合成了三种具有 L-Pro 阴离子的新型手性磁性离子液体 (MIL) 并应用于构建手性磁性离子液体水性两相体系 (手性 MILATP)。这是首次报道的手性 MILATP,在外消旋氨基酸的萃取拆分方面显示出巨大的潜力。在这项工作中,这些手性 MILATP ([C n MIM-Tempo][L-Pro](n=2-4) + K 2 CO 3 /K 3 PO 4 /Na 2 CO 3 / Na 2 SO 4 + H 2O) 是在 298.15 K 的温度下测量的。三个经典的经验方程包括 Merchuk 方程被应用于实验双节点数据的相关性以获得双节点曲线。取得了令人满意的相关性能。无机盐的筛选表明,K 2 CO 3和K 3 PO 4是比Na 2 CO 3和Na 2 SO 4更好的盐析试剂。手性MIL种类的研究表明,当n的值在2-4的范围内时,具有较长阳离子烷基链长度的手性MIL具有更好的成相能力。此外,含有
chemoselective oxidation of alcohols is investigated. These new catalysts show high catalytic activity in water and can be reused for the next run by extraction of products. Recycling experiments exhibit that ion-supported TEMPO can be reused up to five times without loss of catalytic activity. This system offers a very clean, convenient, environmentally benign method for the selectiveoxidation of alcohols
TEMPO-Derived Task-Specific Ionic Liquids for Oxidation of Alcohols
作者:Lian-Xun Gao、Xue-E Wu、Li Ma、Meng-Xian Ding
DOI:10.1055/s-2005-862396
日期:——
A novel 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical bearing an ionic liquid-type appendage has been prepared, and its catalytic activity for the selective oxidation of alcohols to the corresponding carbonyl compounds in ionic liquid-aqueous biphasic conditions has been investigated. The ionic liquid-supported TEMPO radical shows catalyst properties similar to those of non-supported counterpart in terms of activity and selectivity, and can be easily recycled and reused without loss of activity and selectivity.
The first bimagnetic ionic liquid based on Fe and TEMPO with cooperative functionalities not only exhibited strong paramagnetic behaviour at room temperature under an applied magnetic field of 5000 Oe but also proved to be an effective catalyst for selective aerobicoxidation of aromatic alcoholsundermild and clean conditions.
Probing Local pH Change during Electrode Oxidation of TEMPO Derivative: Implication of Redox-Induced Acidity Alternation by Imidazolium-Linker Functional Groups
作者:Jeongmin Yeo、Kyungmi Kim、Seung Jae Kwak、Mi Song Kim、Jung Hoon Yang、Won Bo Lee、YongJoo Kim、Junghyun Chae、Jinho Chang
DOI:10.1021/acs.analchem.3c05796
日期:2024.4.9
the conjugated imidazolium-linker functional group of 4-[2-(N-methylimidazolium)acetoxy]-2,2,6,6-tetramethylpiperidine-1-oxyl chloride (MIMAcO-T), which was studied in comparison with 4-hydroxyl-TEMPO (4-OH-T). Voltammetric hysteresis is observed during the electrode oxidation of 4-OH-T and MIMAcO-T at a Pt UME in an unbuffered aqueoussolution. The hysteresis arises from the pH-dependent formation
Self-Neutralizing in Situ Acidic CO<sub>2</sub>/H<sub>2</sub>O System for Aerobic Oxidation of Alcohols Catalyzed by TEMPO Functionalized Imidazolium Salt/NaNO<sub>2</sub>
A reversible in situ acidic catalytic system comprising recyclable TEMPO functionalized imidazolium salt ([Imim-TEMPO][Cl])/NaNO2/CO2/H2O was developed for selective transformation of a series of aliphatic, allylic, heterocyclic, and benzylic alcohols to the respective carbonyl compounds. Notably, the system avoids any conventional acid and can eliminate unwanted byproducts, facilitate reaction, ease separation of the catalyst and product, and also provide a safe environment for oxidation involving oxygen gas.