Newly designed flow reactor as an original method of synthesis of ionic liquids by ion-exchange reactions
作者:Anna Pawlowska-Zygarowicz
DOI:10.1016/j.tetlet.2021.153500
日期:2021.12
the method of synthesizing ionic liquids (ILs) by ion exchange was optimized. The flow rate of the substrates and the selection of the packing of the column in which the reactions were carried out (random packing or a chemical compound in the form of a solid, which was the source of the anionexchanged) were also optimized. The purity of the obtained ionic liquids and the progress of the reaction was
Rational selection of the cation of an ionic liquid to control the reaction outcome of a substitution reaction
作者:Rebecca R. Hawker、Ronald S. Haines、Jason B. Harper
DOI:10.1039/c8cc00241j
日期:——
A range of ionic liquids was examined as solvents for a substitution reaction. They were chosen through rationally varying the ionic liquid cation in order to enhance the rate constant. Access to charge and electron-withdrawing substituents benefitted rate enhancement, allowing ionic liquids to be rationally selected to control reaction outcome.
Biodegradable pyridinium ionic liquids: design, synthesis and evaluation
作者:Jitendra R. Harjani、Robert D. Singer、M. Teresa Garcia、Peter J. Scammells
DOI:10.1039/b811814k
日期:——
A range of ionic liquids (ILs) with a pyridinium cation were synthesised and their biodegradability was evaluated using the CO2 Headspace test (ISO 14593). ILs bearing an ester side chain moiety were prepared from either pyridine or nicotinic acid and showed high levels of biodegradation under aerobic conditions and can be classified as ‘readily biodegradable’. In contrast, pyridinium ILs with alkyl side chains showed significantly lower levels of biodegradability in the same test. The utility of the biodegradable IL 6c as a reaction solvent for the Diels–Alder reaction was also investigated.
only 0.2 wt %. The used halide anion from the synthesis route was the major anion impurity, yet with chloride also bromide and fluoride (potentially from hydrolysis of [BF4]–) were often detected. When iodide was used, at least chloride but sometimes also bromide and fluoride was present. However, even if the IL-anion content is above 99 wt %, it does not necessarily indicate an ionic liquid devoid of
使用离子色谱法同时测定卤化物杂质(氟化物、氯化物、溴化物和碘化物)和离子液体 (IL) 阴离子(四氟硼酸盐、六氟磷酸盐和三氟甲磺酸盐)是通过碱性非梯度离子色谱系统开发的。非梯度方法在 AS 22 色谱柱上使用水/乙腈 (70:30 v:v) 中的洗脱液 Na2CO3/NaHCO3,能够在可接受的运行时间(22 分钟)内快速、同时分析不同的离子液体和卤化物阴离子) 且分辨率 R 大于 2.4,容量 k' 介于 0.4 和 5.1 之间,选择性 α 介于 1.3 和 2.1 之间,峰不对称性 As 小于 1.5。可以量化低于 1 ppm(制备的样品溶液的 1 mg·L–1)的卤化物杂质。一系列离子液体,含四氟硼酸盐 [BF4]–、六氟磷酸盐 [PF6]–、和双(三氟甲基磺酰基)亚胺(三氟甲磺酰亚胺)[NTf2]– 阴离子与基于咪唑、吡啶和四氢噻吩的阳离子结合,可以分析其阴离子纯度。IL-阳离子