A process for preparing 3,4-disubstituted phenylacetic acids of the formula (I) in which X is fluorine, chlorine, bromine or iodine and R is C
1
-C
4
-alkylthio, C
1
-C
4
-alkylsulfonyl or C
1
-C
4
-alkylsulfoxide, starting from a 2-halo-C
1
-C
4
-alkylthiobenzene of the formula (II) in which X is as defined above and R1 is C
1
-C
4
-alkylthio.
一种制备式(I)的3,4-二取代
苯乙酸的方法,其中X为
氟、
氯、
溴或
碘,R为C1-C4-烷基
硫醇,C1-C4-烷基磺酰基或C1-C4-烷基亚磺酰基,从式(II)的2-卤代C1-C4-烷基
硫代苯中开始,其中X如上定义,R1为C1-C4-烷基
硫醇。