- Successive oxidation-condensation reactions using a multifunctional gold-supported nanocomposite (Au/MgCe-HDO)
-
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.
- Chandra, Ramesh,Kumar, Loveneesh,Kumar, Rupesh,Sehrawat, Hitesh,Tomar, Ravi,Verma, Nishant
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p. 3472 - 3481
(2022/02/21)
-
- Trifunctional covalent triazine and carbonyl based polymer as a catalyst for one-pot multistep organic transformation
-
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.
- Ravi, Seenu,Raza, A. Ahmed,Sheriff, A. K. Ibrahim,Tajudeen, S. Syed
-
-
- Polyionic liquid decorated chitosan beads as versatile metal-free catalysts for catalyzing chemical reactions in aqueous media
-
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
- Koohestani, Fatemeh,Sadjadi, Samahe
-
-
- Biguanide-functionalized hierarchical porous covalent organic frameworks for efficient catalysis of condensation reactions
-
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
- Feng, Huiru,Gong, Kai,Li, Cunhao,Li, Haoran,Wang, Yunyun,Zhang, Daquan,Zhang, Huimin
-
-
- Design and Development of Amine Functionalized Mesoporous Cubic Silica Particles: A Recyclable Catalyst for Knoevenagel Condensation
-
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
- Gupta, Padmini,Kumar, Lalita S.,Kumar, Yogesh,Shabir, Javaid
-
-
- Introduction of succinimide as a green and sustainable organo-catalyst for the synthesis of arylidene malononitrile and tetrahydrobenzo[b] pyran derivatives
-
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
- Hassanzadeh, Fariba,Shirini, Farhad,Mamaghani, Manouchehr,Daneshvar, Nader
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p. 155 - 163
(2021/03/23)
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- Knoevenagel condensation in aqueous media promoted by 2,2′-bipyridinium dihydrogen phosphate as a green efficient catalyst
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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.
- Darvishzad, Shila,Daneshvar, Nader,Shirini, Farhad,Tajik, Hassan
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p. 2973 - 2984
(2021/04/19)
-
- Application of structurally enhanced magnetite cored polyamidoamine dendrimer for knoevenagel condensation
-
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
- Hajizadeh, Fatemeh,Maleki, Behrooz,Zonoz, Farrokhzad Mohammadi,Amiri, Amirhassan
-
p. 793 - 804
(2020/10/02)
-
- 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
-
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.
- Soleiman-Beigi, Mohammad,Ghalavand, Saba,Venovel, Hadis Gholami,Kohzadi, Homa
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p. 3267 - 3279
(2021/06/17)
-
- Introduction of bis-imidazolium dihydrogen phosphate as a new green acidic ionic liquid catalyst in the synthesis of arylidene malononitrile, ethyl (E)-3-(aryl)-2-cyanoacrylate and tetrahydrobenzo[b]pyran derivatives
-
In this work, [H2-Bisim][H2PO4]2 as a novel bis-imidazole-based acidic ionic liquid has been synthesized and characterized with a variety of techniques including FT-IR, 1H, 13C, 31/su
- Rahmatizadeh-Pashaki, Zahra,Daneshvar, Nader,Shirini, Farhad
-
p. 2135 - 2149
(2021/02/01)
-
- Ammonium chloride catalyzed Knoevenagel condensation in PEG-400 as ecofriendly solvent
-
A simple and selective green methodology has been successfully developed for Knoevenagel condensation in polyethylene glycol-400 using 10 mol % ammonium chloride as catalyst. The method is applicable to a wide range of aromatic, heteroaromatic and α,β-unsaturated aldehydes. The reactions have been found to be clean and free from the formation of the Michael adduct.
- Waghmare, Smita R.
