- Application of structurally enhanced magnetite cored polyamidoamine dendrimer for knoevenagel condensation
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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
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- A [4+2] Condensation Strategy to Imine-Linked Single-Crystalline Zeolite-Like Zinc Phosphate Frameworks
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Double-4-ring zinc phosphate (D4R), [Zn(dipp)(4-Py-CHO)]4 (2) (dipp=diiminopyridine), bearing four formyl groups, has been utilized as a building block (SBU) for the synthesis of a new class of imine-linked [4+2] COF-like polycrystalline zinc p
- Jangir, Ritambhara,Kalita, Alok Ch.,Kaleeswaran, Dhananjayan,Gupta, Sandeep K.,Murugavel, Ramaswamy
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- Binary copper and iron oxides immobilized on silica-layered magnetite as a new reusable heterogeneous nanostructure catalyst for the Knoevenagel condensation in water
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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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- A Simple Colorimetric Chemosensor for Naked Eye Detection of Cyanide Ion
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A simple cyanide chemosensor tetranitrile compound 1 was designed and synthesized via an efficient method in the presence of nanoporous SBA-Pr-NH2 as the catalyst. The chemosensor exhibited high selectivity and sensitivity for detecting CNˉ amo
- Gholamzadeh, Parisa,Mohammadi Ziarani, Ghodsi,Lashgari, Negar,Badiei, Alireza,Shayesteh, Alireza,Jafari, Maryam
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- Photodissociation and kinetics of bis-2-benzylidenemalononitrile (BBM) in different micelles environment
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In present work, photodissociation kinetics of selective C[dbnd]C bond in BBM is investigated in different micelles concentration. In polar solvents, rate of photodissociation (k) is relatively lower compared to H2O solvent under similar condit
- Panja, Sumit Kumar
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- Selective photodissociation of highly photoactive Bis-2-benzylidenemalononitrile in solution
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Photophysical study of highly photoactive bis-2-benzylidenemalononitrile (BBM) has been investigated in solution using UV–vis, fluorescence and NMR spectroscopic techniques. The seletive photodissociation can be attributed to the presence of hi
- Kumar Panja, Sumit,Koley, Suvajit,Boumediene, Haddad
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- Calcium ferrite, an efficient catalyst for knoevenagel condensation(A green approach)
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Calcium ferrite NPs catalyst have been used as a cheaper and highly efficient catalyst for Knoevenagel condensation of active methylene substrate with various carbonyl compounds affording condensed products in excellent yields in shorter reaction time. Th
- Pippal, Parveen,Singh, Prabal Pratap
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- Enhanced catalytic activity of bio-fabricated ZnO NPs prepared by ultrasound-assisted route for the synthesis of tetraketone and benzylidenemalonitrile in hydrotropic aqueous medium
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Abstract: Mushroom-like mesoporous and hexagonal ZnO nanoparticles were synthesized from plant extract and chemical method respectively, by co-precipitation method in aqueous medium. Different morphological forms of ZnO NPs were characterized by XRD, TGA, FESEM, EDX, FTIR, UV–Vis and BET. Neem (Azadirachta indica) leaf extract and ultrasound irradiation have a crucial role in the formation of different morphologies of ZnO NPs. ZnO NPs synthesized from plant extract and hydrotrope show a synergistic effect that leads to efficient synthesis of benzylidenemalonitrile and tetraketone derivatives at room temperature in water. Simple preparation of the catalyst, excellent yields, reusability of catalyst with consistent activity and ease of product isolation are the most significant advantages of this green protocol. Graphic abstract: [Figure not available: see fulltext.]
- Attar, Suraj R.,Kamble, Santosh B.,Shinde, Bipin
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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
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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
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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)
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- Introduction of taurine (2-aminoethanesulfonic acid) as a green bio-organic catalyst for the promotion of organic reactions under green conditions
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Taurine (2-aminoethanesulfonic acid), a semi-essential amino acid that exists in the human body and numerous other living creatures, is used as a green bio-organic catalyst for the promotion of the Knoevenagel reaction between aldehydes and malononitrile. In the same way, tetraketones can also be produced through a Knoevenagel reaction, followed by Michael addition. 2-Amino-3-cyano-4H-pyran derivatives are simply prepared via a three-component reaction in the presence of taurine as the catalyst. All these reactions are performed in water, a green solvent. The advantages of using of taurine as the catalyst are it is environmentally friendly, low cost, commercially available, easy to separate from the reaction mixture, and has high reusability. Use of this catalyst results in acceptable reaction times, high yields and high purities of the obtained products without utilizing any organic solvents.
