The present invention aims at providing a convenient method of producing zinc pyrrolidonecarboxylate dihydrate, which is an industrially useful compound, with high optical purity, a higher yield, and better dissolution property. The present invention also provides a convenient method of producing zinc pyrrolidonecarboxylate dihydrate with higher optical purity, a higher yield, and better solution property by adding a zinc salt to an aqueous medium containing a salt of pyrrolidonecarboxylic acid as a starting material and separating a crystal from the aqueous medium at a specific pH.
本发明旨在提供一种方便的方法,用于高光学纯度、高产率和更好的溶解性生产工业上有用的二
水合
吡咯烷
酮羧酸锌化合物。本发明还提供了一种方便的方法,通过向含
吡咯烷
酮羧酸盐为起始材料的
水介质中添加
锌盐,并在特定pH下从
水介质中分离晶体,以生产高光学纯度、高产率和更好的溶解性的二
水合
吡咯烷
酮羧酸锌化合物。