-
p. 849 - 855
(2021/09/28)
-
- A 2D-layered Cd(II) MOF as an efficient heterogeneous catalyst for the Knoevenagel reaction
-
A Cd(II) coordination polymer based on a polytopic compartmental ligand was synthesized, and used as an efficient heterogeneous catalyst for the Knoevenagel reaction between benzaldehyde and malononitrile under mild reaction conditions. The solid catalyst
- Tom, Lincy,Kurup
-
-
- Highly Active Bisamino Functionalized Zr(IV)-UiO-67 Metal-Organic Framework for Cascade Catalysis
-
This work reports the synthesis and characterization of Zr(IV)-based UiO-67-(NH2)2 (called 1) metal-organic framework. Activated 1 (named 1') was shown to be an efficient tandem catalyst in the conversion of benzaldehydedimethyl acet
- Das, Aniruddha,Anbu, Nagaraj,Mostakim,Dhakshinamoorthy, Amarajothi,Biswas, Shyam
-
supporting information
p. 2830 - 2834
(2020/07/04)
-
- Acidic polymer containing sulfunic acid and carboxylic acid groups heterogenized with natural clay: A novel metal free and heterogeneous catalyst for acid-catalyzed reactions
-
A novel metal-free solid acid catalyst, PHSA, has been designed and synthesized through facile and environmentally benign procedure via using halloysite nanoclay as a natural and biocompatible support. The synthetic protocol included co-polymerization of
- Akbari, Maryam,Heravi, Majid M.,Kahangi, Fatemeh Ghoreyshi,Sadjadi, Samahe
-
-
- Introduction of a new bis-derivative of succinimide (Bis-Su) as a sustainable and efficient basic organo-catalyst for the synthesis of arylidene malononitrile and tetrahydrobenzo[b]pyran derivatives under green conditions
-
Organo-catalysts have been under great consideration for many years because of their performance and selectivity in the reactions. In this work, a new bis-succinimide (Bis-Su) compound is prepared, identified and used as a green and efficient basic organo
- Hassanzadeh, Fariba,Daneshvar, Nader,Shirini, Farhad,Mamaghani, Manouchehr
-
p. 4971 - 4984
(2020/09/02)
-
- The Modified Clay as a New and Eco-Friendly Catalyst for the Knoevenagel Reaction
-
Abstract: This work aims the synthesis of substituted alkenes via Knoevenagel condensation using the clay collected from the Agadir region and modified by KF as a heterogeneous catalyst (KF-modified clay). In this context, the influence of various paramet
- Bentahar, S.,Dbik, A.,Khomri, M. El,Lacherai, A.,Messaoudi, N. El,Sabour, A.,Taleb, M. Ait
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p. 1438 - 1444
(2020/10/29)
-
- Magnetic core-shell dendritic mesoporous silica nanospheres anchored with diamine as an efficient and recyclable base catalyst
-
In the present study, diamine-functionalized magnetic core-shell dendritic mesoporous silica nanospheres have been successfully synthesized by an oil-water biphasic stratification-coating strategy. The shape, size and morphology of the synthesized magnetic nanocatalyst could be characterized by various physicochemical techniques such as, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The characteristic information about the successful immobilization of various functionalities on the nanospheres could be obtained with the help of X-ray powder diffraction (XRD) patterns, Fourier transform-infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX) and thermo-gravimetric analysis (TGA). The details about the magnetic behaviour and surface area of the nanocatalyst could be acquired by vibrating sample magnetometry (VSM) and BET surface analysis, respectively. The synthesized diamine-functionalized magnetic nanoparticles were then explored as a highly efficient catalyst for the Knoevenagel condensation and one-pot synthesis of polyhydroquinolines using aromatic/heteroaromatic aldehydes and aliphatic aldehydes with active methylene compounds under very mild conditions. The synthesized magnetic core-shell dendritic mesoporous silica nanospheres had large surface areas. This large surface area and pore volume could facilitate a proper interaction and penetration of the reactant molecules with the basic amine groups present on the dendritic mesoporous silica nanospheres. The supported nanocatalyst revealed no sign of leaching of the amine groups present inside the dendrimers and therefore, could be reused up to nine times without any noteworthy loss in catalytic activity.
- Surabhi,Shabir, Javaid,Gupta, Padmini,Sah, Digvijay,Mozumdar, Subho
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p. 21152 - 21166
(2020/12/31)
-
- Reaction kinetics investigation of Malononitrile with substituted benzaldehydes in aqueous solutions of ethaline as deep eutectic solvent
-
Due to increasing demands for ecofriendly processes within the framework of green chemistry, and having shown substantial properties, especially in terms of toxicity, biodegradability, cost, and ease of preparation under ambient conditions, deep eutectic
- Abbasi, Mostafa,Harifi-Mood, Ali Reza,Lotfi Nosood, Yazdanbakhsh
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p. 513 - 519
(2020/04/28)
-
- Potassium Natural Asphalt Sulfonate (K-NAS): Synthesis and characterization as a new recyclable solid basic nanocatalyst and its application in the formation of carbon–carbon bonds
-
In this research, we synthesized and characterized a new heterogeneous basic nanocatalyst and its catalytic application was studied in the Claisen-Schmidt and Knoevenagel condensations. In order to prepare this nanocatalyst, first, the Iranian natural asphalt was sulfonated with the concentrated sulfuric acid and then, converted to the potassium natural asphalt sulfonate (K-NAS). In order to characterization of the nanocatalyst, used of FT-IR spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), inductively coupled plasma (ICP) and thermogravimetric analysis (TGA) techniques. This new basic heterogeneous nanocatalyst have advantages such as being eco-friendly, huge specific surface area, high reactivity and recyclability.
