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Papers by Taghi A. Kamali
Turkish Journal of Chemistry, 2010
An efficient one-pot method for the synthesis of 1,4-dihydropyridines from b-dicarbonyl compounds... more An efficient one-pot method for the synthesis of 1,4-dihydropyridines from b-dicarbonyl compounds, aldehyde, and ammonium acetate is reported using sulfonic acid-functionalized silica at 90 °C under solvent-free conditions with good to excellent yields. The catalyst is easily prepared, stable (up to 300 °C), reusable, and efficiently used under reaction conditions.
Journal of Molecular Structure, 2021
The utilization of various tetrazoles as efficient ligands is a promising method for the function... more The utilization of various tetrazoles as efficient ligands is a promising method for the functionalization of tetrazole-based heterogeneous catalysts. Their combination with magnetic species and natural supports exposes huge opportunities for the practical applications of heterogeneous catalysts. In this study, a green and novel strategy is applied to synthesize Fe3O4 magnetic nanoparticles (MNPs) incorporated with chitosan (CS) and 5-amino-1H-tetrazole with a long tail ((3-chloropropyl)trimethoxysilane) to immobilize palladium catalyst designated as Fe3O4 CS@tet-Pd(II). The prepared Fe3O4 CS@tet-Pd(II) was used as an efficient and magnetically recyclable catalyst for the Suzuki-Miyaura cross-coupling reaction (SMCR) using a mixture of EtOH/H2O as green media under aerobic conditions. All the expected products were obtained in high yields, indicating the high efficiency of this catalyst for the preparation of various biaryls by SMCR. Various latest techniques were used to characteri...
Journal of Molecular Liquids, 2021
Organic materials produced from diverse industries such as paint, leather, textile, etc., produce... more Organic materials produced from diverse industries such as paint, leather, textile, etc., produce various challenging pollutants in the environment. Today, the development of effective methods to remove pollutants is a vital and fundamental issue. One of the effective ways to remove these pollutants from the environment is to use heterogeneous catalysts. In recent decades, polymer-based metal catalysts have received much attention as effective and heterogeneous catalysts. Among various metals, silver (Ag) has unique properties and is appropriate for environmental remediation. This review summarized the recent progress in synthesizing polymer-supported Ag complexes/nanoparticles and their applications for environmental remediation. Application of polymer-supported Ag complexes/nanoparticles suggested some advantages like high catalytic ability, reusability, direct preparation, and simple work-up.
International Journal of Biological Macromolecules
Journal of colloid and interface science, 2016
An efficient and new method for the synthesis of formamides using HZSM-5 zeolite supported copper... more An efficient and new method for the synthesis of formamides using HZSM-5 zeolite supported copper oxide nanoparticles as an efficient and heterogeneous catalyst is reported. The catalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), Brunauer-Emmett-Teller (BET), energy dispersive X-ray spectroscopy (EDS), temperature programmed desorption of ammonia (TPD-NH3) and Fourier transformed infrared spectroscopy (FT-IR). This method has the advantages of eliminating homogeneous catalysts and provides simple methodology with easy work up. Excellent yields of the corresponding formamides were obtained through this cost-effective protocol under solvent-free conditions with shorter reaction time. The catalyst was easily isolated from the reaction mixture by filtration and reused several times without significant loss in its catalytic.
