专业从事离子液体的合成、应用及其相关技术的研究工作----Lanzhou Greenchem ILs/青岛奥立科

• Developing effective catalyst system for reductive carbonylation of nitrobenzene based on the diversity of ionic liquids
• 更新时间：2014-04-09；信息类型：SCI论文
• Based on the diversity of ionic liquids, i.e. tunable structure and physicochemical properties, a series of functional ionic liquids and palladium complexes were investigated, and a highly effective catalyst system, Pd(phen)Cl2-BAcImPF6 ionic liquid (phen = 1,10-phenanthroline; BAcIm = 1-butyl-3-acetic acid-imidazolium), was developed for the reductive carbonylation of nitrobenzene to give the corresponding carbamate with higher than 90% of conversion and selectivity at 150 ◦C and 6MPa carbon monoxide. The high catalytic performance is attributed to the acidic function of the BAcImPF6 ionic liquid and the interaction between Pd(phen)Cl2 and the ionic liquid to form the catalytically active palladium complex Pd(phen)2(PF6)2.
• 链接地址：http://www.ionike.com/download/article/2014-04-09/100.html

• Neutral ionic liquid [BMIm]BF4 promoted highly selective esterification of tertiary alcohols by acetic anhydride
• 更新时间：2014-04-09；信息类型：SCI论文
• Esterification of tert-butanol by acetic anhydride, a typical acid–base catalytic reaction, was conducted with excellent selectivity and high yield in a neutral ionic liquid [BMIm]BF4 (1-butyl-3-methylimidazolium tetrafluoroborate). Many other tertiary alcohols could also be successfully converted to the corresponding esters in [BMIm]BF4. Separation of product and recovery and reuse of ionic liquid are all convenient in this system. Here, the need for catalysts is avoided through the use of catalytically active ionic liquids as solvents.
• 链接地址：http://www.ionike.com/download/article/2014-04-09/99.html

• Clean Beckmann rearrangement of cyclohexanone oxime in caprolactambased Brønsted acidic ionic liquids
• 更新时间：2014-04-09；信息类型：SCI论文
• The Beckmann rearrangement of cyclohexanone oxime to afford caprolactam in a novel caprolactam-based Brønsted acidic ionic liquid as catalyst and reaction medium proceeded with high conversion and selectivity at 100 ℃. The occurrence of the Beckmann rearrangement of cyclohexanone oxime in such a Brønsted acidic IL was also confirmed with in situ FT-Raman observation. The key point is that the caprolactam product was one component of the ionic liquid, and a dynamic exchange between the resulting caprolactam product and the caprolactam from the ionic liquid is expected. Therefore, the strong chemical combination between the caprolactam product and the acidic ionic liquid was greatly decreased and the desired product in the solid was recovered through extraction with organic solvent after the reaction.
• 链接地址：http://www.ionike.com/download/article/2014-04-09/98.html

• Green and moisture-stable Lewis acidic ionic liquids (choline chloride·xZnCl2) catalyzed protection of carbonyls at room temperature under solvent-free conditions
• 更新时间：2014-04-09；信息类型：SCI论文
• Choline chloride·xZnCl2 (x = 1–3) or benzyltrimethylammonium chloride·xZnCl2 have been used as efficient and recyclable catalysts for protection of carbonyls to 1,3-dioxolanes and 1,3-dioxanes at room temperature under solvent-free conditions. FT-IR investigation demonstrates the four ionic liquids have similar Lewis acid strength, which is in agreement with the activities observed in the acetalization reaction. The catalytic system choline chloride·xZnCl2 can be reused up to five times without appreciable loss of activity. The simple procedures as well as easy recovery and reuse of this novel catalytic system are expected to contribute to the development of more benign acetalization procedure of carbonyl compounds.
• 链接地址：http://www.ionike.com/download/article/2014-04-09/94.html

• Highly efficient Beckmann rearrangement and dehydration of oximes
• 更新时间：2014-04-06；信息类型：SCI论文
• Under mild conditions, Beckmann rearrangement of a variety of ketoximes could proceed in the presence of chlorosulfonic acid using toluene as a solvent with excellent conversion and selectivity. This procedure could also be applied in the dehydration of aldoximes for obtaining the corresponding nitriles.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/47.html

• Stereoselective synthesis of 9-b-D-arabianofuranosyl guanine and 2-amino-9-(b-D-arabianofuranosyl)purine
• 更新时间：2014-04-06；信息类型：SCI论文
• 9-beta-D-Arabianofuranosyl guanine (6) and 2-amino-9-(beta-D-arabianofuranosyl)purine (8) were prepared from 2-amino-6-chloro-9-(2,3,5-triphenylmethoxyl-p-D-arabianofuranosyl)purine (4), a key intermediate which was stereoselectively prepared from 2,3,5-triphenylmethoxyl-D-arabianofuranose and 2-amino-6-chloro-purine. The yield of the intermediate was obviously improved and only P-isomer was formed by using the activated molecular sieve as environmental friendly catalyst, overcoming the defect that a 1: 1 mixture of alpha- and beta-isomers was formed, which was difficult to separate, when toxic mercury cyanide was previously used as catalyst.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/46.html

• Silica Gel Confined Ionic Liquid-Metal Complexes for Oxygen-Free Carbonylation of Amines and Nitrobenzene to Ureas
• 更新时间：2014-04-06；信息类型：SCI论文
• A new kind of silica gel confined ionic liquid containing a metal complex as heterogenized catalysts was prepared for the carbonylation of amines and nitrobenzene without molecular oxygen to afford the corresponding ureas with greatly enhanced catalytic activity (TOF exceeded 11000mol.mol(-1). h(-1)), with a much lower amount of ionic liquids being needed, with easy catalyst separation and possible reusability, and avoidance of the using of explosive CO + O-2 gas mixtures. Such an enhancement in catalytic activity may be derived from the effect of a high concentration of ionic liquid containing a metal complex due to the confinement into the nanopores or cavities of the silica gel matrix.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/45.html

• From CO Oxidation to CO2 Activation: An Unexpected Catalytic Activity of Polymer-Supported Nanogold
• 更新时间：2014-04-06；信息类型：SCI论文
• J. AM. CHEM. SOC. 2005, 127, 4182-4183.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/44.html

• Environmentally friendly Beckmann rearrangement of oximes catalyzed by metaboric acid in ionic liquids
• 更新时间：2014-04-06；信息类型：SCI论文
• Beckmann rearrangement of several oximes catalyzed by metaboric acid was studied in room temperature ionic liquids. Especially for conversion of cyclohexanone oxime into e-caprolactam, excellent conversion and selectivity were obtained.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/43.html

• Pechmann Reaction in Non-Chloroaluminate Acidic Ionic Liquids under Solvent-Free Conditions
• 更新时间：2014-04-06；信息类型：SCI论文
• Four non-chloroaluminate acidic ionic liquids have been used as catalysts for Pechmann condensations of phenols under solvent-free conditions. SO3H-functionalized trifluoromethanesulfonate imidazolium ionic liquid has proved to be the most active catalyst. Ionic liquid loads as low as 5 mol % can be used leading to high yields with activated phenols at an oil bath temperature of 80 degrees C. The acidities of the four ionic liquids have also been tested using the Hammett method in dichloromethane. The results are consistent with their catalytic activities as observed in the Pechmann reaction of resorcinol. This methodology offers significant improvements for the synthesis of coumarins with regard to yield of products, simplicity in operation, and green aspects by avoiding toxic catalysts and solvents.
• 链接地址：http://www.ionike.com/download/article/2014-04-06/42.html