中文摘要：

利用红外光谱技术研究了无水乙酸锌催化2,4-二氨基甲苯与碳酸二甲酯反应生成2,4-甲苯二氨基甲酸甲酯的甲氧基羰基化反应机理。结果表明,碳酸二甲酯羰基碳上的氧与无水乙酸锌中的Zn2＋配位形成配合物,无水乙酸锌的结构由双齿型转变为单齿型,同时使DMC的羰基碳被活化。然后2,4-二氨基甲苯作为亲核试剂,其氨基进攻配合物中碳酸二甲酯上被活化的羰基碳原子,发生甲氧基羰基化反应,配合物中的Zn—O配位键断裂,生成2,4-甲苯二氨基甲酸甲酯和甲醇,并使无水乙酸锌的结构重新回到双齿型。

英文摘要：

The methoxycarbonylation mechanism of synthesizing 2,4-toluene dicarbarnate from 2,4-toluene diamine and dimethyl carbonate catalyzed by anhydrous zinc acetate was investigated by Fourier transform infrared spectroscopy. The result shows that the new coordination complex was formed by oxygen atom of dimethyl carbonate＇s carbonyl group attaching to zinc atom of anhydrous zinc acetate to form the Zn-O coordination bond, and the anhydrous zinc acetate changed from a bidentate ligand to a unidentate ligand. Simultaneously, dimethyl carbonate＇s carbonyl group was activated. 2,4-toluene diamine was a nucleophilic reagent, and it＇s amidos attacked the activated carbon of dimethyl carbonate＇s carbonyl group in the new coordination complex to produce the methoxycarbonylation compound 2,4-toluene dicarbamate, then the Zn-O coordination bond in the new coordination complex was broken. At the same time, the anhydrous zinc acetate returned to a bidentate ligand.