The Experts below are selected from a list of 8754 Experts worldwide ranked by ideXlab platform
Yong Sheng Chng - One of the best experts on this subject based on the ideXlab platform.
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Fluorous Bispidine: A Bifunctional Reagent for Copper‐Catalyzed Oxidation and Knoevenagel Condensation Reactions in Water.
ChemInform, 2016Co-Authors: Yong Sheng ChngAbstract:Fluorous bispidines are prepared and used as ligands and proton sponges in aerobic oxidation, Knoevenagel Condensation, and tandem oxidation/Knoevenagel Condensation.
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fluorous bispidine a bifunctional reagent for copper catalyzed oxidation and Knoevenagel Condensation reactions in water
ChemInform, 2016Co-Authors: Yong Sheng ChngAbstract:Fluorous bispidines are prepared and used as ligands and proton sponges in aerobic oxidation, Knoevenagel Condensation, and tandem oxidation/Knoevenagel Condensation.
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fluorous bispidine a bifunctional reagent for copper catalyzed oxidation and Knoevenagel Condensation reactions in water
RSC Advances, 2015Co-Authors: Yong Sheng ChngAbstract:Fluorous bispidine-type ligands have been developed to facilitate its recovery and reusability and to demonstrate its bifunctional property as a ligand and base in copper-catalyzed aerobic oxidation, the Knoevenagel Condensation and tandem oxidation/Knoevenagel Condensation in water under mild conditions. Application of the fluorous ligand was also extended to the surfactant-free copper-catalyzed allylic and benzylic sp3 C–H oxidation reaction in water. The fluorous ligands could be recovered using F-SPE with recovery ranging from 91–97% and could be reused five times with little loss of activity.
King Lun Yeung - One of the best experts on this subject based on the ideXlab platform.
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an investigation of Knoevenagel Condensation reaction in microreactors using a new zeolite catalyst
Applied Catalysis A-general, 2004Co-Authors: Xiongfu Zhang, R M Martinaranda, King Lun YeungAbstract:Abstract New basic zeolite catalysts obtained by grafting amino groups onto NaX and CsNaX zeolites exhibit excellent catalytic activities for Knoevenagel Condensation reaction between benzaldehyde and ethyl cyanoacetate (ECA), ethyl acetoacetate (EAA) and diethyl malonate (DEM). The CsNaX-NH 2 catalyst also displays higher conversion compared to aminopropylated MCM-41. Knoevenagel Condensation reaction in a CsNaX zeolite microreactor performed better than the traditional packed bed reactor (PBR) with an order of magnitude higher productivity (i.e. moles ethyl 2-cyano-3 phenylacrylate produced per hour for each gram catalyst). A nearly fourfold increase in reaction conversion was obtained for the microreactor when CsNaX-NH 2 catalyst was used. A membrane microreactor was obtained by incorporating a water-selective, NaA membrane to the multi-channel microreactor. The selective removal of water byproduct during the reaction led to a 25% improvement in reaction conversion for both catalysts.
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Knoevenagel Condensation reaction in a membrane microreactor
Chemical Communications, 2003Co-Authors: R M Martinaranda, King Lun YeungAbstract:A multi-channel membrane microreactor was fabricated and tested for Knoevenagel Condensation of benzaldehyde and ethyl cyanoacetate using Cs-exchanged faujasite NaX as the catalyst; the membrane microreactor achieves supra-eqiulibrium conversion at higher product purity.
Ramrao A Mane - One of the best experts on this subject based on the ideXlab platform.
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synthesis of 5 arylidene 2 4 thiazolidinediones by Knoevenagel Condensation catalyzed by baker s yeast
ChemInform, 2011Co-Authors: Umesh R Pratap, Dhanaji V Jawale, Rahul A Waghmare, Dinesh L Lingampalle, Ramrao A ManeAbstract:Baker′s yeast offers an eco-friendly protocol for the Knoevenagel Condensation of aromatic aldehydes with active methylene compounds.
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synthesis of 5 arylidene 2 4 thiazolidinediones by Knoevenagel Condensation catalyzed by baker s yeast
New Journal of Chemistry, 2011Co-Authors: Umesh R Pratap, Dhanaji V Jawale, Rahul A Waghmare, Dinesh L Lingampalle, Ramrao A ManeAbstract:An ecofriendly baker's yeast catalyzed Knoevenagel Condensation of aromatic aldehydes and active methylene compounds has been performed. The developed protocol has been found to be applicable for obtaining 5-arylidene-2,4-thiazolidinediones, the precursors of hypoglycemic agents.
Sangeon Park - One of the best experts on this subject based on the ideXlab platform.
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mesoporous carbon nitride as a metal free base catalyst in the microwave assisted Knoevenagel Condensation of ethylcyanoacetate with aromatic aldehydes
Catalysis Today, 2012Co-Authors: Mohd Bismillah Ansari, Mst Nargis Parvin, Sangeon ParkAbstract:Abstract High nitrogen containing mesoporous carbon nitride (MCN) was synthesized and investigated as a metal-free base catalyst for the Knoevenagel Condensation of ethylcyanoacetate with aromatic aldehydes. The catalyst was found to be efficient for the Knoevenagel Condensation performed under microwave irradiation. The yields obtained were in the range 75–95% within short time of 12 min. The mesoporous carbon nitride was readily recovered and reused up to 5 cycles without losses in the catalytic activities.
Wenqin Zhang - One of the best experts on this subject based on the ideXlab platform.
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highly efficient Knoevenagel Condensation reactions catalyzed by a proline functionalized polyacrylonitrile fiber
Chinese Chemical Letters, 2013Co-Authors: Guowei Li, Jia Xiao, Wenqin ZhangAbstract:Abstract A new proline-functionalized fiber catalyst was employed for the first time to catalyze the Knoevenagel Condensation reactions between aromatic aldehydes and ethyl cyanoacetate or malononitrile. This fiber catalyst exhibits a high efficiency (0.5–2 mol% of catalyst with yields of 90%–99%) and excellent reusability (up to 20 times) without the need for additional treatments.
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Knoevenagel Condensation catalyzed by a tertiary amine functionalized polyacrylonitrile fiber
Green Chemistry, 2011Co-Authors: Guowei Li, Jia Xiao, Wenqin ZhangAbstract:A new fiber catalyst for Knoevenagel Condensation has been prepared by aminating a commercially available polyacrylonitrile fiber with N,N-dimethyl-1,3-propanediamine. The fiber catalyst was characterized by elemental analysis, X-ray powder diffraction spectra (XRD), scanning electron microscopy (SEM) and Fourier-transfer infrared spectroscopy (FTIR). The Knoevenagel Condensation proceeded smoothly in the presence of the fiber catalyst and the products were obtained in excellent yields. This catalyst is applicable to a wide range of aromatic aldehydes. Moreover, the reaction can be easily carried out in different solvents of varying polarities. The newly developed fiber catalyst was also found to exhibit excellent recyclability and reusability (up to 10 times) without any additional treatment.
