Process for the preparation of di-ortho-substituted di-meta-halogenated para-halomethylphenols
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0243869A2
公开(公告)日:1987-11-04
The invention is a process to prepare a 4-(bromo or chloro)methyl-3,5-dihalo-2,6-disubstituted phenol from a 4-methyl-2,6-disubstituted phenol and a brominating or chlorinating agent, in an aprotic organic diluent. The process is highly selective and efficient. For example, high purity 4-bromomethyl-3,5-dibromo-2,6-dimethylphenol can be prepared from 2,4,6-trimethylphenol and bromine, in bromochloromethane at high conversion.
本发明是一种以 4-甲基-2,6-二取代苯酚和溴化剂或氯化剂为原料,在非沸腾有机稀释剂中制备 4-(溴或氯)甲基-3,5-二卤-2,6-二取代苯酚的工艺。该工艺选择性强,效率高。例如,在溴氯甲烷中,可从 2,4,6-三甲基苯酚和溴制备高纯度的 4-溴甲基-3,5-二溴-2,6-二甲基苯酚,且转化率高。