Chinese Journal of Organic Chemistry ›› 2020, Vol. 40 ›› Issue (12): 4322-4327.DOI: 10.6023/cjoc202005059 Previous Articles     Next Articles


沈晶茹, 李利红, 王晓刚, 张甲男, 江振林   

  1. 上海工程技术大学化学化工学院 上海 200335
  • 收稿日期:2020-05-22 修回日期:2020-07-23 发布日期:2020-08-19
  • 通讯作者: 李利红

Green Synthesis of 2,2'-Bibenzazole and Its Polymers by Using Hexachloroacetone as C2 Synthon

Shen Jingru, Li Lihong, Wang Xiaogang, Zhang Jia'nan, Jiang Zhenglin   

  1. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 200335
  • Received:2020-05-22 Revised:2020-07-23 Published:2020-08-19

A novel cyclization reaction by using hexachloroacetone as C2 synthon has been studied. The optimal condition was obtained by synthesis of bibenzothiazole in the presence hexachloroacetone in water. Experimental results showed that the nucleophilicity of substrates played a key role in the cyclization reaction, and catalytical amount of oxygen in reactions was also vital to trigger ring fusion in the formation of target compounds. Accordingly, the mechanism of cyclization reaction was proposed:the thiazole ring is formed in the first place by a nucleophillic attack of 2-aminobenzenethiol, followed by CCl3 cleavage from hexachloroacetone. Then the second 2-aminobenzenethiol launches another nucleophilic attack, and three chloride ions leave to form the second thiazole ring. The method was applied to the substrates of 2,5-diaminobenzene-1,4-dithiol and benzene-1,2,4,5-tetraamine, respectively and two polymers of polyphenylene dithiazole and polyphenylene diimidazole were successfully prepared. The experimental conditions were mild, the yield was high and the application value was high.

Key words: hexachloroacetone, bibenzothiazole, bibenzimidazole, polyphenylene dithiazole, polyphenylene diimidazole