- Falah, Saeid,Soleiman-Beigi, Mohammad,Kohzadi, Homa
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-
- Introduction of an efficient DABCO-based bis-dicationic ionic salt catalyst for the synthesis of arylidenemalononitrile, pyran and polyhydroquinoline derivatives
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—An affordable DABCO-based bis-dicationic ionic salt ([(DABCO)2C3H5OH]·2Cl) was utilized for the synthesis of arylidenemalononitrile, tetrahydrobenzo[b]pyran, pyrano[2,3-d]-pyrimidinone (thione), dihydropyrano[3,2-c]chrome
- Zabihzadeh, Mehdi,Omidi, Atefeh,Shirini, Farhad,Tajik, Hassan,Langarudi, Mohaddeseh Safarpoor Nikoo
-
-
- Organocatalytic Cascade Knoevenagel–Michael Addition Reactions: Direct Synthesis of Polysubstituted 2-Amino-4H-Chromene Derivatives
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Abstract: In this report, we documented novel strategy for the synthesis of bioactive polysubstituted 2-amino-4H-chromine derivatives under a heterogeneous Al-MCM-41-LDH@APTES (ALAM) catalysis. A synthetic procedure is developed to prepare Al-MCM-41-LDH@APTES (ALAM) heterogeneous basic catalysts. Mesoporous Al-MCM-41 is functionalized by known grafting chemistry via layered double hydroxide (LDH) nanosheets and (3-aminopropyl)triethoxysilane (APTES) moiety as a basic organocatalyst. The resulting catalysts contain amino group functionality on the external surface as well as inside the layers and the basicity can be tuned by the loading of APTES. The samples were fully characterized by 29Si and 13C CP/MAS NMR, infrared absorption spectroscopy, TEM, XPS, EDX, TGA, XRD, CO2-TPD, N2 adsorption isotherms measurements, and they were successfully examined for the cascade type Knoevenagel–Michael addition reactions. The product yields associated with these substrates were optimized, and key reaction parameters affecting the yields were identified. The present catalytic method is simple and robust for diversity oriented synthesis which proceeds good to excellent yields without generating any hazards waste. The broad substrate scope, excellent functional group compatibility makes this protocol highly useful towards synthesis of polysubstituted α-cyanoacrylates, α-cyanoacrylonitriles and 2-amino-4H-chromenes with an electron-donating or electron-withdrawing group. We have also successfully established a flow reaction system, gram-scale synthesis as well as catalyst recyclability up to six catalytic cycles without appreciable loss of its activity. Graphic Abstract: [Figure not available: see fulltext.].
- Jadhav, Sanjay N.,Patil, Seema P.,Sahoo, Dipti Prava,Rath, Dharitri,Parida, Kulamani,Rode, Chandrashekhar V.
