Functionalized ionic liquids based on imidazolium cation: Synthesis, characterization and catalytic activity for N-alkylation reaction
摘要:
The novel functionalized ionic liquids based on imidazolium cation are synthesized and characterized by studying its H-1, C-13, and P-31 NMR and elemental analysis. These ionic liquids have been reported as a highly efficient catalyst for N-alkylation reaction of aniline with butyl chloride. The reaction was efficiently performed in ionic liquid as an environmentally benign solvent with good yields without transition metal. (C) 2015 Elsevier B.V. All rights reserved.
Design and Preparation of Room-Temperature Ionic Liquids Containing Biodegradable Side Chains
作者:N. Gathergood、P. J. Scammells
DOI:10.1071/ch02148
日期:——
Novel room-temperature ionic liquids with potential sites of enzymatic hydrolysis have been prepared and tested for biodegradable properties.
制备了具有潜在酶水解位点的新型室温离子液体,并对其生物降解特性进行了测试。
TEMPO and Carboxylic Acid Functionalized Imidazolium Salts/Sodium Nitrite: An Efficient, Reusable, Transition Metal-Free Catalytic System for Aerobic Oxidation of Alcohols
作者:Cheng-Xia Miao、Liang-Nian He、Jin-Quan Wang、Jing-Lun Wang
DOI:10.1002/adsc.200900285
日期:2009.9
to >99%, even at ambient conditions. Notably, the catalyst system could preferentially oxidize a primary alcohol to the aldehyde rather than a secondary alcohol to the ketone. Moreover, the reaction rate is greatly enhanced when a proper amount of water is present. And a high turnover number (TON 5000) is achieved in the present transition metal-freeaerobiccatalyticsystem. Additionally, the functionalized
一种有效的催化系统,包括2,2,6,6-四甲基哌啶-1-氧基(TEMPO)官能化咪唑鎓盐([Imim-TEMPO] + X - ),羧酸取代的咪唑鎓盐([Imim-COOH] + X −)和亚硝酸钠(NaNO 2)被开发用于即使在环境条件下,脂族,烯丙基,杂环和苄基醇有氧氧化为相应的羰基化合物,具有高达> 99%的优异选择性。值得注意的是,催化剂体系可以优先将伯醇氧化成醛而不是仲醇氧化成酮。此外,当存在适量的水时,反应速率大大提高。在目前的无过渡金属需氧催化系统中,获得了很高的周转率(TON 5000)。此外,官能化的咪唑鎓盐可成功重复使用至少四次。因此,通过使用本任务特定的离子液体代替有毒和易挥发的添加剂,该过程代表了将酒精有氧氧化为羰基化合物的绿色途径,2或HCl),这是无过渡金属的好氧氧化醇所必需的。
Experimental and theoretical studies on imidazolium ionic liquid-promoted conversion of fructose to 5-hydroxymethylfurfural
A combined experimental and computational study on the imidazolium ionic liquid-promoted conversion of fructose to 5-hydroxymethylfurfural (HMF) was performed. In particular, 1-butyl-3-methyl-imidazolium bromide (BMImBr) was found to be unexpectedly effective for conversion of fructose into HMF without utilizing any other additive or catalyst. Under the optimized conditions, nearly 100% conversion of fructose with a 95% yield of HMF could be obtained. In addition, BMImBr could be easily recovered and reused over 6 times without significant loss of activity. This protocol represents a simple, recyclable and environmentally friendly pathway for HMF production. Furthermore, the detailed mechanism of the BMImBr-promoted conversion of fructose into HMF was also studied through an in situ FT-IR technique, NMR and density functional theory calculations, and demonstrated that the hydrogen bond interaction between BMImBr and fructose could play an important role in promoting the dehydration of fructose. This work also provides further understanding at the molecular level of the reaction process for ionic liquid-promoted conversion of fructose to HMF.
Catalytic Hydrocarbon Functionalization with Gold Complexes Containing N‐Heterocyclic Carbene Ligands with Pendant Donor Groups
作者:Manuela Delgado‐Rebollo、Álvaro Beltrán、Auxiliadora Prieto、M. Mar Díaz‐Requejo、Antonio M. Echavarren、Pedro J. Pérez
DOI:10.1002/ejic.201101158
日期:2012.3
A series of silver and goldcomplexes bearing N-heterocyclic carbeneligands with a –CH2CO2Et pendantgroup attached to one N atom of the NHC ligand have been prepared. The catalytic properties of the goldcomplexes toward the decomposition of ethyl diazoacetate (N2CHCO2Et) and the transfer of the carbene CHCO2Et group to benzene and hexane have been investigated. A somewhat different reaction outcome
anionic surfaceactiveionicliquids (SAILs), 3-methyl-1-ethoxycarbonylimidazolium decanesulfonate ([Etmim][C10H21SO3]) and 3-methyl-1-ethoxycarbonylimidazolium dodecanesulfonate ([Etmim][C12H25SO3]) were synthesized and studied. The surface properties, aggregation properties and thermodynamic parameters of [Etmim][C10H21SO3] and [Etmim][C12H25SO3] aqueous solutions were determined using surface tension