Potassium Hydroxide → 1,4-Benzenedicarboxylic acid, 2,5-bis[(4-chlorophenyl)amino]-

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8.9 Parts of 2,5-di(p-chloroanilino)-3,6-dihydroterephthalic acid dimethyl ester, 50 parts of ethanol, 5.37 parts of KOH, 24.35 parts of water and 6 parts of sodium m-nitrobenzenesulfonate were charged into a 200-ml flask of stainless steel, and refluxed with stirring for 10 hours. When the suspension changed to a black solution, ethanol was steam-distilled, and the reaction mixture was filtered to remove a solid. The remaining solution was heated up to 80° C. with stirring, and after 35 parts of a 10% hydrochloric acid aqueous solution was dropwise added, the mixture was maintained for 1 hour. Then, the mixture was filtered, washed with hot water and dried to give 8.21 parts (98.4% of the theoretical yield) of 2,5-di(p-chloroanilino)terephthalic acid.

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