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p. 2331 - 2351
(2020/02/25)
-
- Amine-functionalized hollow mesoporous nano-bowl with bulky acid-imprinted free space around base sites and DMF-annealed mesoporous channels as an efficient solid base catalyst
-
Tailoring free spaces around catalytic sites and constructing inter-connected channels between them are highly attractive for achieving easy accessibility of reactants to catalytic sites. In this study, a strategy for constructing free space around base s
- Li, Shan,Ma, Xuebing,Wei, Shuai,Zhang, Jianing,Zhang, Li
-
-
- Cadmium Naphthalenedisulfonate Complex as Heterogeneous Catalyst in the Knoevenagel Condensation
-
The reaction of naphthalene-1,5-disulfonate (1,5-nds), 2,4,5-tris(pyridin-4-yl)imidazole (tpim), and cadmium(II) acetate dihydrate Cd(OAc)2·2H2O afforded a 2D coordination polymer, [Cd(tpim)(1,5-nds)]n (1). Crystal structu
- Deng,Guo,He,Ji
-
p. 117 - 121
(2019/04/13)
-
- Comparison of the efficiency of two imidazole-based dicationic ionic liquids as the catalysts in the synthesis of pyran derivatives and Knoevenagel condensations
-
In the present work, 3,3′-(butane-1,4-diyl)bis(1-methyl-1H-imidazol-3-ium) dichloride ([C4(MIm)2]·2Cl) and 3,3′-(butane-1,4-diyl)bis(1-methyl-1H-imidazol-3-ium) hydrogen sulfate ([C4(MIm)2]·2HSO4) were prepared via adequate, solvent-free methods and characterized using FT-IR, 1H NMR, 13C NMR, and potentiometric titration techniques. These reagents were investigated in the synthesis of 5-arylidene (thio)barbituric acids, 2-arylidene malononitriles, 4H-pyrans, and pyrano[2,3-d] pyrimidineones, and their catalytic activities were compared in the promotion of these reactions. Based on the obtained results, we found that [C4(MIm)2]·2Cl showed more catalytic efficiency where a basic or weak acidic media is needed. In contrast, [C4(MIm)2]·2HSO4 is a powerful catalyst in reactions needing acidic catalysts to enhance the reaction rate. Using these reagents, the products were formed under mild and eco-friendly conditions in excellent yields during short reaction times without needing column chromatography for work-up.
- Sharifi, Zahra,Daneshvar, Nader,Langarudi, Mohaddeseh Safarpoor Nikoo,Shirini, Farhad
-
p. 4941 - 4958
(2019/07/03)
-
- Mechanically fabricated Metal–organic framework/resin composite nanoparticles for efficient basic catalysis
-
Zeolitic imidazolate framework-8 (ZIF-8) was successfully composited with an anionic basic resin 201?×?7 (717-resin) to provide a novel ZIF-8/717-resin composite. Its catalytic activity toward the Knoevenagel condensation reaction was evaluated. Results s
- Zhang, Zhi-Hui,Qian, Bing-Bing,Sheng, Pan-Pan,Yang, Sen,Huang, Xian-Feng,Wang, Jin-Long,Chen, Qun,Wang, Liang,He, Ming-Yang
-
-
- Method used for preparing substituted 1, 3-malononitrile
-
The invention belongs to the field of fine chemical product preparation and medicine intermediate synthesis, and relates to a method used for preparing substituted 1, 3-malononitrile. According to themethod, an aldehyde or a ketone and malononitrile are subjected to condensation reaction to prepare substituted 1, 3-malononitrile, wherein water is taken as a solvent, the aldehyde or the ketone andmalononitrile are subjected to Knoevenagel condensation under catalytic effect of zinc proline so as to obtain the corresponding substituted 1, 3-malononitrile. The method conditions are mild; operation is convenient; water is taken as a reaction solvent, so that the method is friendly to the environment; and the application prospect is promising.
- -
-
Paragraph 0028-0029
(2019/08/07)
-
- New magnetic nanocatalyst containing a bis-dicationic ionic liquid framework for Knoevenagel condensation reaction
-
Bis[(3-aminopropyl)triethoxysilane]dichloride immobilized on magnetic nano-γ-Fe2O3@SiO2 has been prepared. After characterization, the reagent was used for efficient promotion of the Knoevenagel reaction, achieving high re
- Karimi-Chayjani, Reyhaneh,Daneshvar, Nader,Shirini, Farhad,Tajik, Hassan
-
p. 2471 - 2488
(2019/02/24)
-
- Ordered mesoporous Γ-Al2O3 as highly efficient and recyclable catalyst for the Knoevenagel reaction at room temperature
-
Coumarins are important class of organic compounds and intensively used in agricultural and pharmaceutical industries. We have developed a strategy for the synthesis of coumarin derivatives quantitatively via Knoevenagel condensation reaction of an ortho-hydroxyaryl aldehyde and an activated methylene compounds in the presence of ordered mesoporous γ-Al2O3 as a heterogeneous catalyst. The catalyst has been thoroughly characterized through powder X-ray diffraction, N2 sorption analysis, FTIR spectroscopy, TG/DTA, NH3-TPD and CO2-TPD (temperature programmed desorption) analysis. The material possesses periodicity in mesopores and both surface acidic and basic sites having strengths of 1.47 and 1.11 mmol g?1, respectively, which is highly favorable for carrying out the Knoevenagel condensation reaction for the synthesis of a wide range of condensation product (yields ~98%) under very mild conditions. This amphoteric catalyst exhibits good surface Lewis acidity/basicity and high recyclability up to sixth reaction cycles without any significant loss in the product yield.
