A process for producing a 5-fluorobenzoic acid of the formula (V), which comprises trichloromethylating a fluorobenzene of the formula (I) to obtain a 5-fluorobenzotrichloride of the formula (II), then reacting it with aqueous ammonia to obtain a 5-fluorobenzonitrile of the formula (III), reacting it with a fluorinating agent to obtain a 5-fluorobenzonitrile of the formula (IV) and hydrolyzing it: ##STR1## wherein each of X.sub.1, X.sub.3, Y.sub.1 and Y.sub.3 is a halogen atom, and each of X.sub.2 and Y.sub.2 is hydrogen or a halogen atom.
一种制备5-
氟苯甲酸(V)的方法,包括将式(I)的
氟代苯三
氯甲基化以获得式(II)的5-
氟苯甲酰三
氯化物,然后与
水溶
氨反应以获得式(III)的5-
氟苯甲腈,再与
氟化剂反应以获得式(IV)的5-
氟苯甲腈,并加
水解反应:##STR1## 其中X.sub.1、X.sub.3、Y.sub.1和Y.sub.3均为卤素原子,X.sub.2和Y.sub.2均为氢或卤素原子。