Design And Catalytic Applications Of Polymeric Ionic Liquid Of Thermoregulated Biphasic In Organic Reactions

Due to the drawbacks of large loss and easy deactivation of catalyst in the traditional thermoregulated biphasic systems,polymeric ionic liquid of thermoregulated biphasic performance with toluene was synthesized with polyethylene glycol as the main chain and double bonds imidazole-based ionic liquid as crosslinking agent through the free radical polymerization.Meanwhile,polymeric ionic liquid-gold nanoparticles(PIL@-Au)catalystwas also prepared by cooperating with polymeric ionic liquids.The Specific contents were as follows:The thermoregulated biphasic performance of the developed PIL in aqueous and common organic solvents has been fully investigated,PIL has obvious characteristics of mono-phase under high temperature and bi-phase under room temperature with toluene.The CST(critical solution temperature)of PIL with toluene was 60?,which meet the required temperature of common reactions.The effects of the amount of PIL,the ratio of ingredients,the reaction time and the reaction temperature were investigated by single factor method in the reaction of amine aldehyde condensation of aniline with benzaldehyde catalyzed by acid in the thermoregulated biphasic performance system of PIL/toluene.The optimum reaction conditions were as follows:1 g of PIL,1:1.2(benzaldehyde:10 mmol,aniline:12 mmol)and 4 mL of toluene,and the reaction was carried out at 100? for 2 h.At this time,the yield of N-benzalaniline was the highest of 93.4%.Serious further tests of the substituent effect on the reaction were investigated with the yields of 57.2%-93.4%,which showed that the system had extensive applicability in the condensation reactions.The catalytic epoxidation of styrene with thermoregulated biphasic performance system of PIL@-Au/toluene was studied.The effects on the selectivity and the yield of catalyst dosage,reaction time,reaction temperature,initiator amount and solvent dosage on the epoxidation of styrene were investigated by single factor method.The optimum reaction conditions were as follows:PIL@-Au 80 mg,0.624 g styrene,reaction temperature 110?,5 mL toluene solution,8%TBHP initiator(molar ratio to styrene),O2 flow rate 25 mL · min-1.And the conversion of styrene was 97.8%and the selectivity of epoxystyrene was 81.9%.The separation and recycling of PIL and PIL@-Au in the temperature control system under the optimum reaction conditions were studied.The results showed that the catalysts had higher catalytic activity,better catalytic stability and lower loss rate.The application of polymeric ionic liquid acid catalysis and the application of polymeric ionic liquid synergic metal and metal compound catalyst in the development of polymeric ionic liquid and catalyst recycling are of great significance and application value.