Method for the preparation of alpha, alpha, alpha', alpha' -tetrachloro-p-xylene with high purity
申请人:Jong Shean-Jeng
公开号:US20050143608A1
公开(公告)日:2005-06-30
A method of synthesizing a high purity product of α, α, α′, α′-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl
2
and dimethylformamide (DMF) to obtain a product mixture containing α, α, α′, α′-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl
2
and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of α, α, α′, α′-tetrachloro-p-xylene with a purity of 90-99 mol %.
合成高纯度的α, α, α′, α′-四氯-p-二甲苯的方法已被披露。该方法包括进行第一阶段反应,将苯二甲醛与硫代氯化物(SOCl2)和二甲基甲酰胺(DMF)的混合物反应,以获得含有α, α, α′, α′-四氯-p-二甲苯为主要产物和4-二氯甲基苯甲醛为副产物的产物混合物;向第一阶段反应的产物混合物中加入SOCl2和DMF进行第二阶段反应;将第二阶段反应的产物混合物加入冷水中,以获得纯度为90-99摩尔%的α, α, α′, α′-四氯-p-二甲苯固体产物。