نتایج جستجو برای: knoevenagel

تعداد نتایج: 502  

Journal: :Chemical communications 2016
Christopher S Hinde William R Webb Benny K J Chew Hui Ru Tan Wen-Hua Zhang T S Andy Hor Robert Raja

Colloidal deposition of gold nanoparticles (Au NPs) onto NH2-UiO-66 nanocrystals has been demonstrated with the resulting hybrid catalyst proving robust and versatile for one-pot, heterogeneous conversions involving the selective oxidation of primary alcohols in tandem with Knoevenagel condensation reactions. Within these systems, structure-property correlations have been established to confirm...

Journal: :Dalton Transactions 2021

Correction for ‘A review of the recent progress on heterogeneous catalysts Knoevenagel condensation’ by Jimmy Nelson Appaturi et al., Dalton Trans., 2021, 50, 4445–4469, DOI: 10.1039/d1dt00456e.

Journal: :Chemical communications 2005
Goverdhan Mehta Kotapalli Pallavi Jayant D Umarye

A total synthesis of the structure corresponding to the novel tricyclic diterpene guanacastepene C has been realized in which a Knoevenagel cyclization serves as a key step to annulate the six-membered C-ring on a stereochemically secured bicyclic hydroazulene precursor.

Journal: :Organic & biomolecular chemistry 2012
Jesse B Morin Katherine L Adams Jason K Sello

We report a concise synthesis of A-factor, the prototypical γ-butyrolactone signalling compound of Streptomyces bacteria. In analogy to enzymatic reactions in A-factor biosynthesis, our synthesis features a tandem esterification-Knoevenagel condensation yielding a 2-acyl butenolide and a surprising, chemoselective conjugate reduction of this α,β-unsaturated carbonyl compound using sodium cyanob...

Journal: :Organic & biomolecular chemistry 2015
Yuvaraj Dommaraju Shruti Bora Dipak Prajapati

A concise and efficient approach to the synthesis of structurally diverse 6,8a-dihydropyrido[2,3-d]pyrimidine derivatives has been accomplished by a three-component reaction involving sulfonyl acetonitrile, an aromatic aldehyde, and 6-aminouracil. The method involves the domino Knoevenagel condensation/Michael addition/cyclization cascade in the presence of triethylamine in refluxing ethanol.

Journal: :iranian journal of catalysis 2011
roozbeh javad kalbasi zohreh s. shahzeidi farzad zamani

a simple and green synthetic strategy to prepare bao/tio2-zro2 as a solid base catalyst was reported. these materials with various amounts of bao were prepared by the adsorption method. the physical and chemical properties of bao/tio2-zro2 were investigated by x-ray diffraction, x-ray fluorescence, specific surface area and bjh pore size distribution, ft-ir spectroscopy, scanning electron micro...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2001
ali khalafi nezhad aboulghasem hashemi

efficient knoevenagel condensation of barbituric acid with different aromatic aldehydes on basic alumina was performed in a conventional microwave over in the absence of solvent.

2011
Chen Zhuo Dong Xian Wu Jian-wei Xie Hui

The Knoevenagel condensation reaction of aldehydes with malononitrile was described in this study, which was catalyzed by an efficient and recyclable ionic liquid-supported proline. The method represented an attractive alternative to the classical synthesis strategies and exhibited the advantage of performing homogeneous chemistry on a large scale additionally avoided large excesses of reagents...

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