Ionic liquids as reagents and solvents in conjunction with microwave heating: rapid synthesis of alkyl halides from alcohols and nitriles from aryl halides
摘要:
We show that using ionic liquids as reagents in conjunction with microwave heating it is possible to prepare primary alkyl halides from the corresponding alcohols rapidly. Using ionic liquids as solvents in conjunction with microwave heating it is possible to prepare aryl nitriles from the corresponding aryl bromides or iodides. The scope and limitations of using microwave-promotion as a tool in these reactions is discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis and Glutathione Peroxidase-like activity of N-heterocyclic carbene derived cationic diselenides
作者:Sudesh T. Manjare、Harkesh B. Singh、Ray J. Butcher
DOI:10.1016/j.tet.2012.09.024
日期:2012.12
Water soluble cationic diselenide derivatives of benzimidazolin-2-selenones and imidazolin-2-selenones have been synthesized. The Glutathione Peroxidase-like (GPx-like) activities of cationic diselenides have been investigated for the first time. The GPx-like activities are found to be quite low as compared to the neutral imidazole based diselenide and intramolecularly coordinated diselenides. A mechanism
Tetra-coordinated zinc imidazoline selone complexes were synthesized and utilized as potential catalysts in the thioetherification of aryl halides without scrubbing oxygen.
四配位锌咪唑咪唑硒酮配合物被合成并用作潜在催化剂,用于芳基卤化物的硫醚化反应,无需除氧。
Synthesis and properties of N,N′-dialkylimidazolium bis(nonafluorobutane-1-sulfonyl)imides: a new subfamily of ionic liquids
作者:Ser Kiang Quek、Ilya M. Lyapkalo、Han Vinh Huynh
DOI:10.1016/j.tet.2006.01.015
日期:2006.3
derivatives with various readily available alkylating reagents, followed by anion exchange with highly stable and non-hygroscopic potassium bis(nonafluorobutane-1-sulfonyl)imide. The latter was obtained by an improved method starting from ammonium chloride and nonafluorobutane-1-sulfonyl fluoride. The quaternary imidazolium salts thus obtained constitute a new subfamily of thermally stable and remarkably
Effect of Alkyl Chain Branching on Physicochemical Properties of Imidazolium-Based Ionic Liquids
作者:Lianjie Xue、Eshan Gurung、George Tamas、Yung P. Koh、Michael Shadeck、Sindee L. Simon、Mark Maroncelli、Edward L. Quitevis
DOI:10.1021/acs.jced.5b00658
日期:2016.3.10
thermally more stable than branched ILs. Pulsed-gradient spin–echo (PGSE) NMR diffusion measurements show that the self-diffusion coefficients of the ions vary inversely with the viscosities according to the Stokes–Einstein (SE) equation. The hydrodynamic radii of the cations and anions of linear ILs calculated from the SE equation however are consistently higher than those of the corresponding branched
支链离子液体(ILs)1-(异烷基)-3-甲基咪唑鎓双[(三氟甲烷)磺酰基]酰胺([(N – 2)mC N -1 C 1 im] [NTf 2 ],N = 3– 7)合成并对其理化性质进行了表征,并与线性ILs 1-(n-烷基)-3-甲基咪唑鎓双[(三氟甲烷)磺酰基]酰胺([C N C 1 im] [NTf 2 ]与N = 3–7)。对于N = 4–7,支链IL的密度[(N – 2)mC N –1 C 1 im] [NTf2 ]在测量的标准不确定度内与其线性模拟[C N C 1 im] [NTf 2 ]相同。在N= 3 [1mC 2 C 1 im] [NTf 2 ] / [C 3 C 1 im] [NTf 2 ]对的情况下,支链IL的密度比线性IL的密度高0.13%。对于具有给定N的支链/线性IL对,支链IL的玻璃化转变温度T g,熔融温度T m和粘度η高于线性IL。[2mC 3 C1
Abnormal C5-Bound N-Heterocyclic Carbenes: Extremely Strong Electron Donor Ligands and Their Iridium(I) and Iridium(III) Complexes
作者:Anthony R. Chianese、Anes Kovacevic、Brian M. Zeglis、J. W. Faller、Robert H. Crabtree
DOI:10.1021/om049903h
日期:2004.5.1
Imidazolium salts are found to bind abnormally via C5 to iridium(I) and iridium(III) to give air-stable monodentate N-heterocycliccarbenecomplexes. Abnormalligand binding was verified by X-ray diffraction in both Ir(I) and Ir(III) complexes. In the case of Ir(I), it is necessary to block the C2 and C4positions to form a stable sterically protected C5-bound complex. Infrared spectroscopy on carbonyl
发现咪唑鎓盐通过C5与铱(I)和铱(III)异常结合,生成空气稳定的单齿N-杂环卡宾配合物。通过X射线衍射在Ir(I)和Ir(III)络合物中验证了异常的配体结合。在Ir(I)的情况下,有必要封闭C2和C4的位置以形成稳定的,受空间保护的C5结合的复合物。羰基衍生物的红外光谱表明,异常结合的N-杂环卡宾比其普遍存在的C2结合的对应物更强大的电子供体。相对于ca的1-异丙基-2,4-二苯基-3-甲基咪唑啉-5-亚烷基的Tolman电子参数为2039 cm - 1。2050厘米- 1为典型的NHC。