Results 131 to 140 of about 3,954 (184)

Advantages of Nanocatalysts on Knoevenagel Condensation

2023
Nanocatalysts revolutionize organic chemistry for the conversion of various organic reactions to obtain a high yield, low hazard and stability. It plays an important role in the transformation of organic reactions due to its high surface area, small size, and low reaction time.
Mithun Kumar Ghosh, Tanmay Kumar Ghorai
openaire   +1 more source

Hydroquinone and benzoquinone-catalyzed aqueous Knoevenagel condensation

Organic & Biomolecular Chemistry, 2020
Aqueous Knoevenagel condensation of various aldehydes with malononitrile could efficiently proceed using hydroquinone and benzoquinone as mixed catalysts.
Ryoya Takakura, Kaho Koyama, Marina Kuwata, Tsuyoshi Yamada, Hironao Sajiki, Yoshinari Sawama   +5 more
openaire   +2 more sources

The knoevenagel condensation of ethyl acylpyruvates

Journal of Heterocyclic Chemistry, 1978
AbstractExtensive studies of the Knoevenagel condensation of aromatic aldehydes and active methyl‐lene compounds have been reported (2). In 1894, Knoevenagel reported (3) the reaction of benz‐aldehyde with ethyl benzoylpyruvate in the presence of piperidine to give ehtyl benzyl‐(bis‐benzoyl)pyruvate, m.p. 162°, but no yield of the product was reported.
Takushi Kurihara, Yasuhiko Sakamoto, Toshio Kobayashi, Masanobu Mori   +3 more
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The Knoevenagel condensation at room temperature

Green Chemistry, 2008
The Knoevenagel condensation of malononitrile with various arylaldehydes was studied as an uncatalyzed reaction at ambient temperature. This study was prompted after discovering that a reaction mixture left standing for extended times after mechanochemical treatment would continue to react to significantly higher yields. We report that a mixture (solid/
Ronald Trotzki, Markus M. Hoffmann, Bernd Ondruschka   +2 more
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ChemInform Abstract: The Knoevenagel Condensation in Water

ChemInform, 2012
AbstractReview: 71 refs.
Franca Bigi, Carla Quarantelli
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Leucoemeraldine-Base-Catalyzed Knoevenagel Condensation

Synthetic Communications, 2009
A facile method for Knoevenagel condensation has been developed by using Leucoemeraldine base as catalyst to give substituted alkenes in excellent yields. The recycling of the solid catalyst was investigated.
Ai-Qin Zhang, Ning Zhang, Sanguo Hong, Ming Zhang   +3 more
openaire   +1 more source

‘On water’ Knoevenagel condensation of isatins with malononitrile

Mendeleev Communications, 2011
Grinding of isatins with malononitrile in the presence of 1–5 equiv. of water for 15 min at room temperature affords the corresponding (2-oxo-1,2-dihydro-3H-indol-3-ylidene)malononitriles, the Knoevenagel condensation products, in 89–99% yields.
Dmitry V. Demchuk, Michail N. Elinson, Gennady I. Nikishin   +2 more
openaire   +1 more source

Knoevenagel Condensation of Acetonedicarboxylates with Aldehydes

Journal of Molecular Structure, 2023
Meng-Yang Chang, Chi-Ruei Guo, Chin-Huei Ho   +2 more
openaire   +1 more source

Synthesis of Acrylamides via the Doebner–Knoevenagel Condensation

The Journal of Organic Chemistry, 2019
A selective synthesis of acrylamides had been developed using the Doebner-Knoevenagel condensation. The reaction occurs under mild conditions at ambient temperatures, tolerates a wide array of functional groups, and affords the E-isomer with high selectivity.
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Knoevenagel Condensation Catalysed by New Montmorillonitesilylpropylethylenediamine

Synthetic Communications, 1991
Abstract Facile knoevenagel condensations catalysed by new montmorillonitesilylpropylethylenediamine is reported.
Y. V. Subba Rao, B. M. Choudary
openaire   +1 more source