Patent ID: 7592464
Filing Date: 2009-09-22
Classification: C07D,C08G

Abstract:
1. A method for producing 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine comprising: reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solution; filtering the first solution; adding base to the filtered first solution to obtain a second solution; treating the second solution two or more times with a solid adsorbent to obtain a third solution; acidifying the third solution to precipitate a second solid; isolating and washing the second solid; triturating the second solid in a triturating solvent to obtain a third solid, wherein the third solid comprises greater than or equal to 99.9 weight percent 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, based on the total weight of the third solid; and wherein the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine is of formula (I): wherein R