微波法合成离子液体中间体1-烷基-2,3-二甲基咪唑类溴盐  

Microwave assisted synthesis of ionic liquid intermediate 1-n-alkyl-2,3-dimethylimidazolium bromides

作　　者：章靖[1] 祝艳琳[1] 李万博[1] 田丹碧[1] 

机构地区：[1]南京工业大学理学院,江苏南京210009

出　　处：《化学试剂》2008年第9期654-656,共3页Chemical Reagents

基　　金：江苏省高校自然科学基础研究项目(07KJB430041)

摘　　要：以1,2-二甲基咪唑和溴代烷烃为原料,采用微波法合成了标题化合物。与传统方法相比,反应时间大大缩短。产物结构经IR和1HNMR确证,并得出结论：阳离子烷基链长度的增加会使3100~3000 cm-1波数范围内谱带减弱,降低离子液体的熔点,而对咪唑环上质子化学位移影响不大。Five ionic liquid intermediates 1-n-alkyl-2, 3- dimethylimidazolium bromides （CndmimBr, n = 2 ~ 6） were syn- thesized from 1,2-dimethylimidazolium and alkyl bromides under microwave irradiation. The ionic liquids investigated hereupon were l-ethyl-2,3-dimethylimidazolium bromide, I- n-propyl-2,3- dimethylimidazolium bromide, 1- n-butyl-2,3-dimethylimidazolium bromide, 1- n-amyl-2,3-dimethylimidazolium bromide, and 1- n- hexyl-2,3-dimethylimidazolium bromide, respectively. The reac- tion time was drastically reduced as compared to conventional methods. Their structures were characterized by IR and 1HNMR. It was concluded that the increase in alkyl chain length of cation would weaken the band in the range of 3 100 ~ 3 000 cm- 1 and decrease the melting point of ionic liquids, but could have a weaker effect on proton chemical shifts of imidazolium ring.

关 键 词：离子液体 中间体 微波 合成 

分 类 号：O626.23[理学—有机化学] TQ252.3[理学—化学]