Imidazolium-containing diselenides for catalytic oxidations with hydrogen peroxide and sodium bromide in aqueous solutions
作者:Eduardo E. Alberto、Antonio L. Braga、Michael R. Detty
DOI:10.1016/j.tet.2012.08.004
日期:2012.12
The design and synthesis of imidazolium-containing diselenides 4a–c is described. The introduction of the N-methylimidazolium group gives freely soluble compounds in water, unlike the majority of common organic diselenides. Catalytic amounts of 4a–c effectively promote bromination of organic substrates using a safe and inexpensive NaBr/H2O2 system in water. Kinetics experiments revealed that the bromination
描述了含咪唑鎓二硒化物4a – c的设计与合成。与大多数常见的有机二硒化物不同,N-甲基咪唑鎓基团的引入可在水中提供可自由溶解的化合物。使用安全和廉价的NaBr / H 2 O 2水溶液,催化量的4a – c可有效促进有机底物的溴化。动力学实验表明,4-戊烯酸的溴化反应对NaBr和H 2 O 2都具有一级依赖性浓度反应速率也对溶液的pH敏感。制备反应表明,与4a相比,二苯基二硒化物5是不良的催化剂,离子液体溴化1-苄基-3-甲基咪唑鎓溴化物6没有与H 2 O 2的催化活性,表明结合的官能团具有协同作用。
Dynamic Covalent Chemistry of Nucleophilic Substitution Component Exchange of Quaternary Ammonium Salts
作者:Sirinan Kulchat、Jean-Marie Lehn
DOI:10.1002/asia.201500604
日期:2015.11
catalyst. Microwave irradiation was used to assist the exchange reactionbetween the pyridinium salts and pyridine derivatives. Finally, experiments towards the generation of dynamic ionic liquids were performed. The results of this study pave the way for the extension of dynamic combinatorial chemistry to nucleophilic substitution reactions.
[EN] METHOD FOR TREATING FIBROSIS AND CANCER WITH IMIDAZOLIUM AND IMIDAZOLINIUM COMPOUNDS<br/>[FR] PROCÉDÉ DE TRAITEMENT DE LA FIBROSE ET DU CANCER AVEC DE L'IMIDAZOLIUM ET DES COMPOSÉS À BASE D'IMIDAZOLINIUM
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2009096905A1
公开(公告)日:2009-08-06
There is presently provided methods for delivering an anti-fibrotic or anti-cancer agent to a cell. The methods comprise contacting a cell with an effective amount of imidazolium and imidazolinium compounds as described herein, including imidazolium and imidazolinium salts.
Improved solubilization of pyromellitic dianhydride and 4,4′-oxydianiline in ionic liquid by the addition of zwitterion and their polycondensation
作者:Masahiro Tamada、Takahiro Hayashi、Hiroyuki Ohno
DOI:10.1016/j.tetlet.2007.01.012
日期:2007.2
for polyimide synthesis. The solubility of 4,4′-oxydianiline and pyromelliticdianhydride as starting materials in ionic liquids was first evaluated, and then their polycondensation was carried out. Although these starting materials were hardly soluble in 1-benzyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide (3), addition of imidazolium type zwitterion, 1-(1-butyl-3-imidazolio)butane-4-sulfonate
制备了三种不同的离子液体,并将其用作聚酰亚胺合成的溶剂。首先评估了4,4'-羟基二苯胺和均苯四甲酸二酐在离子液体中的溶解度,然后进行了缩聚反应。尽管这些原料几乎不溶于1-苄基-3-甲基咪唑双(三氟甲烷磺酰基)酰亚胺(3),但添加咪唑类两性离子,1-(1-丁基-3-咪唑并)丁烷-4-磺酸酯(ZI) ,当然提高了它们的溶解度。当使用含有40mol%ZI的3时,冷却至室温后,没有从该包含两种原料的混合溶液中相分离。在3中制备预聚物后在室温下,在含有40mol%的ZI的情况下,在相同的溶液中于100、200,然后300℃下每1小时进行缩聚,从而得到聚酰亚胺。所获得的聚酰亚胺(在10ml浓硫酸中为0.05g)的固有粘度为1.3dL g -1,高于仅在3个中所制备的特性粘度(0.9dL g -1)。聚酰亚胺较高的平均分子量归因于原料的溶解度的提高,这是因为添加了ZI,从而可以在酰亚胺化前不加热的情况下制备预聚物聚(酰胺酸)。
The role of N-heterocyclic carbene substituents on ruthenium(II) complexes in the catalytic transfer hydrogenation of acetophenone
作者:Muhammet Emin GÜNAY、Gülcan GENÇAY ÇOĞAŞLIOĞLU
DOI:10.3906/kim-1506-15
日期:——
The novel ruthenium(II) complexes [RuCl$_2}$(NHC)($p$-cymene)], \textbf3a}--\textbfe}, containing 1-alkyl-3-benzylimidazol-2-ylidene ligands were prepared. All synthesized compounds were characterized by NMR spectroscopy and elemental analyses. Ru(II)-NHC complexes were tested as catalysts for the transfer hydrogenation of acetophenone, showing modest to high activity in this reaction. The results revealed that efficiencies depend on the substituents of the benzene ring of the benzyl on the N atom of the NHC ring.