用溶胶-凝胶法合成了两种新的对磺酸杯[4]芳烃和对磺酸杯[6]芳烃官能化有机硅,并在酯化反应中用作非均相催化剂。使用羧酸与乙醇的酯化作用评估了催化性能,在最佳反应条件下观察到了良好的催化活性(即55-88%)。这项研究报告了成功使用杯芳烃[ n ]芳烃作为催化酯化反应的非均相催化剂的第一个有希望的例子。催化剂易于通过过滤分离并重复使用五次而活性没有任何显着损失。
Synthesis and investigation of catalytic affinities of water-soluble amphiphilic calix[n]arene surfactants in the coupling reaction of some heteroaromatic compounds
作者:Serkan Sayin、Mustafa Yilmaz
DOI:10.1016/j.tet.2016.08.066
日期:2016.10
their surfactant abilities, and the effects of water amount used and reaction durations on the catalytic activities of these amphiphilic calix[n]arene derivatives were also investigated. Observations indicated that these amphiphilic calix[n]arene catalysts exhibited high catalytic activities in the coupling reactions of 2-methylfuran and N-methylindole with some alcohols in water.
通过引入磺酸基,成功合成了六种具有两亲性的杯芳烃[ n ]芳烃基布朗斯台德酸型催化剂。使用FTIR,1 H NMR,13 C NMR,APT-NMR和元素分析技术对它们的结构进行表征。此外,在2-甲基呋喃和/或N-甲基吲哚与某些仲醇在水性介质中的偶联反应中评估了它们的催化能力。还研究了它们的表面活性剂能力,水用量和反应时间对这些两亲杯芳烃[ n ]芳烃衍生物的催化活性的影响。观察表明,这些两亲杯[在2-甲基呋喃和N-甲基吲哚与某些醇在水中的偶联反应中,n ]芳烃催化剂表现出高催化活性。
Calix[n]arenes: active organocatalysts for the synthesis of densely functionalized piperidines by one-pot multicomponent procedure
been developed for the synthesis of different densely functionalizedpiperidinederivatives via pseudo-five component, one-pot domino reaction through a combination of β-ketoesters, aromatic aldehydes, and various amines using p-sulfonic acid calix[n]arenes as catalysts. The reaction was carried out in refluxing methanol, affording very good yields of the expected piperidine. Atomic economy, environmentally
已开发出一种高效,合适且高产的方法,用于通过拟五组分,β-酮酸酯,芳族醛和各种胺的组合,使用对磺酸通过假五组分合成不同的稠密官能化哌啶衍生物。杯[ n ]芳烃作为催化剂。反应在回流的甲醇中进行,得到非常好的预期的哌啶收率。原子经济,对环境无害的程序,催化剂的重复使用以及较短的反应时间是该协议的重要特征。
Preparation and physicochemical characterization of carbamazepine (CBMZ): para-sulfonated calix[n]arene inclusion complexes
作者:Jayesh G. Panchal、Ravindra V. Patel、Shobhana K. Menon
DOI:10.1007/s10847-009-9698-3
日期:2010.6
The formation of inclusion complexes with para-sulfonated calix[n]arene (PSC[n]A) was studied for carbamazepine (CBMZ), a poorly water soluble anticonvulsant drug. The effect of PSC[4]A and PSC[6]A on aqueous solubility of carbamazepine was studied extensively. The complete complexation of the drug was achieved after 48 h of shaking with PSC[n]A in water and evaporation of water to get solid complex
Using Calixarenes To Model Polyelectrolyte Surfactant Nucleation Sites
作者:Nuno Basilio、Borja Gómez、Luis Garcia-Rio、Vitor Francisco
DOI:10.1002/chem.201203377
日期:2013.4.2
micellized surfactant are strongly related to that of SC6HM. When there is free SC6HM in solution, the addition of C12TAB mainly results in an increase in the concentration of micellized surfactant, but when all SC6HM has been aggregated, the addition of C12TAB results in a substantial increase in the concentration of free surfactant in solution. When the concentration of free surfactant is equal to
Accidental or intentional drug toxicity in humans and animals is a major concern and the search for detoxificant agents is a challenge. Pyrrolizidine-producing forages are a threat not only to livestock, but also to humans as a consequence of food contamination. Supramolecular systems are promising as detoxificant agents by decreasing the bioavailability of toxic compounds in biological environment. Cyclodextrin and calix[n]arenes are well known hosts for a variety of molecules and/or ions. Surprisingly, only few studies describe the potential of calix[n]arenes as host for toxic molecules. This study focused on the use of NMR techniques as tools for the investigation of the interactions between p-sulfonic acid calix[6]arene and retronecine, a toxic pyrrolizidine alkaloid.