Relevant bibliographies by topics / Green chemistry, water, condesation reaction Knoevenagel

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Academic literature on the topic 'Green chemistry, water, condesation reaction Knoevenagel'

Author: Grafiati
Published: 24 April 2022
Last updated: 30 July 2025

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Journal articles on the topic "Green chemistry, water, condesation reaction Knoevenagel"

1

Zhang, Yanmei, Xiang Zhang, Rixia Bai, Xiyan Hou, and Jun Li. "Interface-Active Metal Organic Frameworks for Knoevenagel Condensations in Water." Catalysts 8, no. 8 (2018): 315. http://dx.doi.org/10.3390/catal8080315.

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It is desirable but challenging to locate solid catalysts at the oil-water interface to stabilize “Pickering emulsions”, which is one of the promising ways to develop efficient green chemical processes. Herein, water-stable metal organic framework ZIF-8 without any chemical modification was demonstrated to be an interface-active catalyst for Knoevenagel condensation in a biphasic system. Pickering emulsion formed under the reaction conditions due to its amphiphilic property, which was beneficial to the mass transfer and led to high catalytic performance. Moreover, it can be repeatedly applied
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2

Neves, Fernando B., Lucas L. Zanin, Rayanne R. Pereira, et al. "Chitin and Silk Fibroin Biopolymers Modified by Oxone: Efficient Heterogeneous Catalysts for Knoevenagel Reaction." Catalysts 12, no. 8 (2022): 904. http://dx.doi.org/10.3390/catal12080904.

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New materials from silk fibroin (FS-Ox) and chitin (CT-Ox) functionalized with Oxone® salt were developed for application in the synthesis of Knoevenagel adducts. The experiments were performed using benzaldehyde derivatives, malononitrile, and a mixture of water and ethanol as green solvents. The efficiency of conventional and microwave irradiation as heating sources for this reaction was also investigated. When the reactions were performed for 60 min under optimized conditions with conventional heating, twelve Knoevenagel adducts 2a–l were obtained, with good yields for both catalysts (CT-Ox
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3

Ghogare, Ramesh S., Kalpana Patankar-Jain, and Sana Amir Hamzah Momin. "A simple and efficient protocol for the synthesis of 3,4-disubstituted isoxazole-5(4H)-ones catalyzed by succinic acid using water as green reaction medium." Letters in Organic Chemistry 17 (July 21, 2020). http://dx.doi.org/10.2174/1570178617999200721011300.

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: A simple and efficient protocol has been established to the synthesis of 3,4-disubstituted isoxazol-5(4H)-ones via Knoevenagel condensation reaction. In this synthesis, succinic acid was used as inexpensive catalyst and water as green reaction medium. This method is useful for preparation of variety derivatives of 3,4-disubstituted isoxazol-5(4H)-ones in excellent yields.
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4

Yahyazadehfar, Mahdieh, Sayed Ali Ahmadi, Enayatollah Sheikhhosseini, and Dadkhoda Ghazanfari. "Bentonite Catalyzed an Efficient and Green Synthesis of Arylidene Meldrum's Acid Derivatives in Aqueous Media." Letters in Organic Chemistry 17 (August 7, 2020). http://dx.doi.org/10.2174/1570178617999200807155325.

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: In the present paper, a simple, highly efficient, and environmentally friendly protocol was proposed for the Knoevenagel condensation reaction of aromatic aldehydes using Meldrum’s acid (2,2-dimethyl-4,6-dioxo-1,3-dioxane) with bentonite as an available non-toxic mineral catalyst exposed to aqueous media under green conditions. Together with the substitution protocol of electron-donating or -withdrawing groups, all reactions were finalized from 5 to 120 min in water at 90°C. With regard to such reactions, purification of columns on products was not a requirement. Considering the environmenta
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5

Jyoti, Nirmal, Ashok K. Raigar, Kamlesh Saini, Manju *, and Anjali Guleria. "Exploring the Catalytic Potential of Bioinspired Taurine‐Functionalized Carbon Quantum Dots as Bifunctional Catalysts for Diverse Sustainable Organic Transformations in Water." Chemistry – A European Journal, December 23, 2024. https://doi.org/10.1002/chem.202404060.

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Taurine‐functionalized Carbon Quantum Dots (Tau‐CQDs) were synthesized and evaluated for their catalytic potential under metal‐, acid‐, and base‐free sustainable conditions, using water as a solvent for various organic transformations, including Knoevenagel condensation, the Biginelli reaction, and the Knoevenagel‐Michael cascade. These bioinspired N, S‐doped CQDs exhibit bifunctionality, acting as hydrogen bond donors and acceptors for C–C, C–N, and C–O bond formation. Comprehensive characterization of the catalyst was performed using HRTEM, PXRD, XPS, FTIR, AFM, Zeta potential, UV‐Vis, and p
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6

Gilanizadeh, Masumeh, and Behzad Zeynizadeh. "Synthesis of quaternary metal oxides immobilized on APTMS-coated magnetite: an efficient and reusable nanocatalyst for Knoevenagel condensation under green conditions." Canadian Journal of Chemistry, January 22, 2021, 1–9. http://dx.doi.org/10.1139/cjc-2020-0421.

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A simple, green, and highly efficient procedure has been developed for Knoevenagel condensation of malononitrile and aromatic aldehydes to the corresponding benzylidenemalononitriles in the presence of Fe3O4@APTMS@Zr–Sb–Ni–Zn nanoparticles (NPs) as a durable nanocatalyst. The heterogeneous nanocomposite was prepared by immobilization of Zr–Sb–Ni–Zn mixed metal oxides on APTMS-coated magnetite. The synthesized catalyst was characterized using Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD), v
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7

Kamanna, Kantharaju, and Krishnappa B. Badiger. "Microwave-Accelerated Eco-friendly Performance of the Knoevenagel Condensation Reaction with Various Active Methylene Derivatives-Evaluation of Electrochemical Properties." Current Organocatalysis 10 (February 28, 2023). http://dx.doi.org/10.2174/2213337210666230228103824.

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Background: The present work describes sustainable Knoevenagel condensation reaction of aryl/ heterocyclic aldehyde with various active methylene derivatives such as malononitrile, dimedone, ethyl cyanoacetate, ethyl acetoacetate, barbituric acid, and thiobarbituric acid is reported. The protocol was developed using water extract of mango peel ash (WEMPA), an agro-waste that emerged as a greener solvent media and in combination with microwave irradiation gave high-yield product isolation. The method noticed added advantages for the reaction faster reaction rate, inexpensive extract media, simp
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8

Badiger, Krishnappa B., Santosh Y. Khatavi, Prashant B. Hiremath, and Kantharaju Kamanna. "Agro-waste sourced catalyst as an eco-friendly and sustainable approach for Knoevenagel condensation reaction." Current Organocatalysis 09 (December 22, 2021). http://dx.doi.org/10.2174/2213337209666211222145453.

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Background: The present work describes an eco-friendly and sustainable approach for the Knoevenagel condensation of an aromatic aldehyde with ethyl cyanoacetate, and salicylaldehyde with Meldrum acid for the synthesis of ethyl benzylidenecyanoacetate and 3-carboxy coumarin (2-oxo-2H-1-benzopyran) derivatives, respectively. The reaction performed under greener catalytic media Water Extract of Watermelon Fruit Peel Ash (WEWFPA) is an eco-friendly protocol derived from the agro-waste feedstock. Various protocols have been reported for the synthesis of Knoevenagel condensation reaction using a haz
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