Abstract: o-nitrophenylacetic acid was synthesized by C2H5ONa-catalyzed condensation of o-nitrotoluene with diethyl oxalate and subsequently by hydrolysis，oxidation with H2O2 and acidation with HCl. The yield was about 62％. It was further converted to o-halophenylacetic acid by FeO(OH)-catalyzed reduction with hydrazine hydrate in 20% NaOH aqueous solution，diazonation and substitution with haloatoms. The yield was 65％～73％. The overall yield was about 40％～45％.

摘要： 在乙醇钠催化下使邻硝基甲苯与草酸二乙酯缩合，然后经水解、双氧水氧化和盐酸酸化得到邻硝基苯乙酸，收率62％。在20% NaOH水溶液中，FeO(OH)催化水合肼还原邻硝基苯乙酸得到邻氨基苯乙酸，经重氮化和卤置换反应得到邻卤苯乙酸，收率65％～73％。总收率为40％～45％。