Ionic liquid refers to a substance that is liquid at or near room temperature and consists only of ions. Many types of ionic liquids, ionic liquid precursor of different organic cation, can be divided into ionic liquid imidazole salts, pyridine salts, quaternary ammonium salts and quaternary phosphonium salts and the like; According to the solubility of ionic liquids in water, ionic liquids can also be divided into hydrophilic ionic liquids and hydrophobic ionic liquids. Among many ionic liquids, the proportion of ionic liquids with piperidine as the main functional group is relatively small. It can be modified by introducing R groups with different chemical structures to obtain functionalized ionic liquids. Functionalized ionic liquids can be widely used in fine organic synthesis, catalysis, electrochemistry, materials science, energy and other fields. Piperidine functionalized ionic liquids can be used in surfactants, catalyzing organic reactions and other fields.
Figure 1. Common composition of piperidinium-based ionic liquids
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