申请人:Nissan Chemical Industries, Ltd.
公开号:EP1293495A1
公开(公告)日:2003-03-19
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)
wherein R1 and R2 independently of one another are hydrogen atom or C1-6 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间苯二甲酸化合物,特别是 5-溴间苯二甲酸化合物和 4,5-二溴间苯二甲酸化合物的工艺,该工艺包括在含有三氧化硫的溶剂中用溴溴化通式(1)的间苯二甲酸化合物,其中 R1 和 R2 各自为氢原子或 C1-6 烷基。
其中 R1 和 R2 各自为氢原子或 C1-6 烷基,在含三氧化硫的溶剂中用溴溴化。本发明的目的是提供一种利用工业上廉价的溴,以高选择性的方式制备溴间苯二甲酸化合物,特别是 5-溴间苯二甲酸化合物和 4,5-二溴间苯二甲酸化合物的工艺。