Dispersive liquid–liquid microextraction of silver nanoparticles in water using ionic liquid 1-octyl-3-methylimidazolium hexafluorophosphate
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Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF 6 ] Extraction of several chloro compounds from water has been examined. As the extracting liquid the 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF 6 ], which is common hydrophobic ionic liquid, was used. Additionally, extraction of selected chlorinated compounds from tert-butylmethylether (MTBE) was investigated. The obtained results show the usefulness of [BMIM][PF 6 ] to remove the organic impurities from water, particularly at the concentration range inappropriate for biological purification plants.
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The key intermediate, l-butyl-3-methylimidazolium bromide, was synthesized efficiently from 1-methylimidazole and l-bromobutane.The influence of temperature and reaction heat of itself on this reaction was also investigated. After anion exchanging, room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate was obtained in 92% yield.The structure of final product was confirmed by IR and 1HNMR spectral data.
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Abstract The room temperature ionic liquid, 1‐ n ‐butyl‐3‐methylimidazolium hexafluorophosphate [bmim][PF 6 ] is used as a ‘green’ recyclable alternative to classical molecular solvents for the cyclocondensation of α‐tosyloxyketones with thiobenzamide to prepare 2‐phenylthiazoles in good yields.
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The synthesis of ferrocenyl esters has been achieved using the DCC/DMAP protocol in the ambient temperature ionic liquids 1-butyl-3-methylimidazonium tetrafluoroborate ([bmim][BF4]) and 1-butyl-3-methylimidazonium hexafluorophosphate ([bmim][PF6]). Yields are very high and efficient recycling of solvent was achieved.
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The alkyl imidazolium-based ionic liquids,1-n-butyl-3-methylimidazole methyl carbonate([n-BMIM]OCO2Me) and 1,2-dimethyl-3-ethylimidazole ethyl carbonate(OCO2Et),were synthesized from N-methylimidazole,1,2-dimethylimidazole and carbonates.Reacting with HBF4 and HPF6 at room temperature,[n-BMIM]OCO2Me and OCO2Et were converted into four ionic liquids: 1-n-butyl-3-methylimidazolium tetrafluoroborate([n-BMIM]BF4),1-n-butyl-3-methylimidazolium hexafluorophosphate([n-BMIM]PF6),1,2-dimethyl-3-ethylimidazolium tetrafluoroborate(BF4),and 1,2-dimethyl-3-ethylimidazolium hexafluorophosphate(PF6).The six ionic liquids were characterized and analysed.Environmental pollution was avoided by the green chemical synthetic method in comparison with the traditional two-step synthesis.
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Room temperature ionic liquids (RTILs) are potential alternative solvents in chemical reaction or separation process. The viscosity of RTIL, interfacial properties of air−RTIL, organic compounds−RTIL, and solid−RTIL are of general importance. The viscosities of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) and 1-isobutenyl-3-methylimidazolium tetrafluoroborate ([iBeMIM][BF4]) ionic liquids (ILs) have been determined from (288.15 to 313.15) K. The surface tension/contact angle on solids of [BMIM][PF6] and [iBeMIM][BF4] ILs have been measured at 298.15 K. The liquid−liquid interfacial tension for [BMIM][PF6] with 21 organic compounds have also been determined at 298.15 K. The relationship between the interfacial tensions and activity coefficients at infinite dilution of solutes in IL is discussed.
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Under microwave irradiation,1-butyl-3-methylimidazolium hexafluorophosphate(PF6) ionic liquid was synthesized by one-step method.All reaction factors affecting the yield of the product were investigated.The results showed the optimal reaction conditions as follows: the molar ratio of 1-bromobutane,1-methylimidazole and KPF6 was 1.1∶1∶1.6,the temperature was 70 ℃,the power of microwave was 250 W,the time of microwave irradiation was 15 min,the final yield was 92.7%.The structure of the product was confirmed by IR and 1H NMR analysis.
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An easily accessible ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) was synthesized, and characterized using 1H and 13C NMR, and MS. The ionic liquid was demonstrated to be an efficient green solvent for the synthesis of pravadoline, one of non-steroidal drugs. High yield was achieved without the presence of an anhydrous Lewis acid catalyst. The reaction was also successfully carried out using other imidazolium-based ionic liquids, including 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM][PF6]), and 1-octyl-3- methylimidazolium hexafluorophosphate ([OMIM][PF6]). To our best knowledge, this is the first report in Viet Nam on the synthesis of a pharmaceutical chemical in ionic liquids as green solvents.
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The intermediate 1-hexyl-3-methylimidazolium bromide ([HMIM]Br) was synthesized from N-methylimidazolium and 1-hexylbromide under microwave radiation,and 1-hexyl-3-methylimidazolium hexafluorophosphate ( [HMIM]PF6) was then prepared using [HMIM]Br and KPF6 by anion exchange.Compared with traditional methods,the reaction time required was greatly reduced. The structure of the synthesized product was confirmed by FT-IR,1HNMR and 13CNMR,and the purity of the product was determined to be above 99.0% using high performance liquid chromatography.
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Ionic liquids 1-butyl-3-methylimidazolium tetrafluoroborate [bmIm][BF4] and 1-butyl-3-methylimidazolium hexafluorophosphate [bmIm][PF6] were evaluated as reaction media for allylic and benzylic oxidation reactions using manganese dioxide. The use of ionic liquids as an extractant in the reaction work-up was also investigated. Procedures for recycling of the [bmIm][PF6] ionic liquids used in these MnO2 oxidation reactions were also developed.
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