Monatshefte für Chemie - Chemical Monthly, 2016
This paper reports on the preparation and use of chloromethylated polystyrene-anchored palladium(... more This paper reports on the preparation and use of chloromethylated polystyrene-anchored palladium(II) complex, [Ps-ttet-Pd(II)], as a separable nanocatalyst for the synthesis of 5-substituted 1H-tetrazoles by treating aryl halides with K4[Fe(CN)6] as non-toxic cyanide source, to generate in situ the corresponding aryl nitriles which then react through [2 + 3] cycloaddition with sodium azide. High yields of the products, simple methodology, easy work-up procedure, high catalytic activity, and superior cycling stability of the catalyst are the main advantages of this protocol. The structure of the catalyst was characterized using the powder XRD, SEM, TG-DTA, EDS, AAS, and FT-IR spectroscopy techniques.Graphical abstract
Journal of the Brazilian Chemical Society
Green Chemistry, 2011
Instrumentation, Analysis and Starting Materials 2 Experimental 2 Typical procedure for preparati... more Instrumentation, Analysis and Starting Materials 2 Experimental 2 Typical procedure for preparation of the 1-substituted 1H-1,2,3,4-tetrazoles 2 Fig S1: XRD pattern of the Natrolite zeolite 2 Fig S2: FT-IR spectrum of the Natrolite zeolite 3 Information on sodium azide: An effective reagent in organic synthesis 3 References 6
Journal of Alloys and Compounds, 2016
Abstract During this paper, the Ag/HZSM-5 nanocomposite has been successfully synthesized by usin... more Abstract During this paper, the Ag/HZSM-5 nanocomposite has been successfully synthesized by using an aqueous extract of Euphorbia heterophylla leaves as a stabilizing and reducing agent. The green synthesized Ag/HZSM-5 nanocomposite was characterized by FT-IR (Fourier transform infrared spectroscopy), FESEM (field emission scanning electron microscopy), EDS (energy dispersion X-ray spectroscopy), UV–vis, XRD (X-ray powder diffraction) and elemental mapping. The Ag/HZSM-5 nanocomposite was found to be efficient nanocatalyst for the reduction of organic dyes such as Methylene blue (MB), Congo red (CR), Rhodamine B (RhB) and 4-nitrophenol (4-NP) in water at room temperature. The catalytic activities of the nanocatalyst in reactions were monitored by using UV–vis spectroscopy. Interestingly, the Ag/HZSM-5 catalyst can be easily recovered and reused several times without any significant loss of catalytic efficiency.
Synlett, 2009
The Sonogashira reaction, palladium-and copper-cocatalyzed coupling of terminal alkynes with aryl... more The Sonogashira reaction, palladium-and copper-cocatalyzed coupling of terminal alkynes with aryl and vinyl halides, is a widely used CC bond-forming reaction. [²] [³] It provides an efficient route to aryl alkynes, which are interesting intermediates for the preparation of a variety of ...
Turkish Journal of Chemistry, 2010
An efficient one-pot method for the synthesis of 1,4-dihydropyridines from b-dicarbonyl compounds... more An efficient one-pot method for the synthesis of 1,4-dihydropyridines from b-dicarbonyl compounds, aldehyde, and ammonium acetate is reported using sulfonic acid-functionalized silica at 90 °C under solvent-free conditions with good to excellent yields. The catalyst is easily prepared, stable (up to 300 °C), reusable, and efficiently used under reaction conditions.
Journal of Molecular Structure, 2021
The utilization of various tetrazoles as efficient ligands is a promising method for the function... more The utilization of various tetrazoles as efficient ligands is a promising method for the functionalization of tetrazole-based heterogeneous catalysts. Their combination with magnetic species and natural supports exposes huge opportunities for the practical applications of heterogeneous catalysts. In this study, a green and novel strategy is applied to synthesize Fe3O4 magnetic nanoparticles (MNPs) incorporated with chitosan (CS) and 5-amino-1H-tetrazole with a long tail ((3-chloropropyl)trimethoxysilane) to immobilize palladium catalyst designated as Fe3O4 CS@tet-Pd(II). The prepared Fe3O4 CS@tet-Pd(II) was used as an efficient and magnetically recyclable catalyst for the Suzuki-Miyaura cross-coupling reaction (SMCR) using a mixture of EtOH/H2O as green media under aerobic conditions. All the expected products were obtained in high yields, indicating the high efficiency of this catalyst for the preparation of various biaryls by SMCR. Various latest techniques were used to characteri...
Journal of Molecular Liquids, 2021
Organic materials produced from diverse industries such as paint, leather, textile, etc., produce... more Organic materials produced from diverse industries such as paint, leather, textile, etc., produce various challenging pollutants in the environment. Today, the development of effective methods to remove pollutants is a vital and fundamental issue. One of the effective ways to remove these pollutants from the environment is to use heterogeneous catalysts. In recent decades, polymer-based metal catalysts have received much attention as effective and heterogeneous catalysts. Among various metals, silver (Ag) has unique properties and is appropriate for environmental remediation. This review summarized the recent progress in synthesizing polymer-supported Ag complexes/nanoparticles and their applications for environmental remediation. Application of polymer-supported Ag complexes/nanoparticles suggested some advantages like high catalytic ability, reusability, direct preparation, and simple work-up.
