Creation of a stable and well-defined active center on a solid surface is a promising protocol for designing more efficient hybrid-catalysts that bridge the gapbetweenhomogeneous and heterogeneouscatalysis. Treatment of a hydroxyapatite-bound Ru complex (RuHAP) with an aqueous solution of AgX (X = SbF6-, TfO-) afforded a new type of cationic Ru phosphate complex, having potentially vacant coordination
Ionic Liquid as Catalyst and Reaction Medium – A Simple, Efficient and Green Procedure for Knoevenagel Condensation of Aliphatic and Aromatic Carbonyl Compounds Using a Task-Specific Basic Ionic Liquid
作者:Brindaban C. Ranu、Ranjan Jana
DOI:10.1002/ejoc.200600335
日期:2006.8
The basicionicliquid 1-butyl-3-methylimidazolium hydroxide, [bmIm]OH, efficiently catalyzes Knoevenagel condensation without requirement of any organic solvent. A wide range of aliphatic and aromatic aldehydes and ketones easily undergo condensations with diethyl malonate, malononitrile, ethyl cyanoacetate, malonic acid and ethyl acetoacetate. The reactions proceed at room temperature and are very
High Surface Area MgO as a Highly Effective Heterogeneous Base Catalyst for Michael Addition and Knoevenagel Condensation Reactions
作者:Graham J. Hutchings、Chunli Xu、Jonathan K. Bartley、Dan I. Enache、David W. Knight
DOI:10.1055/s-2005-918467
日期:——
Magnesium oxide (MgO), obtained using a novel but simple procedure, was systematically investigated as a heterogeneous base catalyst for reactions taking place in the liquid phase, specifically the Michael addition and the Knoevenagel condensation. The activity of MgO was studied in detail, together with the effects of solvent and substrate on the catalytic activity for each type of reaction. A key finding is that the formation of enols affected the activity of MgO. The experimental results show that the activity of MgO did not change when it was reused and it is an excellent heterogeneous catalyst for the reactions studied.
YTTERBIUM PERFLUOROOCTANESULFONATE-CATALYZED KNOEVENAGEL CONDENSATION IN A FLUOROTJS BIPHASIC SYSTEM
作者:Wen-Bin Yi、Ya-Qing Yin、Chun Cai
DOI:10.1080/00304940709458582
日期:2007.2
handling, robustness for recycling and high solubility in fluorous solvent.8-'0 A catalytic amount of RE(OPf), successfully promotes several synthetically useful reactions such as Friedel-Crafts acylation l 1 and alkylation," aldol condensation,6 nitration," Mannich reaction I 3 and Diels-Alder reactions.8 The catalyst immobilized in the fluorous phase was recovered by simple phase separation and reused
A Straightforward Method for the Synthesis of Functionalized Trisubstituted Alkenes through Na<sub>2</sub>S/Al<sub>2</sub>O<sub>3</sub>Catalyzed Knoevenagel Condensation
作者:Majid M. Heravi、Khadijeh Bakhtiari、Shima Taheri、Hossein A. Oskooie
DOI:10.1002/jccs.200700219
日期:2007.12
Na 2 S/Al 2 O 3 catalyzed the Knoevenagelcondensation between an aldehyde and an active methylene compound to yield various trisubstitutedalkenes.
Na 2 S/Al 2 O 3 催化醛与活性亚甲基化合物之间的Knoevenagel缩合反应生成各种三取代烯烃。