1124-64-7Relevant articles and documents
Synthesis and characterization of the iron-containing magnetic ionic liquids
Wang, Jieli,Yao, Hongwei,Nie, Yi,Zhang, Xiangping,Li, Jianwei
, p. 152 - 155 (2012)
Three species of room temperature magnetic ionic liquids (ILs) including 1-butyl-3-methylimidazolium tetrachloroferrate ([bmim]FeCl4), N-butylpyridium tetrachloroferrate ([bPy]FeCl4) and 1-butyl-1-methylpyrrolidium tetrachloroferrate ([bmP]FeCl4) were synthesized via two-step in this paper. The intermediates and magnetic ILs were characterized by ultimate analysis, 1H NMR, ESI-MS, FT-IR and Raman. In addition, the three magnetic ILs were quantitatively tested by magnetic property measurement system (superconducting quantum interference device), and the results indicated that they had similar magnetic susceptibilities and paramagnetic properties. This research expanded cationic types of magnetic ILs, and supplied fundamental data to application of magnetic ILs.
Design and synthesis of basic ionic liquids for the esterification of triterpenic acids
Ressmann, Anna K.,Schneider, Maria,Gaertner, Peter,Weil, Matthias,Bica, Katharina
, p. 139 - 148 (2017)
Abstract: We present the design and synthesis of Br?nsted-basic ionic liquids and investigate their application in the microwave-assisted esterification of betulinic acid, aiming towards a benign and pyridine-free manufacturing process of the anti-HIV drug, bevirimat. Graphical abstract: [Figure not available: see fulltext.]
Solvent-mediated photoinduced electron transfer in a pyridinium ionic liquid
Vieira, Rebecca C.,Falvey, Daniel E.
, p. 1552 - 1553 (2008)
The dynamics of electron transfer reactions in butyl pyridinium bis(trifluoromethanesulfonyl)imide (BuPyr-NTf2) and other solvents have been explored using laser flash photolysis. In these experiments, benzophenone (BP), duroquinone (DQ), and 9-cyanoanthracene (9CA) were used as excited-state acceptors, 1,4-diazabicyclo[2.2.2]octane and hexamethylbenzene were used as ground-state donors, and methyl viologen (MV2+) was used as a probe molecule. Analysis of kinetic and spectroscopic data from these experiments shows that electron transfer from photoreduced acceptors to the probe occurs via one or more solvent ions in cases where the acceptor anion radical has a reduction potential that is more negative than the solvent ions (BP?- and 9CA?- in BuPyr-NTf2). Mediated electron transfer was demonstrated to significantly enhance quantum efficiencies of photoinduced electron transfer in cases where back electron transfer would otherwise predominate. Copyright
Photoelectrochemical Behavior of n-GaAs Electrodes in Ambient-Temperature Molten-Salt Electrolytes
Singh, P.,Rajeshwar, K.,DuBow, J.,Job, R.
, p. 4676 - 4681 (1980)
Photoelectrochemical (PEC) characterization of n-GaAs electrodes was carried out in room-temperature molten-salt electrolytes by using the aluminium chloride- butylpyridinium chloride (AlCl3-BPC) system as a representative example.The working potential limits for the above electrodes in the melts, containing varying ratios of AlCl3 and BPC, were established by cyclic voltammetry.Flat-band potential (Vfb) measurements on n-GaAs in the same melts enabled location of the semiconductor band edge positions relative to the melt stability windows.In electrolytes containing AlCl3 and BPC in the 1:1 molar ratio, the available range of potential was wide enough to probe the entire band-gap region.On the other hand, the potentials corresponding to the conduction band edges of n-GaAs were beyond the cathodic stability limit of both the 2:1 and 0.75:1 AlCl3-BPC compositions.The electrode dissolution behavior of illuminated n-GaAs electrodes was investigated by cyclic voltammetry in melts of varying composition containing no intentionally added electroactive species.The onset of photoanodic corrosion currents was significantly positive of the values observed in aqueous electrolytes.The redox behavior of ferrocene-ferricenium ion couple (Fe(Cp)2/Fe(Cp)2+) was studied by cyclic voltammetry on vitreous carbon electrodes in the 2:1, 0.75:1, and 1:1 AlCl3-BPC electrolytes.This couple was electrochemically reversible in the above melts.Photogenerated holes on n-GaAs electrodes were competitively captured by the electrochemically active ferrocene species in the 1:1 AlCl3-BPC electrolyte.This redox reaction occurred quite efficiently at the expense of the parasitic electrode dissolution process as judged by the constancy of photocurrents in a n-GaAs1:1 AlCl3-BPCFe(Cp)2/Fe(Cp)2+C PEC cell under short-circuit conditions for periods up to ca. 1 month.The uderpotentials developed for the photoanodic process on n-GaAs relative to the reversible (dark) thermodynamic values on vitreuos cabon were direct evidence for the sustained conversion of light energy to electrical energy.Rectifying behavior was observed on n-GaAs electrodes, with the reduction waves corresponding to the dark reduction of ferricenium chloride.The occurence of this process at potentials positive of Vfb indicated the mediation of surface states in the electron transfer process.Nonoptimized n-GaAs1:1Fe(Cp)2/Fe(Cp)2+C PEC cells typically showed open-circuit potentials of 680 mV, fill factors around 0.49, and a net optical-to-electrical conversion efficiency of ca. 1percent under illumination with a tungsten lamp at 40 mW/cm2.