- Bhanja, Piyali,Kayal, Utpal,Bhaumik, Asim
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p. 220 - 227
(2018/04/05)
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- Fe3O4-Methylene diphenyl diisocyanate-guanidine (Fe3O4–4,4′-MDI-Gn): A novel superparamagnetic powerful basic and recyclable nanocatalyst as an efficient heterogeneous catalyst for the Knoevenagel condensation a
-
In this paper, guanidine groups (Gn) supported on modified magnetic nanoparticles (Fe3O4–4,4′-MDI) were synthesized for the first time. The catalyst synthesized was characterized by various techniques such as SEM (Scanning Electron M
- Maleki, Razieh,Koukabi, Nadiya,Kolvari, Eskandar
-
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- Synthesis and characterization of the immobilized Ni-Zn-Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under
-
Herein, novel magnetic Fe3O4@SiO2@Ni-Zn-Fe layered double hydroxide (LDH) intercalated with water molecules and carbonate anions as interlayer contents was prepared as a new heterogeneous and separable nanocatalyst. The me
- Gilanizadeh, Masumeh,Zeynizadeh, Behzad
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p. 8553 - 8566
(2018/06/08)
-
- Synthesis method of alkenyl dinitrile compounds
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The invention discloses a synthesis method of alkenyl dinitrile compounds. The preparation method comprises the following steps: taking substituted aldehyde and malononitrile as raw materials, takingRu/C as a catalyst, carrying out a reaction at 20-60 DEG
- -
-
Paragraph 0056-0059
(2018/09/08)
-
- Binary copper and iron oxides immobilized on silica-layered magnetite as a new reusable heterogeneous nanostructure catalyst for the Knoevenagel condensation in water
-
Abstract: In this study, a novel heterogeneous and reusable nanostructure catalyst was synthesized through the immobilization of bimetallic Cu–Fe mixed oxides on silica-layered magnetite. The prepared nanomagnetic Fe3O4@SiO2/su
- Gilanizadeh, Masumeh,Zeynizadeh, Behzad
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p. 6053 - 6070
(2018/05/26)
-
- TEDETA@BNPs as a basic and metal free nanocatalyst for Knoevenagel condensation and Hantzsch reaction
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In this work, Boehmite nanoparticles (BNPs) were synthesized in water using commercially available materials and further N,N,N′,N′-tetraethyldiethylentriamin (TEDETA) was supported on the surface of BNPs, and used as organo-basic catalyst in four-componen
- Ghorbani-Choghamarani, Arash,Heidarnezhad, Zahra,Tahmasbi, Bahman,Azadi, Gouhar
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p. 2281 - 2293
(2018/08/28)
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- Functionalization of A3B-type porphyrin with Fe3O4 MNPs. Supramolecular assemblies, gas sensor and catalytic applications
-
The aim of this study was to synthesize different multifunctional materials containing 5-(4-carboxyphenyl)-5,10,15-tris(4-phenoxyphenyl)-porphyrin and iron oxide magnetic nanoparticles (MNPs). Besides, a new type of polymeric material comprising the same
- Mak, Carmen A.,Pericas, Miquel A.,Fagadar-Cosma, Eugenia
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p. 268 - 275
(2017/09/30)
-
- Synthesis and characterization of sulfamic acid supported on Fe3O4 nanoparticles: A green, versatile and magnetically separable acidic catalyst for oxidation reactions and Knoevenagel condensation
-
Sulfamic acid immobilized on diethylenetriamine functionalized Fe3O4 nanoparticles (SA-DETA-Fe3O4) was successfully prepared and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), X-Ray diffraction (XRD) and scanning electron microscopy (SEM). The sulfamic acid was found as a magnetically separable and highly active catalyst for the oxidative coupling thiols, oxidation of sulfides. Furthermore, the SA-DETA-Fe3O4 showed the high catalytic activity in Knoevenagel condensation of aromatic aldehydes with active methylene compounds (malononitrile and ethyl cynoacetate). The nanosolid catalyst could be easily recovered by a simple magnetic separation and reused for many cycles without deterioration in catalytic activity.
