New hydrogen carbonate precursors for efficient and byproduct-free syntheses of ionic liquids based on 1,2,3-trimethylimidazolium and N,N-dimethylpyrrolidinium cores
作者:Marcin Smiglak、C. Corey Hines、Robin D. Rogers
DOI:10.1039/b920003g
日期:——
formation of the hydrogen carbonate salts involved simple alkylation reactions of the chosen neutral amines with dimethyl carbonate, and later conversion of the formed methyl carbonate anion-based salts to hydrogen carbonate salts. The reactions proceed in one step at temperatures close to room temperature using only water. The new organic salts with the chosen anions are formed with only gaseous byproducts
两种新的碳酸氢盐IL前体, 1,2,3-三甲基咪唑鎓和Ñ,Ñ -dimethylpyrrolidinium碳酸氢盐,合成了它们的结构确认由核磁共振 和 单晶X射线衍射。还通过使这些盐与各种酸和[NH 4 ] [ClO 4 ]反应,评估了这些盐在合成IL中的应用,从而形成了清洁,定量的一族1,2,3-三甲基咪唑鎓-和N,N-二甲基吡咯烷鎓盐。形成碳酸氢盐的合成方案涉及简单烷基化所选择的中性胺与碳酸二甲酯的反应,然后将形成的碳酸甲酯阴离子基盐转化为碳酸氢盐。反应仅在接近室温的温度下一步进行水。新的有机盐带有选定阴离子的阴离子仅与气态副产物(CO 2,H 2 O,在[NH 4 ] [ClO 4 ] NH 3的情况下)形成,从而进一步消除了纯化脚步。这种用于形成碳酸氢盐IL前体的通用合成规程可以用作清洁,无污染的通往许多类IL的途径。