2826-32-6Relevant articles and documents
Successive oxidation-condensation reactions using a multifunctional gold-supported nanocomposite (Au/MgCe-HDO)
Chandra, Ramesh,Kumar, Loveneesh,Kumar, Rupesh,Sehrawat, Hitesh,Tomar, Ravi,Verma, Nishant
, p. 3472 - 3481 (2022/02/21)
The application of gold-supported nanocomposites is useful in clinical diagnostics because of their ability to provide bio-compatible and sensitive detection systems. A gold-supported magnesium hydroxide and cerium oxide nanocomposite framework (Au/MgCe-HDO) was synthesized and characterized via XRD, XPS, SEM, DLS, TEM, and TGA techniques. The nanocomposite was used as a selective catalyst for the aerobic oxidation of alcohols under mild reaction conditions followed by successive condensation reactions, like Knoevenagel and Claisen-Schmidt condensation. Substituted benzyl alcohols were converted into the corresponding carbonyl compounds in the presence of the Au/MgCe-HDO nanocomposite with O2 gas and toluene as a solvent. We observed that, upon the addition of malononitrile/ethyl cyanoacetate/acetophenone to the catalyst in the aerobic oxidation reaction, the reaction proceeds to produce the corresponding desired condensation product with up to 95% yield.
Trifunctional covalent triazine and carbonyl based polymer as a catalyst for one-pot multistep organic transformation
Ravi, Seenu,Raza, A. Ahmed,Sheriff, A. K. Ibrahim,Tajudeen, S. Syed
, (2021/08/24)
Trifunctional covalent triazine and carbonyl based polymer with acid-base and metal active sites (CTCP-SO3H-EDA/Pd) was synthesized by a multistep friedel-crafts reaction, post-synthetic sulfonation, schiff base condensation and metal nanoparticle incorporation. CTCP-SO3H-EDA/Pd was characterized by FT-IR, N2 sorption-desorption isotherm, elemental analysis, ICP-OES, TEM-EDS and TEM. CTCP-SO3H-EDA/Pd was evaluated as a heterogeneous catalyst for the conversion of 1-(dimethoxymethyl)-3-nitrobenzene into 2-(3-aminobenzylidene)malononitrile via a three step deacetylation-Knoevenagel and transfer hydrogenation reaction in one domino process. The cooperation of SO3H acidic sites, EDA and uniformly distributed Pd nanoparticles greatly facilitated the one-pot reaction and produced good yield of the desired product with high selectivity. The catalyst was recovered by simple centrifugation and could be reused for five runs with minor loss of catalytic activity and selectivity. A plausible mechanism for deacetylation, C[sbnd]C bond formation and subsequent chemoselective reduction of nitro functionality over CTCP-SO3H-EDA/Pd was also proposed.
Polyionic liquid decorated chitosan beads as versatile metal-free catalysts for catalyzing chemical reactions in aqueous media
Koohestani, Fatemeh,Sadjadi, Samahe
, (2021/04/19)
A new strategy is presented for enhancing the catalytic activity of cross-linked chitosan beads. More precisely, chitosan beads were cross linked with glutaraldehyde and then, vinyl functionalized. In the next step, the vinyl-functionalized beads were pol
Biguanide-functionalized hierarchical porous covalent organic frameworks for efficient catalysis of condensation reactions
Feng, Huiru,Gong, Kai,Li, Cunhao,Li, Haoran,Wang, Yunyun,Zhang, Daquan,Zhang, Huimin
, (2021/07/21)
Covalent organic frameworks (COFs) can be rationally designed with desired physicochemical properties for a far-ranging application in catalytic systems. Herein, a biguanide-functionalized covalent organic framework was designed and prepared via N-alkylat
Design and Development of Amine Functionalized Mesoporous Cubic Silica Particles: A Recyclable Catalyst for Knoevenagel Condensation
Gupta, Padmini,Kumar, Lalita S.,Kumar, Yogesh,Shabir, Javaid
, (2021/07/28)
Abstract: The amine functionalized cubic mesoporous silica nanoparticles (cSiO2-NH2) were successfully synthesized through biphasic stratification approach. The synthesized material was characterised by various spectroscopic and phys
Introduction of succinimide as a green and sustainable organo-catalyst for the synthesis of arylidene malononitrile and tetrahydrobenzo[b] pyran derivatives
Hassanzadeh, Fariba,Shirini, Farhad,Mamaghani, Manouchehr,Daneshvar, Nader
, p. 155 - 163 (2021/03/23)
Aim and Objective: In this work, we tried to introduce a non-toxic and stable organic compound named succinimide as a green and efficient organo-catalyst for the promotion of the synthesis of arylidene malononitrile and tetrahydrobenzo[b]pyran derivatives
Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
Darvishzad, Shila,Daneshvar, Nader,Shirini, Farhad,Tajik, Hassan
, p. 2973 - 2984 (2021/04/19)
A 2,2′-Bipyridine-based ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acid derivatives via Knoevenagel condensation reaction in water. Some of the advantages of this method are the utilization of an easy preparable, cost-effective and eco-friendly organic salt as a catalyst within high rates and yields of the reactions, simple and quick work-up and acceptable reusability of the catalyst.
Application of structurally enhanced magnetite cored polyamidoamine dendrimer for knoevenagel condensation
Hajizadeh, Fatemeh,Maleki, Behrooz,Zonoz, Farrokhzad Mohammadi,Amiri, Amirhassan
, p. 793 - 804 (2020/10/02)
In this paper, the synthesis of magnetic cored amino group terminated dendrimer (Fe3O4@SiO2@PAMAM-G2) through covalent bonding was described. This catalyst was characterized by FT-IR, XRD, FE-SEM, TEM, and TGA d
Synthesis of lithium/cesium-Zagronas from zagrosian natural asphalt and study of their activity as novel, green, heterogeneous and homogeneous nanocatalysts in the Claisen–Schmidt and Knoevenagel condensations
Soleiman-Beigi, Mohammad,Ghalavand, Saba,Venovel, Hadis Gholami,Kohzadi, Homa
, p. 3267 - 3279 (2021/06/17)
A novel, heterogeneous and homogeneous basic nanocatalysts were synthesized by grafting of lithium and cesium on zagrosian natural asphalt sulfonate (Li/Cs-Zagronas). The activity of these catalysts was examined in the Claisen–Schmidt and Knoevenagel condensations under mild reaction conditions. Li/Cs-Zagronas were characterized by FT-IR spectroscopy, scanning electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, inductively coupled plasma and thermogravimetric analysis techniques. These nanocatalysts were removed by simple filtration and reused several times without any deterioration of activity.