- Shiri, Lotfi,Narimani, Hojatollah,Kazemi, Mosstafa
-
-
- Sulfuric acid heterogenized on magnetic Fe3O4 nanoparticles: A new and efficient magnetically reusable catalyst for condensation reactions
-
Immobilized sulfuric acid on magnetic Fe3O4 nanoparticles (Fe3O4 MNPs-OSO3H) as a new solid acid nanocomposite was successfully synthesized and its catalytic activity in a series of condensation reactions was studied. High catalytic activity, simple separation from reaction mixture by an external magnet and good reusability are several eco-friendly advantages of this catalytic system. It is noteworthy that this catalytic system is applicable to a wide range of spectrum of aromatic aldehydes, and the desired products were obtained in good to excellent yields under mild conditions. The use of ecofriendly solvents makes also this synthetic protocol ideal and fascinating from the environmental point of view.
- Shiri, Lotfi,Zarei, Setare,Kazemi, Mosstafa,Sheikh, Davood
-
-
- Phosphorous acid functionalized polyacrylonitrile fibers with a polarity tunable surface micro-environment for one-pot C-C and C-N bond formation reactions
-
The preparation and application of fiber catalysts have attracted much attention. However, research on the effect of the micro-environment of fiber catalysts on the catalytic activities though of special importance is limited. In this work, a novel strategy for the synthesis of phosphoric acid-functionalized polyacrylonitrile fibers with a polarity tunable surface micro-environment by hydrophobic groups for one-pot C-C and C-N bond formation reactions is reported. The special hydrophobic surface micro-environment of the fiber catalysts is proven to promote the catalytic activities impressively in cyclocondensation of β-ketoesters with 2-aminobenzamides, the Knoevenagel condensation as well as the multi-component Biginelli reactions in green solvents. Both the surface synergy of the catalytic sites and hydrophobic auxiliary groups (benzyl or n-butyl) in the surface of fiber catalysts and interface acceleration in reaction medium play an important role in the highly efficient promotion of catalytic activity. Thereby a surface synergistic mechanism is proposed to explain the micro-environment effect. In addition, the fiber catalysts could be simply separated from the reaction system using tweezers and directly used in the next cycle without further treatment. Importantly, even after 10 reaction cycles in water or ethanol, there is no significant loss in their catalytic activity. The results indicate that the phosphoric acid functionalized fibers show green and sustainable potential for industrial production.
- Xu, Gang,Wang, Lu,Li, Mengmeng,Tao, Minli,Zhang, Wenqin
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supporting information
p. 5818 - 5830
(2017/12/26)
-
- Knoevenagel Condensation of Aldehydes and Ketones with Malononitrile Catalyzed by Amine Compounds-Tethered Fe3O4@SiO2 Nanoparticles
-
Abstract: A new magnetic nanoparticle supported-catalyst was developed for the Knoevenagel condensation between malononitrile and several aldehydes. The Fe3O4@SiO2-3N (where 3N = N1-(3-trimethoxysilylpropyl)diet
- de Resende Filho, Jo?o Batista M.,Pires, Gilvan P.,de Oliveira Ferreira, Jo?o Marcos Gomes,Teotonio, Ercules E. S.,Vale, Juliana A.
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p. 167 - 180
(2017/02/10)
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- A convenient electro-catalyzed multicomponent synthesis of 4: H -thiopyran derivatives
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An environmentally benign synthesis of substituted 4H-thiopyrans was carried out by the condensation of aromatic aldehydes, malononitrile, carbon disulfide and primary amines. Constant potential electro synthesis was carried out in an undivided cell at ro
- Dubey, Rahul,Singh, Vinay K.,Sharma, Laxmi Kant,Upadhyay, Abhishek,Kumar, Narendra,Singh, Rana Krishna Pal
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p. 7836 - 7839
(2017/08/14)
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- Knoevenagel condensation catalyzed by novel Nmm-based ionic liquids in water
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A series of novel N-methyl morpholine (Nmm) based ionic liquids with 1,2-propanediol group were synthesized and used as catalysts for Knoevenagel condensation at room temperature in water. Under the effect of the catalyst, various aldehydes or aliphatic ketones could react with a wide range of activated methylene compounds well, including malononitrile, alkyl cyanoacetate, cyanoacetamide, β-diketone, barbituric acid, 2-arylacetonitrile and thiazolidinedione. Furthermore, most of the products could be separated just by filtrating and washing with water. Additionally, the catalyst is recyclable and applicable for the large-scale synthesis.
