Synergetic Effect And Application Of The Cation And Anion Of Functional Ionic Liquids

As a new type of cleaning media and green materials,ionic liquids are powerful in many fields such as extraction and separation,catalytic synthesis,and material preparation because of their excellent dissolving power,high stability,convenient designability,and recycling performance.Application prospects.Functionalized ionic liquids are ionic liquids in which an anion or cation is linked to a functional group via a covalent bond to exhibit a specific function.Due to the wide variety of ionic liquids,they can be functionally designed for specific purposes,making functional ionic liquids show great potential for application in many areas.This dissertation studies the design and synthesis of functionalized ionic liquids and their application in organic catalysis,material preparation and other fields,and discusses the structure and coordination effects of ionic liquids on their function.The main research contents and results are as follows:1.A series of alkyl-functionalized alcohol amine ionic liquids with different lengths of N,N-dimethylethanolamine?DMEA?and haloalkanes were synthesized.They were investigated for the cycloaddition reaction between alkylene oxide and carbon dioxide.effect.Studies have shown that the length of the alkyl chain has a great influence on the catalytic effect of ionic liquids.The n-octyl functionalized C₈DMEABr ionic liquid has the highest catalytic activity and further optimizes the optimal catalytic conditions.The reaction conditions of the catalytic system are mild,organic solvents are not needed,the substrate has good applicability,and the catalyst has good recycling ability.2.A series of ionic liquids with different anions and cations were obtained by combination of anions and cations.In the aqueous solution system,cuprous oxide was reduced by hydrating hydrazine in situ to prepare cuprous oxide,and the catalytic efficiency for click reaction was screened to find benzoic acid beet.The cuprous oxide synthesized with alkali as an additive has the best catalytic effect.The method for preparing cuprous oxide is simple and has good storage performance.The click catalyst system has a low amount of catalyst,mild reaction conditions,no need to add alkali and organic solvents,and is environmentally friendly.3.A series of alcohol amine ionic liquids with different side chains were synthesized by using N,N-dimethylethanolamine?DMEA?and haloalkane as raw materials to investigate the effect of nucleophilic fluorination in ionic liquid/water catalytic system.The results showed that the C8DMEABr ionic liquid has the best catalytic effect when used as a catalyst and solvent.The catalytic system has many advantages:the system is relatively simple,the catalyst is easy to prepare,no organic solvent is added,the reaction speed is fast,and the catalyst can be recycled.4.A series of alkynyl-functionalized ionic liquids were synthesized and their click reaction kinetics properties were investigated.By comparing with the general alkyne small molecules,it was found that the alkynyl ionic liquids have a faster click reaction rate,and their terminal hydrogens possessed Higher activity,where the brominated imidazolyl ionic liquid has the highest click reactivity.This ionic liquid was used as a raw material to prepare water-soluble ligand for efficient click reaction.