METHOD FOR ISOLATING SALT OF PYRUVIC ACID DERIVATIVE

摘要

PROBLEM TO BE SOLVED: To provide a method for readily and inexpensively isolating a salt of a pyruvic acid derivative difficult to be taken out and dissolved in a solution, in good purity in a short time at a low cost. SOLUTION: Another salt or an acid, not reacting with a compound represented by general formula [I] and having higher solubility in water is added to a solution including the salt of the pyruvic acid derivative (e.g. sodium 2-naphthylpyruvate) represented by general formula [1] to precipitate and recover the compound represented by the general formula [I].