[C:1]([OH:12])(=[O:11])[C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=O)=[CH:4][CH:3]=1.[CH3:13]C1C=CN=CC=1.[C:20](Cl)(Cl)=[O:21].CC1C=CC=CN=1.C(Cl)(=O)C1C=CC(C(Cl)=O)=CC=1>ClCCl>[C:6]([O:21][CH3:20])(=[O:8])[C:5]1[CH:4]=[CH:3][C:2]([C:1]([O:12][CH3:13])=[O:11])=[CH:10][CH:9]=1Following the general procedure of Example 1 for the preparation of the diacid chloride, 9.06 parts of terephthalic acid were added to a mixture of 11.82 parts of 4-methylpyridine and 14.1 parts phosgene in 200 parts dry dichloromethane at 25° to 30° C. The ratio of equivalents of methylpyridine base/COOH acid group was 1.16. After carrying out the reaction and esterifying the resulting diacid chloride by the procedure described in Example 1, a 100% yield of dimethyl terephthalate was obtained corresponding to a quantitive yield of terephthaloyl chloride formed initially in the reaction.
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