- Xu, Hao,Pan, Liyang,Fang, Xiaomin,Liu, Baoying,Zhang, Wenkai,Lu, Minghua,Xu, Yuanqing,Ding, Tao,Chang, Haibo
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supporting information
p. 2360 - 2365
(2017/05/29)
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- Heteropolytungstostannate as a homo- and heterogeneous catalyst for Knoevenagel condensations, selective oxidation of sulfides and oxidative amination of aldehydes
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Heteropolytungstostannate K11H[P2W18O68(HOSnIVOH)3]·20H2O (1) is used as a homo- and heterogeneous catalyst for Knoevenagel condensations. New Fe3O4@SiO2@CH2(CH2)2NH3+[P2W18O68(HOSnIVOH)3]11- nanocatalyst was fabricated through electrostatic grafting of (1) on amine-modified silica-coated magnetic nanoparticles. The new magnetically recoverable nanocatalyst was characterized using infrared spectroscopy (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffractometry (XRD), energy-dispersive X-ray analysis (EDX) and alternating gradient force magnetometry (AGFM). The results indicate that the particles are mostly spherical in shape and have an average size of approximately 30 nm. The catalytic activity of the catalyst was investigated in the selective oxidation of sulfides to sulfoxides and oxidative amination of aldehydes in an aqueous medium. The catalyst was reused at least five times without significant decrease in catalytic activities, and the structure of the catalyst remained unchanged after recycling.
- Khoshnavazi, Roushan,Bahrami, Leila,Rezaei, Manuchehr
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p. 45495 - 45503
(2017/10/06)
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- Covalently anchored tertiary amine functionalized ionic liquid on silica coated nano-Fe3O4 as a novel, efficient and magnetically recoverable catalyst for the unsymmetrical Hantzsch reaction and Knoevenagel condensation
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A novel magnetic nanoparticle supported basic ionic liquid was successfully prepared by covalently anchoring 1-(2′-piperidyl)ethyl-3-(3-propyltriethoxysilane)imidazolium chloride onto the surface of silica-coated Fe3O4 nanoparticles, and characterized by FT-IR, TEM, XRD, TGA, VSM and elemental analysis. The obtained supported ionic liquid was certified as a versatile and robust catalyst for the unsymmetrical Hantzsch reaction and Knoevenagel condensation under solvent-free conditions. Furthermore, the catalyst could be conveniently recovered by an external magnet and reused six times without significant loss of catalytic activity.
- Zhang, Qiang,Ma, Xiao-Ming,Wei, Huai-Xin,Zhao, Xin,Luo, Jun
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p. 53861 - 53870
(2017/12/05)
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- Porous hierarchical magnesium oxide-based heterogeneous catalyst for the Knoevenagel condensation
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Herein, an operationally facile and efficient Knoevenagel reaction catalyzed by porous hierarchical MgO/Mg(OH)2 is presented. Condensation of various aldehydes with malononitrile proceeds under mild conditions and gives the target products with
- Deilami,Sayyahi
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p. 1085 - 1086
(2017/06/29)
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- Magnetic Fe3O4 nanoparticles supported amine: a new, sustainable and environmentally benign catalyst for condensation reactions
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Abstract: Diethylenetriamine immobilized on magnetic Fe3O4 nanoparticles (DETA-Fe3O4) was successfully prepared as a new and well dispersed magnetically separable amine catalyst. The structure of the resulting catalyst was well characterized by a series of analysis techniques such as FT-IR, SEM, EDX, VSM, TGA and XRD. The catalytic activity of DETA-Fe3O4 was evaluated with Knoevenagel condensation of active methylene compounds with aromatic aldehydes. Interestingly, the cyclocondensation of anthranilamide and aldehydes were effectively catalyzed by DETA-Fe3O4 in water, and the desired products (2,3-dihydroquinazoline-4(1H)-ones) were afforded in admirable yields. Catalysis research under aqueous medium (water) also makes this synthetic protocol ideal and fascinating from the environmental point of view. The amine catalyst can be magnetically recovered after the reaction and can be reused many times without appreciable decrease in activity.
