- Novel bronsted acidic ionic liquids and their use as dual solvent-catalysts
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The reaction of triphenylphosphine or N-butylimidazole with cyclic sultones gives zwitterions that are subsequently converted into ionic liquids by reaction with trifluoromethane sulfonic acid or p-toluenesulfonic acid. The resulting ionic liquids have cations to which are tethered alkane sulfonic acid groups. These Bronsted acidic ionic liquids are useful solvent/catalysts for several organic reactions, including Fischer esterification, alcohol dehydrodimerization and the pinacol rearrangement. The new ionic liquids combine the low volatility and ease of separation from product normally associated with solid acid catalysts, with the higher activity and yields normally found using conventional liquid acids. Copyright
- Cole, Amanda C.,Jensen, Jessica L.,Ntai, Ioanna,Tran, Kim Loan T.,Weaver, Kristin J.,Forbes, David C.,Davis Jr., James H.
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- Chemical Analysis of Ionic Liquids Using Photoelectron Spectroscopy
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The feasibility of utilizing X-ray photoelectron spectroscopy (XPS) to analyze roomerature ionic liquids (RTILs) was investigated in this study. Conventionally, the chemical structure of organic compounds is identified by nuclear magnetic resonance (NMR) spectroscopy. The properties of RTILs, especially their low vapor pressure, make it possible to analyze RTILs by using XPS. The usefulness of XPS on RTILs was confirmed by commercial RTILs. All atoms in RTILs were detected in survey XPS spectra, and the calculated atomic percentages matched well with theoretical values. After the verification of commercial RTILs by XPS, we synthesized three RTILs and investigated them with XPS. The atomic ratio and chemical environment of carbon in RTILs were verified by XPS. By adapting XPS to the investigation of RTILs, carbon atoms in different chemical environments were distinguishable by the binding energy shift, and the atomic ratio of the constituent atoms was identifiable after peak deconvolution. In addition, inorganic constituents were detected by XPS unlike in the case of NMR spectroscopy.
- Seo, Sungyong,Park, Juyun,Kang, Yong-Cheol
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p. 355 - 360
(2016/03/15)
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- Oligomerisation of isobutene with silica supported ionic liquid catalysts
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Bronsted acidic ionic liquids, supported on silica gel, have been used effectively in oligomerisation of isobutene. The supported catalysts could be used several times without loss of activity or change in selectivity. The ratio of the products could be influenced by the proper choice of the ionic liquid component of the catalyst and the reaction temperature.
- Feher, Csaba,Krivan, Eszter,Hancsok, Jen,Skoda-Foeldes, Rita
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p. 403 - 409
(2012/04/10)
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- Synthesis of 1-octanol and 1,1-dioctyl ether from biomass-derived platform chemicals
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The happy medium: A new catalytic pathway for the synthesis of the linear primary C8?alcohol products 1-octanol and dioctyl ether from furfural and acetone has been developed using retrosynthetic analysis. This opens a general strategy for the synthesis of medium-chain-length alcohols from carbohydrate feedstock.
- Julis, Jennifer,Leitner, Walter
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p. 8615 - 8619
(2012/09/21)
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- Broensted acidic ionic liquids as efficient and recyclable catalysts for the carbonylation of formaldehyde
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Methyl glycolate (MG), as a precursor to ethylene glycol (EG), was synthesized by an efficient and eco-friendly procedure of one-pot, two-step, sequential reaction, including carbonylation and esterification from HCHO with Broensted acidic ionic liquids (BAILs) as catalysts. MG was obtained in high yield under mild conditions. In addition, the catalyst could be recycled eight times after separating the unreacted materials and products from the reaction system by distillation under vacuum and no significant decrease in catalytic activity was observed.
- Song, Heyuan,Li, Zhen,Chen, Jing,Xia, Chungu
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experimental part
p. 81 - 86
(2012/04/10)
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- Intramolecular hydroalkoxylation in Bronsted acidic ionic liquids and its application to the synthesis of (±)-centrolobine
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The SO3H-tethered imidazolium and triazolium salts, nonvolatile and recyclable Bronsted acidic ionic liquids, efficiently mediate intramolecular hydroalkoxylations of alkenyl alcohols. They have been successfully employed in the synthesis of (±)-centrolobine.
- Jeong, Yunkyung,Kim, Do-Young,Choi, Yunsil,Ryu, Jae-Sang
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supporting information; experimental part
p. 374 - 378
(2011/02/28)
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