1,2-Dichloroethane → Terephthaloyl chloride

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Following the general procedure of Example 1 for the preparation of the diacid chloride, 10.31 parts of terephthalic acid were added to a mixture of 10.57 parts pyridine and 14.5 parts phosgene in 200 parts dry 1,2-dichloroethane at 25° to 30° C. The ratio of equivalents of pyridine base/COOH acid group was 1.08. After carrying out the reaction and esterifying the resulting diacid chloride by the procedure described in Example 1, a 95% yield of theory of dimethyl terephthalate was obtained corresponding to a 95% yield of theory of terephthaloyl chloride formed initially in the reaction.

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