- Shiri, Lotfi,Kazemi, Mosstafa
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p. 4813 - 4832
(2017/07/22)
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- Fe3O4–cysteamine hydrochloride magnetic nanoparticles: New, efficient and recoverable nanocatalyst for Knoevenagel condensation reaction
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Fe3O4 magnetic nanoparticles (MNPs) were obtained using a reduction–precipitation method. These MNPs were modified with cysteamine hydrochloride. This catalyst was characterized using a number of physicochemical measurements. The Fe
- Maleki, Razieh,Kolvari, Eskandar,Salehi, Mehdi,Koukabi, Nadiya
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- Synthesis and characterization of bromine source supported on magnetic Fe3O4 nanoparticles: A new, versatile and efficient magnetically separable catalyst for organic synthesis
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Tribenzylammonium tribromide supported onto magnetic nanoparticles (Br3-TBA-Fe3O4) as a bromine source was successfully synthesized and characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and vibrating sample magnetometry. The synthesized catalyst is shown to be a versatile and highly efficient heterogeneous catalyst for the Knoevenagel condensation and synthesis of 2,3-dihydroquinazolin-4(1H)-one and polyhydroquinoline derivatives. To the best of the authors' knowledge, this is the first report of the use of a bromine source immobilized on Fe3O4 nanoparticles as a magnetically separable catalyst for these reactions. The nanosolid catalyst can be magnetically recovered and reused readily several times without significant loss in catalytic efficiency.
- Shiri, Lotfi,Ghorbani-Choghamarani, Arash,Kazemi, Mosstafa
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- Microporous polyurethane material for size selective heterogeneous catalysis of the Knoevenagel reaction
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The first polyurethane material which is microporous (BET surface area of 312 m2 g-1) is prepared by solvothermal synthesis and acts as highly efficient and recyclable heterogeneous catalyst in the Knoevenagel condensation showing si
- Dey, Sandeep Kumar,De Sousa Amadeu, Nader,Janiak, Christoph
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supporting information
p. 7834 - 7837
(2016/07/06)
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- Au@Cu(II)-MOF: Highly Efficient Bifunctional Heterogeneous Catalyst for Successive Oxidation-Condensation Reactions
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A new composite Au@Cu(II)-MOF catalyst has been synthesized via solution impregnation and full characterized by HRTEM, SEM-EDS, XRD, gas adsorption-desorption, XPS, and ICP analysis. It has been shown here that the Cu(II)-framework can be a useful platform to stabilize and support gold nanoparticles (Au NPs). The obtained Au@Cu(II)-MOF exhibits a bifunctional catalytic behavior and is able to promote selective aerobic benzyl alcohol oxidation-Knoevenagel condensation in a stepwise way.
- Wang, Jing-Si,Jin, Fa-Zheng,Ma, Hui-Chao,Li, Xiao-Bo,Liu, Ming-Yang,Kan, Jing-Lan,Chen, Gong-Jun,Dong, Yu-Bin
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p. 6685 - 6691
(2016/07/16)
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- Organic-inorganic hybrid polyoxometalate and its graphene oxide-Fe3O4 nanocomposite, synthesis, characterization and their applications as nanocatalysts for the Knoevenagel condensation and the synthesis of 2,3-dihydroquinazolin-4(1: H)-ones
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The simple and high yield synthesis of H6Cu2[PPD]6[SiW9Cu3O37]·12H2O (PPD = p-phenylenediamine) as a new organic-inorganic hybrid polyoxometalate is reported. The new compound consists of trimetal-substitution polyoxometalate of A-β-SiW9Cu3O3710-, water molecules and coordinated and noncoordinated PPD molecules. H6Cu2[PPD]6[SiW9Cu3O37]·12H2O was firmly grafted on graphene oxide decorated with Fe3O4 nanoparticles. These nanocomposites were characterized by elemental analyses, thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR), X-ray photoelectron spectrum (XPS), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and alternating gradient force magnetometer (AGFM). The results indicate that the size range of the nanoparticles are between 20 and 60 nm. The catalytic activity of H6Cu2[PPD]6[SiW9Cu3O37]·12H2O and the magnetically reusable nanocomposite of GO@Fe3O4@H6Cu2[PPD]6[SiW9Cu3O37]·12H2O were investigated in the Knoevenagel condensation and synthesis of 2,3-dihydroquinazolin-4(1H)-ones.
- Khoshnavazi, Roushan,Bahrami, Leila,Havasi, Forugh
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p. 100962 - 100975
(2016/11/09)
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