金属过硫酸盐介导的热氧化有机转化总是需要更高的温度并且经常使用有机溶剂。这项工作的目的是开发过硫酸盐介导的氧化转化,它可以在几乎室温下使用水作为溶剂进行。本报告描述了使用过硫酸胆碱及其预组合物(醋酸胆碱和 K 2 S 2 O 8) 在 40 °C 的水中。还使用了一些其他氮杂环,以良好到极好的产率提供各种芳酰化产物。与可能产生金属盐副产物的金属过硫酸盐不同,本文报道的化学的一个关键特征包括使用含有可生物降解胆碱的环境无害的过硫酸胆碱作为抗衡阳离子,Minisci 反应在 40 °C 下作为唯一的溶剂证明,和过硫酸盐的非常规活化。
Screening ionic liquids for use in biotransformations with whole microbial cells
作者:Nicola Wood、Jamie L. Ferguson、H. Q. Nimal Gunaratne、Kenneth R. Seddon、Royston Goodacre、Gillian M. Stephens
DOI:10.1039/c0gc00579g
日期:——
A wide range of ionic liquids, both water miscible and water immiscible, containing a diverse set of cations and anions, were screened for toxicity towards Escherichia coli K-12, using both Agar Diffusion tests and growth inhibition tests in liquid cultures. The data provide preliminary rules to enable the design of non-toxic ionic liquids for use in biocatalytic processes.
Eco-friendly acetylcholine-carboxylate bio-ionic liquids for controllable <i>N</i>-methylation and <i>N</i>-formylation using ambient CO<sub>2</sub> at low temperatures
作者:Wenfeng Zhao、Xiaoping Chi、Hu Li、Jian He、Jingxuan Long、Yufei Xu、Song Yang
DOI:10.1039/c8gc03549k
日期:——
reaction temperature under solvent or solvent-freeconditions. N-Methylamines (ca. 96% yield) were obtained in acetonitrile at 50 °C, while N-formamides (ca. 99% yield) were attained without a solvent at 30 °C. The established bio-ionic liquid catalytic system found a wide range of applicability in substrates and possessed a high potentiality in scale-up to gram-grade production. The developed catalytic
Nano-magnetic-iron Oxides@choline Acetate as a Heterogeneous Catalyst for the Synthesis of 1,2,3-Triazoles
作者:Abolfazl Mohammadkhani、Akbar Heydari
DOI:10.1007/s10562-021-03739-w
日期:2022.6
In this research, four cholines supported on core–shell iron oxides, Fe2O3@MgO@Ch.OAc (choline acetate), Fe2O3@MgO@Ch.OH (choline hydroxide), Fe3O4@Ch.OAc, Fe3O4@Ch.OH, were synthesized. The synthesized catalysts were tested in 1,2,3-triazoles synthesis by the reaction of nitromethane, aldehyde, and benzyl azide in EtOH as a green solvent. Among four synthesized heterogeneous catalysts, the Fe2O3@MgO@ch
An integrated high-throughput strategy enables the discovery of multifunctional ionic liquids for sustainable chemical processes
作者:Anlian Zhu、Lingjun Li、Chi Zhang、Yutan Shen、Mingjie Tang、Lili Bai、Chunyan Du、Suojiang Zhang、Jianji Wang
DOI:10.1039/c8gc03119c
日期:——
high-throughput preparation of ionicliquids and in situ screening of their reaction-promoting performance in 96-well plates. The integrated approach then enables a facile identification of optimal ionicliquidsfrom a 400-ionic liquid candidate pool to act as the solvent, the catalyst and the separating assistant, simultaneously, for carbonyl-azide cycloaddition reactions. Merits of the ionic liquids-based processes
Diazobicyclo[5.4.0]undec-7ene-ium and tetramethyl guanidium based ionic liquids enhanced thermal stability of xylose reductase at extreme pH through specific ion effect
作者:Shwethashree Malla、K.J. Jisha、Ramesh L. Gardas、Sathyanarayana N. Gummadi
DOI:10.1016/j.molliq.2021.115394
日期:2021.4
liquids on the activity and stability of DnXR was investigated in terms of thermodynamic parameters, half-life time as well as the intrinsic tryptophan fluorescence at pH 5.0, 7.0 and 10.0. [TMG][But] and [DBU][Acetate] were effective in improving the enzymeactivity at pH 10.0 by 72% and 58%. [TMG][Acetate] increased the functional stability at pH 10.0 by 10-fold while maintaining the activity same as control