描述了新型富氢键离子液体的合成,表征以及它们在Diels–Alder反应中的催化性能的研究。D-葡萄糖和氯醇被用作合成离子-液体阳离子的原料和羟基的来源,而弱配位的双(三氟甲基磺酰基)酰亚胺被用作阴离子。用1 H和13分析新的离子液体通过13 C NMR光谱和ESI-MS实验,证实了它们的结构。此外,通过差示扫描量热法和热重分析法测得的离子液体的热数据表明,这些化合物在-29°C至-16°C的温度范围内倾向于形成玻璃,并且在环境温度下具有热稳定性。到至少430°C,最有可能是因为存在双(三氟甲基磺酰基)酰亚胺阴离子。研究了离子液体在环戊二烯与马来酸二乙酯或丙烯酸甲酯的模型反应中的性能。所研究的离子液体即使以催化量存在(相对于亲双烯体为4摩尔%)也显示出高活性。离子液体结构中存在的羟基数目的增加导致更高的反应速率。
Discovery of the Chemical Function of Glycosidases: Design, Synthesis, and Evaluation of Mass-Differentiated Carbohydrate Libraries
摘要:
Discovery of the catalytic chemical function of the many putative glycosidases coded in genomes currently relies on individual testing of possible substrates, usually as their p-nitrophenol conjugate. Herein, we present an alternative chemical proteomics approach using a synthetic mass-differentiated heat-stable substrate library with mass spectrometry readout. Library components do not serve as reaction inhibitors and both primary and secondary enzyme substrates can be delineated.
Synthesis and Surface Active Properties of Novel Carbohydrate-based Cationic Surfactants
作者:Janusz Nowicki、Adam Sokołowski、Dagmara Reksa
DOI:10.1007/s11743-010-1225-4
日期:2011.4
carbohydrate surfactants is presented in this paper. The obtained surfactants have structures that are typical for saponins, which contain fatty amide hydrophobic chains and hydrophilic heads with cationic carbohydrate units. Their surfaceactiveproperties and biodegradability have been studied. For two types, the biodegradability was above 85% and comparable to standard carbohydrate surfactants.
Verfahren zur Herstellung eines Gemisches aus Alpha- und Beta-Chlorethylglucopyranose
申请人:WOLFF WALSRODE AG
公开号:EP0654478A3
公开(公告)日:1995-09-13
Verfahren zur Herstellung eines Gemisches, im wesentlichen bestehend aus α- und β-Chlorethylglucopyranose durch Umsetzung von Chlorethanol mit Glukose, wobei in 2 bis 10 Molen Chlorethanol 1 Mol Glukose bei 100 bis 130°C in Abwesenheit von Katalysatoren vorgelöst wird, wobei gegebenenfalls Wasser abdestilliert werden kann und anschließend bei 60 bis 90°C 1 bis 30 Gew.-% saurer Katalysator, bevorzugt saure anorganische und/oder organische Ionenaustauscher, bezogen auf eingesetzte Glukose, zugesetzt werden und 10 bis 600 Minuten nachgerührt wird.
Efficient glycosylation of unprotected sugars using sulfamic acid: A mild eco-friendly catalyst
作者:Goutam Guchhait、Anup Kumar Misra
DOI:10.1016/j.catcom.2011.07.016
日期:2011.10
Sulfamic acid, a mild and environmentally benign catalyst has been successfully used in the Fischer glycosylation of unprotected sugars for the preparation alkyl glycosides. A diverse range of aliphatic alcohols have been used to prepare a series of alkyl glycosides in good to excellent yield. (C) 2011 Elsevier B.V. All rights reserved.