94280-72-5Relevant articles and documents
Synthesis and performance of piperidinium-based ionic liquids as catalyst for alkylation of p-xylene with 1-hexadecene
Ge, Sujuan,Zhou, Yuming,Sheng, Xiaoli,Mao, Chunfeng,Zhao, Lina,Xu, Jianxing,Qiu, Lei
, (2021)
Piperidinium-based ionic liquids (ILs) were synthesized under mild conditions by coordinating N-alkyl-N-methylpiperidinium bromide ([Pip1,x]Br) with anhydrous AlCl3. The weak basicity of N-methylpiperidine had little impact on downstream problems from proton impurities and catalyst poisoning. The results of Fourier transform infrared (FT-IR), electrospray ionization mass spectrometry (ESI-MS), and nuclear magnetic resonance (27Al NMR) confirmed that the active components in [Pip1,x]Br-2AlCl3 (χ = 0.67) were [Al3Cl9Br]? and [Al2Cl6Br]?. Besides, the reaction performance of [Pip1,8]Br-2AlCl3 under different conditions was carried out by single-factor experiment and further confirmed by orthogonal experimental method. Among these reaction conditions, the optimal combination was the reaction temperature of 40°C, ILs/O molar ratio of 0.2:1, px/O molar ratio of 12:1, and the reaction time of 30 min. Furthermore, [Pip1,8]Br-2AlCl3 had excellent stability and can be recycled 14 times. It was the high-efficiency catalytic activity and prominent recyclability that made continuous industrial production possible.
Newly designed flow reactor as an original method of synthesis of ionic liquids by ion-exchange reactions
Pawlowska-Zygarowicz, Anna
supporting information, (2021/11/16)
Optimization of chemical reactions is often costly and requires a significant investment in both materials and time. The solution to this type of difficulty may be the use of continuous flow systems. With the use of the newly designed continuous flow system, the method of synthesizing ionic liquids (ILs) by ion exchange was optimized. The flow rate of the substrates and the selection of the packing of the column in which the reactions were carried out (random packing or a chemical compound in the form of a solid, which was the source of the anion exchanged) were also optimized. The purity of the obtained ionic liquids and the progress of the reaction was determined using ion chromatography. Additionally, for the ionic liquids, which were the starting compounds for the ion exchange reaction, the basic physicochemical properties were determined, thus extending the data library available for chemical compounds belonging to the group of ionic liquids.
Ultrafast dynamics in nonaromatic cation based ionic liquids: A femtosecond raman-induced kerr effect spectroscopic study
Shirota, Hideaki,Ando, Masatoshi,Kakinuma, Shohei,Takahashi, Kotaro
supporting information, p. 1520 - 1539 (2020/12/29)
Herein, the data of the intermolecular vibrations of forty nonaromatic cation based ionic liquids (ILs) at 293 K measured by femtosecond Raman-induced Kerr effect spectroscopy are reported. The low-frequency spectra in the frequency range of 0.3700 cm11 were obtained by Fourier transform deconvolution analysis. The line shapes of the low-frequency spectra below 3200 cm11 were discussed on the basis of the ion species. The spectral intensity in nonaromatic cation based ILs was much lower than that in aromatic cation based ILs owing to the absence of the aromatic ring, i.e., the libration of the aromatic species had a strong spectral intensity in the low-frequency region. However, nonaromatic cation based ILs with a flat anion, such as dicyanamide and tricyanomethanide, showed stronger spectral intensity because of the libration of the anion. Other unique spectral features were also discussed in the context of the structure of the ion species. Liquid properties, such as density, viscosity, electrical conductivity, and surface tension, were also estimated. On comparing the low-frequency spectra with the bulk liquid properties of the nonaromatic cation based ILs, a mild linear relationship between the first moment of the low-frequency spectrum and a bulk parameter comprised of surface tension and density was observed.
