这项工作研究了反离子对以磺酸功能化的丁基咪唑碱为均相酸催化剂的离子液体 (IL) 性能的强烈影响。通过伏安分析,表明离子液体中磺酸基团的质子与氯离子和硫酸氢根阴离子的可用性有很大不同,从而影响它们作为酸催化剂的固有活性。该研究的重点是 1-(4-磺酸)-丁基-3-甲基咪唑鎓 ([bsmim]) 和 1-(4-磺酸)-丁基-咪唑鎓 ([bsHim]) 的氯化物和硫酸氢盐,以及评估这些 IL 作为催化剂的测试反应是对硝基苯乙酸酯与甲醇的酯交换。在含有反离子硫酸氢盐的离子液体中,磺酸基团的质子与离子液体的 H 键网络的构建密切相关,因此,在这些 IL 上验证的测试反应的可接受催化活性主要由始终与离子对一起存在的游离硫酸维持。相反,具有氯抗衡离子的 IL 更符合松散的网络,其中来自磺酸基团的质子很容易获得并允许有效催化反应,而与可能与离子对一起的游离盐酸的量无关。值得注意的是,在非磺化碱 1-丁基-咪唑鎓
Synthesis and in vitro evaluation of tetrahydropyridines as potential CDK2 and DprE1 inhibitors
摘要:
The synthesized derivatives have been screened for their anticancer and anti-tubercular evaluation against MCF-7 cell lines and Mycobacterium tuberculosis respectively. The compound 4e showed the highest anticancer activity while the compound 4h showed the highest anti-tubercular activity. The in vitroevaluation has been supported by computational methods such as molecular docking, density functional
PALLADIUM CATALYST SYSTEM COMPRISING ZWITTERION AND/OR ACID-FUNCTIONALYZED IONIC LIQUID
申请人:Riisager Anders
公开号:US20110065950A1
公开(公告)日:2011-03-17
The present invention concerns a catalyst system in particular a catalyst system comprising Palladium (Pd), a zwitterion and/or an acid-functionalized ionic liquid, and one or more phosphine ligands, wherein the Pd catalyst can be provided by a complex precursor, such as Pd(CH
3
COO)
2
, PdCl
2
, Pd(CH
3
COCHCOCH
3
), Pd(CF
3
COO)
2
, Pd(PPh
3
)
4
or Pd
2
(dibenzylideneacetone)
3
. Such catalyst systems can be used for e.g. alkoxycarbonylation reactions, carboxylation reactions, and/or in a co-polymerization reaction, e.g. in the production of methyl propionate and/or propanoic acid, optionally in processes forming methyl methacrylate and/or methacrylic acid. Catalyst systems according to the invention are suitable for reactions forming separable product and catalyst phases and supported ionic liquid phase SILP applications.
Mechanistic studies on counter-ionic effects of camphorsulfonate-based ionic liquids on kinetics, thermodynamics and stereoselectivity of β-amino carbonyl compounds
Catalysis is important in various applications of organic chemistry and its output product control for stereoselective compounds is outrageous. Establishment of experimental facts of stereoselective compounds from catalysis and their validation using theoretical evidences is the key to understand various mechanisms of optically active compounds. A family of new ionicliquids (ILs) with various imidazolium
An imidazolium based Brønsted–Lewis acidicionicliquid has been shown to be an excellent catalyst and reaction medium for the tetrahydropyranylation of various alcohols in good to excellent yields with short reaction times. Selective protection of benzyl alcohol in the presence of phenol was achieved. The novel ionicliquid was prepared from readily available starting materials and could be easily
Development of a simple route for the catalytic conversion of starch-based industrialwaste (potato peels) and potato starch into reducing sugars was investigated in two ionic liquids for comparison – 1-allyl-3-methylimidazolium chloride [AMIM]Cl and 1-(4-sulfobutyl)-3-methylimidazolium chloride [SBMIM]Cl. Over a two hour period, a 20 wt% solution containing up to 43% and 98% of reducing sugars at
1-(1-Alkylsulfonic)-3-methylimidazolium chloride as a reusable Brønsted acid catalyst for the regioselective azidolysis of epoxides under solvent-free conditions
chloride as a new, green, and reusable Bronsted acid catalyst was prepared. In this protocol, we used for the regioselective ring-opening reactions of various epoxiodes with sodium azide to afford the corresponding β -azido alcohols in excellent yields and short reaction time under mild and neutral reaction conditions. This method offers several advantages including excellent regioselectivity, clean reactions