公开(公告)号：US20200024232A1

公开(公告)日：2020-01-23

申请号：US16415482

申请日：2019-05-17

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Deshmukh Sandesh Shivajirao ,  Shivakumar Konda ,  Sivakumar Sreeremagiri ,  Sivakumar Periyasamy ,  Ravi Gautam ,  Srinivasan Namala ,  Ganesan Balakrishnan

IPC: C07D209/46 ,  C08G64/12 ,  C08G64/30

Abstract: A method for the purification of a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine of formula (I), the method comprising heating a reaction mixture comprising a phenolphthalein compound of formula (II) and a primary arylamine of formula (III) in the presence of an acid catalyst to form a reaction mixture; removing water from the reaction mixture; quenching the reaction mixture with an aqueous alkali solution to form a quenched reaction mixture; extracting the quenched reaction mixture with an aminoaryl compound of formula (IV) to form an organic layer and an extracted aqueous layer comprising a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound; contacting the extracted aqueous layer with carbon to form a semi-purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound; and mixing the semi-purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound with a solution comprising an alcohol and an acid to form a purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine of formula (I); wherein formulas (I), (II), (III), and (IV) are as provided herein.