Process for producing aryl boronic acid alkylenediol ester crystals

摘要

PROBLEM TO BE SOLVED: To provide an economical and industrially advantageous method for obtaining an arylboronic acid alkylene diol ester of high purity, especially one having a remarkably low halogen content.SOLUTION: Provided is a method for producing a C5-25 arylboronic acid alkylene diol ester crystals, comprising: step A of producing a C5-25 aryl boronic acid alkylene diol ester by reacting a C3-20 arylboronic acid and a C2-5 alkylene diol in organic solvent; and step B of precipitating the C5-25 arylboronic acid alkylene diol ester obtained in step A in the reaction solution of the above step.