Synthesis Of Heteropolyacids Acidic Ionic Liquids And Their Applications In Organic Reactions

The ionic liquid has experienced decades of stage-evolution, currently it is developing forward direction of "task-specific". Achieved by the access of certain groups, functional ionic liquid gets its catalytic performance or co-catalytic properties. The load of Ionic liquid of the main way to get the catalytic properties is applicable to the homogeneous reaction, just combines the reaction solvent and the catalyst, which simplifies the reaction and the post-treatment process. And co-catalytic is more applicable to heterogeneous reaction, the significant catalytic activity of co-catalyst is generated from the effect of the ionic liquid and dissolve in transition metal catalyst. We can optimize the ionic liquid by adjusting the type and struction of the anoin and cation.However, the theoretical system of functionalized ionic liquid is not yet ripe, which still exits significant blindness. The task-specific ionic liquid needs auxiliary experimental to tentative lead to greatly reduce the efficiency of research and development of functional ionic liquid.The paper synthesized10heteropoly ionic lliquids,[PEG200-DSPIL][H2PW12O40]2,[PEG400-DSPIL][H2PW12O40]2,[PEG600-DSPIL][H2PW12O40]2,[PEG800-DSPIL][H2PW12O40]2,[PEG1000-DSPIL][HPW12O40],[PEG200-DSPIL][H2PMo12O40]2,[PEG400-DSPIL][H2P Mo12O40]2,[PEG6oo-DSPIL][H2PMo12040]2,[PEG800-DSPIL][H2PMo12040]2,[PEG1000-DS PIL][HPMo12O40]. Then, compared two synthesis methods of target ionic liquid and characterized the portion heteropoly ionic liquid and their intermediates by1H-NMR, IR, MS.Heteropoly acid ionic liquid series were used in the synthesis of multi-substituted imidazole compounds and coumarin derivatives, which [PEG400-DSPIL][H2PMo12O40]2performs the best. In the synthesis of multi-substituted imidazole compounds, When the dosage of catalyst [PEG400-DSPIL][H2PMo12O40]2reaches20mol%, with methanol as the solvent,70℃as reaction temperature,1:1:2as n (resorcinol):n (benzaldehyde):n (ammoniu macetate), the reaction yield up to79to94%after7h.[PEG400-DSPIL][H2P Mo12O40]2can also maintain a high catalytic activity after5times. In the synthesis of coumarin derivatives, When the dosage of catalyst [PEG4oo-DSPIL][H2PMo12O40]2reaches10～15mol%, with110℃as reaction temperature,1:1as n (resorcinol):n (acetyl ethyl acetate), the solvent-free reaction yield of53to95%after25min.In short, the paper synthesized10types of the heteropoly sour ionic liquid, the viscosity of Heteropoly acid ionic liquid is decreased as the temperature increased. Catalyst and raw materials mix for a phase and then change back to two-phase after the reaction. This property simplifies the processing and recycling of the catalyst, the heteropolyacids ionic liquid as the green catalyst has application value.