N,N-Dimethylaniline → Terephthaloyl chloride

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Following the general procedure in Example 1 for the preparation of the diacid chloride, 8.93 parts of terephthalic acid were added to a mixture of 16.47 parts of N,N-dimethyl aniline and 12.8 parts phosgene in 200 parts dry dichloromethane at 25° to 30° C. The ratio of equivalents of dimethylaniline base/COOH acid group was 1.26. After carrying out the reaction and esterifying the resulting diacid chloride by the procedure described in Example 1, 9.87 parts of a solid containing 95.4% dimethyl terephthalate was obtained corresponding to a 90.2% yield of theory of terephthaloyl chloride formed initially in the reaction.

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