Ionic liquids of chelated orthoborates as model ionic glassformers
Xu, Wu,Wang, Li-Min,Nieman, Ronald A.,Angell, C. Austen
, p. 11749 - 11756 (2003)
Ionic liquids based on various chelated orthoborate anions of different N-containing onium cations have been synthesized using an economic synthesis strategy. Most orthoborates do not crystallize. They are found to have much higher glass transition temperatures and room-temperature viscosities than those with perfluorinated anions such as TFSI-, BF4-, and CF3SO3- (Tf-), as predicted from anion polarizability arguments. The ambient conductivities of the new ionic liquids are low relative to those with perfluorinated anions. The transport properties all show that cohesion in these liquids increases, and ionic mobilities decrease, as anion size increases, implying that van der Waals interactions, not Coulomb interactions, have become the controlling influence. In view of their resistance to crystallization, the large range of temperature over which these liquids can be studied, their hydrophobic properties, and their high fragilities, these liquids may provide good model systems for fundamental liquid state investigations and interesting solvents for large-molecule dissolution.
Microwave-assisted synthesis of room-temperature ionic liquid precursor in closed vessel
Khadilkar, Bhushan M.,Rebeiro, Geeta L.
, p. 826 - 828 (2002)
We report here the synthesis of various alkylpyridinium and 1-alkyl-3-methylimidazolium halides on a large scale under microwave irradiation, in a closed vessel. The reaction time was drastically reduced as compared to conventional methods, and good yields were obtained.
Enhanced activity and modified substrate-favoritism of Burkholderia cepacia lipase by the treatment with a pyridinium alkyl-PEG sulfate ionic liquid
Kadotani, Shiho,Nokami, Toshiki,Itoh, Toshiyuki
, p. 441 - 447 (2019/01/04)
Three types of pyridinium salts, i.e., 1-ethylpyridin-1-ium cetyl-PEG10 sulfate (PYET), 1-butylpyridin-1-ium cetyl-PEG10 sulfate (PYBU), and 1-(3-methoxypropyl)pyridin-1-ium cetyl-PEG10 sulfate (PYMP), have been prepared and evaluated for their activation property of Burkholderia cepacia lipase by comparison to the control IL-coated enzymes, 1-butyl-2,3-dimethylimidazolium cetyl-PEG10 sulfate-coated lipase PS (IL1-PS). Among the tested pyridinium salt-coated lipases, the PYET-coated lipase PS (PYET-PS) exhibited the best results; the transesterification of 1-(pyridin-2-yl)ethanol, 1-(pyridin-3-yl)ethanol, 1-(pyridin-4-yl)ethanol, or 4-phenylbut-3-en-2-ol proceeded faster than those of the IL1-PS-catalyzed reaction while maintaining an excellent enantioselectivity (E > 200). This improved efficiency was found to be dependent on the increased Kcat value.
Preparation method of alkylsalicylic acid and/or alkylsalicylate
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Paragraph 0045-0047, (2018/05/30)
The invention provides a preparation method of alkylsalicylic acid and/or alkylsalicylate. The preparation method of alkylsalicylic acid and/or alkylsalicylate comprises the following steps: alpha-olefin, salicylic acid and/or salicylate are subjected to an alkylation reaction under the action of a catalyst, and a product is collected, wherein the catalyst is prepared from an ionic liquid, polyphosphoric acid and organic acid salt by mixing at 30-100 DEG C for 1-12 h. The method has the advantages of high conversion rate, good product selectivity, relatively mild reaction conditions, easily recovered catalyst and the like, and is a green and pollution-free preparation process.
