Disclosed herein is a method 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 95 weight
percent phenolphthalein, based on the total weight of phenolphthalein
material; quenching the reaction mixture and treating the quenched
reaction mixture to obtain a first solid. The first solid is then
triturated with a trituration solvent and washed to obtain a second
solid, wherein the second solid comprises greater than or equal to 97
weight percent 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, based
on the total weight of the second solid. The second solid may be
polymerized to form a polycarbonate.