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  • After extracting the excess phenol with water, alcohol or aromatics, such as benzene or toluene, the isatin-bisphenols can be purified by dissolving them in alkalis such as dilute sodium hydroxide solution or ammonia solution and subsequently precipitating them in acids, or by recrystallization from common solvents such as alcohol, glacial acetic acid, ethyl acetate or benzene.
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