Palladium (II) anchored on a magnetic mesoporous polymelamine–formaldehyde as new catalyst for Heck coupling reaction: optimization of reaction using response surface methodology

Published on Feb 1, 2020in Journal of Porous Materials2.496
· DOI :10.1007/S10934-019-00795-X
Zahra Shahamat2
Estimated H-index: 2
(Semnan University),
Firouzeh Nemati21
Estimated H-index: 21
(Semnan University),
Ali Elhampour16
Estimated H-index: 16
(Semnan University)
Sources
Abstract
The paper describes synthesis of a novel mesoporous and magnetically regenerated heterogeneous nanocatalyst with high catalytic activity. The synthesis strategy includes a one-step polycondensation reaction of melamine, formaldehyde and FeCl3·6H2O in a simple and sustainable manner and followed by immobilization of Pd(II) on it. Formation and properties of nanocomposite were characterized by different techniques; the results were illustrated good surface area and a well-defined mesopore structure. Also the palladium-catalyzed C–C bond formation between aryl halides and olefins was selected to survey the activity of the synthesized nanocatalyst. Central Composite Design (CCD) strategy was used to predict the optimum synthesis conditions and identify the remarkable and effective factors including temperature, period of the reaction and amount of catalyst. These results were also verified experimentally. In order to minimize systematic error, the experimental runs as a randomized fashion were accomplished.
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References59
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In the present study, for the first time, an air- and moisture-stable organoselenium–palladium complex immobilized on silica-coated magnetic nanoparticles was designed, synthesized and applied as a practical and retrievable catalyst in organic synthesis. The chemical nature and structure of this novel catalytic system were characterized using various techniques such as Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermog...
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Abstract Pd-Fe 3 O 4 hybrid nanostructures were prepared using a simple one-pot hydrothermal method. The prepared materials were characterized by Fourier transform-infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma, N 2 adsorption-desorption, and vibrating sample magnetometry. This self-assembled nanosystem acted as an efficient magnetically recyclable noble metal-based multi-funct...
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A magnetic mesoporous poly-melamine-formaldehyde composite (M-mPMF) was synthesized by covalent grafting of poly-melamine-formaldehyde onto NH2-Fe3O4 surface. The M-mPMF was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption-desorption isotherms. The result shows that the M-mPMF possesses a high porosity, large surface area and strong magnetism. The extraction performance of the M-mPMF was investigated by using it as the ma...
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An insoluble solid support of N−heterocyclic imidazolium-functionalized cage-like silsesquioxane (SQ); Bim-SQ, was synthesized by nucleophilic substitution of octakis(3-chloropropyl)octasilsesquioxane with an excess bis-(imidazol-1-yl)methane and investigated as a new organic-inorganic hybrid support. In the presence of Bim-SQ, Pd(II) from [PdCl4]2− can be stabilized via both electrostatic interactions and imidazole-N-coordination, giving an amorphous material of Pd(II)@Bim-SQ. Subsequent in sit...
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A magnetic mesoporous poly(melamine-formaldehyde) composite (Fe3O4-mPMF) was prepared via grafting poly(melamine-formaldehyde) onto the surface of amino-functionalized magnetite (Fe3O4) nanoparticles. The material was characterized by scanning electron micrography, transmission electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, nitrogen adsorption-desorption isotherms, and thermogravimetric analysis. It has a large surface area, a typical mesoporous structure, and a...
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#2Azin Shamseddin (ZNU: University of Zanjan)H-Index: 1
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To address the obstacles facing the use of palladium-based homogeneous and heterogeneous catalysts in C─C cross-coupling reactions, a novel semi-heterogeneous support was developed based on hyperbranched poly(ethylene glycol)-block-poly(citric acid)-functionalized Fe3O4 magnetic nanoparticles (Fe3O4@PCA-b-PEG). Because of the surface modification of the Fe3O4 nanoparticles with amphiphilic and hyperbranched polymers (PCA-b-PEG), these hybrid materials are not only soluble in a wide range of solv...
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Abstract Perfluoroalkyl and polyfluoroalkyl substances are priority contaminants of global concern. It is urgent to remove them from the environment. Adsorption is an efficient approach, but the adsorption capacity and regeneration of adsorbent were not satisfactory. In the present study, mesoporous melamine-formaldehyde resin microsphere (MMFRS) was fabricated through suspension polymerization. Owing to its mesoporous property and large anion-exchange capacity of 0.3 mmol/g, MMFRS was applied t...
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A palladium nanocatalyst Fe3O4@CS-SB-Pd has been synthesized and characterized by FT-IR, XRD, XPS, FESEM, EDX, TEM, TGA, and ICP-AES analysis. The nanocatalyst has been found to be an efficient and magnetically separable heterogeneous catalyst for Suzuki–Miyaura and Heck–Mizoroki coupling reactions at a low concentration (0.02 mol% of Pd). The nanocatalyst afforded arylated products with high TON (4950) and TOF (9900 h−1) in the Suzuki–Miyaura coupling reactions. However, for the Heck–Mizoroki c...
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