物,其中R1和R2相同或不同,分别代表烷基基团、环烷基基团、芳基或杂环基团,从含有羟基
喹啉二酯衍
生物的反应混合物中结晶出来,所得的结晶形式的产物被洗净。用于结晶的溶剂由有机
羧酸和
水组成,结晶产物用40°C或以上的温暖或热
水洗涤。在
化学式(1)中,R1和R2是C1-4烷基基团。