中文摘要：

以3，4-二甲基苯胺为原料，经与水合氯醛、盐酸羟胺缩合，浓HzS04作用下环合，碱性双氧水条件下进一步氧化开环合成2-氨基-4，5-基苯甲酸，三步反应的总收率为34．3％．产物结构经傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（。HNMR）表征，证明了结构的正确性．

英文摘要：

2-amino-4,5-dimethylbenzoic acid was synthesized from 3,4-dimethyl aniline by condensation with chloral hydrate and hydroxylamine hydrochloride, cyclization with concentrated H2SO4, and then oxidation in alkaline hydrogen peroxide solution, the overall yield was 34. 3%. The structure of the compound was characterized by Fourier transform infrared spectroscopy （FT-IR）, magnetic resonance spectroscopy （1 H NMR）.