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.
Synthesis of task-specific imidazolium ionic liquid as an efficient catalyst in acetylation of alcohols, phenols, and amines
Chaubey, Snehkrishn A.,Mishra, Roli
, p. 3259 - 3268 (2020/04/17)
Herein, we report the synthesis of task-specific amino-functionalized imidazolium ionic liquid, acetate1-(2-tert-butoxycarbonylamino-ethyl)-3-methyl-3H-imidazol-1-ium; (Boc-NH-EMIM.OAc), as an efficient catalyst for the acetylation of alcohols, phenols, and amines in the presence of acetic anhydride (acetylating reagent). Remarkably, acetic anhydride in the presence of 10?molpercent of catalyst (Boc-NH-EMIM.OAc) under solvent-free conditions showed excellent acetylation activity in shorter duration of time. On the basis of this, a general procedure for acetylation of alcohols, phenols, and amines has been developed. The ionic liquid (Boc-NH-EMIM.OAc) can be readily recovered and reused successfully up to four consecutive cycles without any significant loss of its catalytic activity. We have been able to show that this acetylating method has many advantages. It gives high yields, takes shorter time, and develops the possibility of benign environmental-friendly process.