Selective O-methylation of phenols and benzyl alcohols in simple pyridinium based ionic liquids
摘要:
Synthesis of pyridinium based ionic liquids were reported and applied as catalyst for the selective O-methylation of phenols and benzyl alcohols. The reactions were carried out by using dimethylcarbonate (DMC) as the methylating agent. High selectivity, high yield and recyclability of the ionic liquids are important features of the reactions. (C) 2015 Elsevier B.V. All rights reserved.
作者:Teppo O. Leino、Marcus Baumann、Jari Yli-Kauhaluoma、Ian R. Baxendale、Erik A. A. Wallén
DOI:10.1021/acs.joc.5b02271
日期:2015.11.20
The key intermediate, 6-methylazulene, was synthesized from readily available and inexpensive starting materials in 63% yield over two steps. The methylgroup of 6-methylazulene was then used as a synthetic handle to introduce different substituents at the 6-position via two different methods. Subsequently, the 1- and 3-positions were substituted with additional functional handles, such as formyl
Parallel Microwave-Assisted Synthesis of Ionic Liquids and Screening for Denitrogenation of Straight-Run Diesel Feed by Liquid-Liquid Extraction
作者:Miguel A. Ceron、Diego J. Guzman-Lucero、Jorge F. Palomeque、Rafael Martinez-Palou
DOI:10.2174/138620712800194477
日期:2012.4.1
Fifty-six ionicliquids were efficiently synthesized in parallel format under one-pot, solvent-freemicrowave-assisted synthesis. These compounds were evaluated as extracting agents of nitrogen-containing compounds from a real Diesel feed before being submitted to the hydrodesulfurization process to obtain ultralow sulfur Diesel. Our results showed that halogenated ionicliquids are an excellent alternative
Synthesis and characterization of -[2.2](1,6)azulenophane
作者:Klaus Rudolf、T. Koenig
DOI:10.1016/s0040-4039(00)94964-5
日期:1985.1
Two synthetic pathways affording anti-[2.2](1,6)azulenophane via fluoride induced 1,8 elimination from trimethylsilyl-tetraalkylammonium salts are described. Spectral data are reported that allow the structural assignment for the title compound.
the present study was to examine the effectiveness of 23 different synthesized ionicliquids (ILs) on Fusarium culmorum and Fusarium oxysporum growth rate. The strategy of IL synthesis was a structural modification of ionicliquids through changing the polarity of imidazolium and pycolinium cations and replacing halide anions with well known antifungal anions (cinnamate, caffeate and mandelate). The
本研究的目的是检验 23 种不同合成离子液体 (ILs) 对镰刀菌和尖孢镰刀菌生长速率的有效性。IL 合成的策略是通过改变咪唑鎓和 pycolinium 阳离子的极性并用众所周知的抗真菌阴离子(肉桂酸根、咖啡酸根和扁桃酸根)代替卤化物阴离子来对离子液体进行结构修饰。研究结果清楚地表明,阳离子上的烷基链类型是 IL 毒性的最决定因素。为了检查 IL 结构如何影响它们对镰刀菌属的毒性,亲脂性描述符A log P从密度泛函理论计算并与镰刀菌的生长速度。所有这些结果表明,所研究的 ILs 对镰刀菌属的亲脂性和毒性具有高度的相互依赖性。本研究中收集的数据表明,ILs 的抑制作用在尖孢镰刀菌的情况下更为明显。
Expansion of Azulenes as Nonbenzenoid Aromatic Compounds for C–H Activation: Rhodium- and Iridium-Catalyzed Oxidative Cyclization of Azulene Carboxylic Acids with Alkynes for the Synthesis of Azulenolactones and Benzoazulenes
作者:Chanyoung Maeng、Jeong-Yu Son、Seung Cheol Lee、Yonghyeon Baek、Kyusik Um、Sang Hoon Han、Gi Hoon Ko、Gi Uk Han、Kyungsup Lee、Kooyeon Lee、Phil Ho Lee
DOI:10.1021/acs.joc.9b03448
日期:2020.3.6
reactivity order for C-H activation reaction is greater toward azulene-6-carboxylic acid, azulene-1-carboxylic acid, and azulene-2-carboxylic acid. For the first time, the expansion of azulenes having directing group as nonbenzenoid aromatic compounds for C-H activation was successful, indicating that nonbenzenoid aromatic compounds can be used as good substrates for the C-H activation reaction. Therefore,