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A novel poly(ethylene glycol) bridged tertiary amine functionalized ionic liquid PEG800-DPIL(Cl) was synthesized. It can form a temperature driven reversible biphasic system with cyclohexane/isopropanol mixed solvent. This biphasic system was applied in Knoevenagel condensation up to 99%. PEG800-DPIL(Cl) could be simply recovered and recycled for several runs.
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Luo et al. (2012) studied this question.
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