摘要
用FT-IR和1HNMR分析KOH无水乙醇溶液滴定前后的盐酸三乙胺无水乙醇溶液,发现(C2H5)3NHCl中的H具有显著的质子酸性,且在滴定过程中有KCl生成,滴定后的1HNMR谱中δ7.3处的谱峰完全消失.将合成的(C2H5)3NHCl/AlCl3离子液体脱水,在超临界条件下催化全氘代苯与丙烯的烷基化.用同位素取代法,研究了反应机理.结果表明,脱水后的离子液体仍然可以催化烷基化反应,液体产物的GC-MS分析结果支持正碳离子机理.对比反应前后离子液体的1HNMR谱图发现,反应后离子液体中盐酸三乙胺中与N相连H的谱峰强度较反应前降低了80.12%,可能是引发反应消耗了这部分H.
It was proved that the H in （C2H5）3NHCl was proton acidic through the FT-IR and ^1H NMR analysis of （C2H5）3NHCl solution titrated with KOH alcohol solution, during which KCl was formed and after which the signal of H at δ 7.3 in the ^1H NMR spectrum disappeared completely. When the dewatered （C2H5）3NHCl/AlCl3 ionic liquid was used as a catalyst, the alkylation catalytic mechanism under a super critical conditions was studied using an isotope exchange method in this paper. The results showed that the dewatered ionic liquid could still catalyze the alkylation, and the carbonium mechanism was established through the GC-MS analysis of the reaction liquid product. It was found that the strength of H linked to N was reduced by 80.12% comparing the ^1H NMR spectrum before and after the reaction, so the H^＋ initiating the reaction was the H linked to N in the （C2H5）3NHCl.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2008年第4期471-475,共5页
Acta Chimica Sinica
基金
国家自然科学基金(No.20676150)
中国石油天然气股份有限公司科技风险创新基金(油科函字[2005]68号)
北京市自然科学基金(No.2052010)资助项目
关键词
离子液体
烷基化反应
超临界
催化机理
ionic liquid
alkylation
super critical
catalytic mechanism
