The present invention relates to a process for preparing bromoisophthalic acid compounds, particularly 5-bromoisophthalic acid compounds and 4,5-dibromoisophthalic acid compounds comprising brominating an isophthalic acid compound of the general formula (1)
1
wherein R
1
and R
2
independently of one another are hydrogen atom or C
1-6
alkyl, with bromine in a solvent containing sulfur trioxide. The object of the invention is to provide a process for preparing bromoisophthalic acid compounds, particularly 5-bromoisophthalic acid compounds and 4,5-dibromoisophthalic acid compounds in a highly selective manner by using bromine that is industrially inexpensive.
本发明涉及一种制备
溴异苯二
甲酸化合物,特别是5-
溴异苯二
甲酸化合物和4,5-双
溴异苯二
甲酸化合物的方法,包括在含有
三氧化硫的溶剂中用
溴对一般式(1)中R1和R2独立地为氢原子或C1-6烷基的异苯二
甲酸化合物进行
溴化。本发明的目的是提供一种使用工业上廉价的
溴高度选择性地制备
溴异苯二
甲酸化合物,特别是5-
溴异苯二
甲酸化合物和4,5-双
溴异苯二
甲酸化合物的方法。