- Shirini, Farhad,Daneshvar, Nader
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p. 110190 - 110205
(2016/11/30)
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- First report of the application of simple molecular complexes as organo-catalysts for Knoevenagel condensation
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A series of molecular complexes have been designed, synthesized and used as organo-catalysts for the first time for very efficient Knoevenagel condensation. Molecular complexes are thermally stable, easily recyclable, and have a low cost of preparation. T
- Panja, Sumit Kumar,Dwivedi, Nidhi,Saha, Satyen
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p. 65526 - 65531
(2015/08/18)
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- Sulfuric acid-modified PEG-6000 (PEG-OSO3H): A biodegradable, reusable solid acid catalyst for highly efficient and eco-friendly synthesis of novel bis-Knoevenagel products under solvent-free conditions
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Sulfuric acid-modified PEG-6000 (PEG-OSO3H) is used as a highly efficient, biodegradable, and reusable acid catalyst for the synthesis of novel acyclic and heterocyclic bis-Knoevenagel products under thermal solvent-free conditions. The remarkable features of this green, new methodology are high conversions, cleaner reaction profile, simple experimental and work-up procedure, and economic viability. The catalyst is characterized for the first time by SEM-EDX and powder XRD. The catalyst can be reused several times without significant loss of its catalytic activity.
- Siddiqui, Zeba N.,Khan, Tabassum
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supporting information
p. 3759 - 3764
(2013/07/05)
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- Critical assessment of the efficiency of chitosan biohydrogel beads as recyclable and heterogeneous organocatalyst for C-C bond formation
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The effectiveness of neutral pH chitosan hydrogel beads (CSHB) as a green organocatalyst for a variety of C-C bond forming reactions (i.e. aldol reaction, Knoevenagel condensation, nitroaldol (Henry) reaction, Michael addition) has been comprehensively evaluated. Reaction rates, conversions and selectivities were studied as a function of a series of input variables including size, pH and reactive surface area of the beads, catalyst loading, temperature, molecular weight of the biopolymer, concentration, solvent system and molar ratio of reactants. Moreover, the catalytic biohydrogel beads were characterized by a variety of techniques including, among others, SEM, FT-IR, TGA and DSC.
- Kuehbeck, Dennis,Saidulu,Reddy, K. Rajender,Diaz, David Diaz
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supporting information; experimental part
p. 378 - 392
(2012/04/10)
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- Eco-friendly synthesis and biological evaluation of substituted pyrano[2,3-c]pyrazoles
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An ecofriendly green approach for synthesis of substituted pyrano[2,3-c]pyrazoles has been developed via a multicomponent one pot approach in aqueous ethanol medium under totally non-catalytic conditions. The synthesized compounds were evaluated for their
- Mandha, Santhosh Reddy,Siliveri, Sravanthi,Alla, Manjula,Bommena, Vittal Rao,Bommineni, Madhava Reddy,Balasubramanian, Sridhar
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supporting information; experimental part
p. 5272 - 5278
(2012/09/07)
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- A new silica based substituted piperidine derivative catalyzed expeditious room temperature synthesis of homo and hetero bis-Knoevenagel condensation products
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A new silica based piperidine derivative has been designed, synthesized and characterized by solid state carbon 13 CP MAS NMR, BET surface area analysis, IR, TGA studies, elemental analysis and pH experiment. This has been efficiently utilized as a recycl
- Mukhopadhyay, Chhanda,Ray, Suman
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scheme or table
p. 1496 - 1502
(2012/07/27)
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- Interactions in Molecular Crystals, 127 [1]: The Different Structures in the Crystal of Twisted 1,4-Bis(tricyanovinyl)benzene as well as of Planar 1-Tricyanovinyl-benzene, Density Functional Calculations and Reduction Behaviour Studied by Cyclovoltammetry
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The attempted crystal growth of 1,4-bis(tricyanovinyl)benzene dianion salts, although without success so far, has provided information of general interest. The crystal structures of the related mono and 1,4-bis(tricyanovinyl)benzene derivatives differ con
- Bock, Hans,Seitz, Wolfgang,Nagel, Norbert,Baur, Ruediger,Bats, Jan W.,Havlas, Zdenek,Claridge, Rodney F. C.
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p. 1125 - 1138
(2007/10/03)
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