Extraction Synthesis,properties Of Rhenium Ionic Liquid And Application In Catalytic Epoxidation Of Olefin And Deoxydehydration Of 1,2-Octanediol

In recent years,rhenium and its compounds have been widely studied for their excellent performance in chemical catalysis,but they usually are involved in heterogeneous catalytic reaction.It needs harsh reaction conditions such as high temperature and high pressure,and it has a lower catalytic yield and selectivity.All these have seriously hampered its development in the field of catalysis.With the development of green chemistry,ionic liquids have gradually been used as catalysts and reaction solvents for chemical reactions due to its design ability,thermal stability and low volatility.Based on the previous research experience,a novel functional rhenium ionic liquid of triisocyanate ammonium perrhenate（[TiOA][ReO₄]）was successfully synthesized by extractive synthesis.And its structure was verified by characterization methods of ¹H-NMR,IR,Raman,TG and DSC.The density,surface tension and refractive index of the ionic liquids were measured in the temperature range of（293.15 to 343.15±0.1）K with an interval of 5 K.On the basis of these experimental data,the other volume properties and surface properties of the two series of ionic liquids were estimated by the semiempirical method.The deoxydehydration of polyols to alkenes is one of the important methods for the conversion of biomass-based platform molecules to useful chemicals.In this paper,[TiOA][ReO₄]is applied to the deoxygenation of 1,2-octanediol to 1-octene.It reduced the reaction time and temperature and increased the 1-octene yield,selectivity,and catalyst cycle times by the single-factor experiment.The optimum reaction conditions and the degree of influence of the catalytic system were determined by three-level three-factor response surface optimization experiments.Under optimal conditions,the yield of deoxy-dehydration of 1,2-octanediol was 95.53%and the selectivity was greater than 99%.Comprehensive analysis of the impact of various factors on the yield:catalyst dosage>solvent dosage>reaction time.Epoxy compounds are widely used organic intermediates due to their oxygen-containing triple structure and chemically active.It can convert functional groups through ring-opening reactions,which plays an important role in the synthesis and pharmaceutical engineering of petrochemicals,fine chemicals and natural compounds.At present,olefin epoxidation is one of the main methods for preparing epoxy compounds.In this paper,[TiOA][ReO₄]was applied to the system of epoxidation of cyclooctene to epoxycyclooctene.The optimum reaction conditions and the degree of influence of the catalytic system were determined by three-level three-factor response surface optimization experiments.Under optimal conditions,the yield of epoxidation of cyclooctene to epoxycyclooctene was 90.13%and the selectivity was greater than99%.Comprehensive analysis of the impact of various factors on the yield:catalyst dosage>oxidizer dosage>solvent dosage.In this paper,we introduced rare metal rhenium into ionic liquids,which enlarges the kinds and applications of ionic liquids.It provides important theoretical support for industrial production by perfecting two catalytic systems.It also has good guiding significance for the development of green chemistry and catalytic chemistry.