International Journal of Biological Macromolecules
Journal of colloid and interface science, 2016
An efficient and new method for the synthesis of formamides using HZSM-5 zeolite supported copper... more An efficient and new method for the synthesis of formamides using HZSM-5 zeolite supported copper oxide nanoparticles as an efficient and heterogeneous catalyst is reported. The catalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), Brunauer-Emmett-Teller (BET), energy dispersive X-ray spectroscopy (EDS), temperature programmed desorption of ammonia (TPD-NH3) and Fourier transformed infrared spectroscopy (FT-IR). This method has the advantages of eliminating homogeneous catalysts and provides simple methodology with easy work up. Excellent yields of the corresponding formamides were obtained through this cost-effective protocol under solvent-free conditions with shorter reaction time. The catalyst was easily isolated from the reaction mixture by filtration and reused several times without significant loss in its catalytic.
Monatshefte für Chemie - Chemical Monthly, 2016
This paper reports on the preparation and use of chloromethylated polystyrene-anchored palladium(... more This paper reports on the preparation and use of chloromethylated polystyrene-anchored palladium(II) complex, [Ps-ttet-Pd(II)], as a separable nanocatalyst for the synthesis of 5-substituted 1H-tetrazoles by treating aryl halides with K4[Fe(CN)6] as non-toxic cyanide source, to generate in situ the corresponding aryl nitriles which then react through [2 + 3] cycloaddition with sodium azide. High yields of the products, simple methodology, easy work-up procedure, high catalytic activity, and superior cycling stability of the catalyst are the main advantages of this protocol. The structure of the catalyst was characterized using the powder XRD, SEM, TG-DTA, EDS, AAS, and FT-IR spectroscopy techniques.Graphical abstract
Journal of the Brazilian Chemical Society
Green Chemistry, 2011
Instrumentation, Analysis and Starting Materials 2 Experimental 2 Typical procedure for preparati... more Instrumentation, Analysis and Starting Materials 2 Experimental 2 Typical procedure for preparation of the 1-substituted 1H-1,2,3,4-tetrazoles 2 Fig S1: XRD pattern of the Natrolite zeolite 2 Fig S2: FT-IR spectrum of the Natrolite zeolite 3 Information on sodium azide: An effective reagent in organic synthesis 3 References 6
Journal of Alloys and Compounds, 2016
Abstract During this paper, the Ag/HZSM-5 nanocomposite has been successfully synthesized by usin... more Abstract During this paper, the Ag/HZSM-5 nanocomposite has been successfully synthesized by using an aqueous extract of Euphorbia heterophylla leaves as a stabilizing and reducing agent. The green synthesized Ag/HZSM-5 nanocomposite was characterized by FT-IR (Fourier transform infrared spectroscopy), FESEM (field emission scanning electron microscopy), EDS (energy dispersion X-ray spectroscopy), UV–vis, XRD (X-ray powder diffraction) and elemental mapping. The Ag/HZSM-5 nanocomposite was found to be efficient nanocatalyst for the reduction of organic dyes such as Methylene blue (MB), Congo red (CR), Rhodamine B (RhB) and 4-nitrophenol (4-NP) in water at room temperature. The catalytic activities of the nanocatalyst in reactions were monitored by using UV–vis spectroscopy. Interestingly, the Ag/HZSM-5 catalyst can be easily recovered and reused several times without any significant loss of catalytic efficiency.
Synlett, 2009
The Sonogashira reaction, palladium-and copper-cocatalyzed coupling of terminal alkynes with aryl... more The Sonogashira reaction, palladium-and copper-cocatalyzed coupling of terminal alkynes with aryl and vinyl halides, is a widely used CC bond-forming reaction. [²] [³] It provides an efficient route to aryl alkynes, which are interesting intermediates for the preparation of a variety of ...