The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Masoud Mokhtary - One of the best experts on this subject based on the ideXlab platform.
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Application of PVPP-OXA as an efficient catalyst for the synthesis of mono and bulky 1,8-dioxooctahydroxanthenes
2019Co-Authors: Reza Dezhanga, Masoud MokhtaryAbstract:An efficient method for the synthesis of mono and bulky 1,8-dioxooctahydroxanthenes was developed by the reaction of dimedone or 1,3-cyclohexadione and aldehydes or some bisaldehydes in the presence of Polyvinylpolypyrrolidone supported oxalic acid (PVPP-OXA) as a new polymeric catalyst in ethanol at room temperature. Polyvinylpolypyrrolidone supported oxalic acid was characterized by FT-IR, and TGA analysis. Clean methodologies, simple preparation of the catalyst, high yields, environment-friendly and reusable catalyst are some advantages of this work.
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Polyvinylpolypyrrolidone supported chlorosulfonic acid: An efficient catalyst for the one-pot synthesis of hexahydroquinolines
iranian journal of catalysis, 2016Co-Authors: Mahshid Yosefzadeh, Masoud MokhtaryAbstract:Polyvinylpolypyrrolidone supported chlorosulfonic acid ([PVPP-SO3H] + Cl - ) was synthesized and evaluated as a recoverable catalyst for the one-pot synthesis of hexahydroquinolines by reaction of arylaldehydes, dimedone (5,5-dimethylcyclohexane1,3-dione) or 1,3-cyclohexanedione, ethylacetoacetate and ammonium acetate in high to excellent yield in ethanol at 70 °C. The [PVPP-SO3H] + Cl - catalyst was characterized via Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The acidity strength of the catalyst was determined by titration and found to be 12 mmol/g, which shows a high loading of H + per gram of the catalyst. Moreover, the catalyst could be recycled several times without significant loss of its catalytic activity. Clean methodologies, easy work-up procedure, high yield and simple preparation of the catalyst are some advantages of this work.
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Polyvinylpolypyrrolidone-supported boron trifluoride: a mild and efficient catalyst for the synthesis of 1,8-dioxooctahydroxanthenes and 1,8-dioxodecahydroacridines
Monatshefte Fur Chemie, 2014Co-Authors: Masoud Mokhtary, Seyed Abdollah Mirfarjood LangroudiAbstract:Polyvinylpolypyrrolidone-supported boron trifluoride has been studied for the synthesis of 1,8-dioxooctahydroxanthenes and 1,8-dioxodecahydroacridines. The reaction proceeded via condensation of: (1) aromatic aldehydes (1 eq.) and 5,5-dimethyl-1,3-cyclohexanedione (2 eq.) in acetonitrile at room temperature, (2) aromatic aldehydes (1 eq.), 5,5-dimethyl-1,3-cyclohexanedione (2 eq.), and aromatic amines (1 eq.) in acetonitrile at 80 °C in the presence of Polyvinylpolypyrrolidone-supported boron trifluoride. This procedure cleanly converted a variety of aryl aldehydes with different substituent groups at ortho, meta, or para positions to the corresponding products. Convenience and efficiency, an easy work-up procedure, high yield, and simple preparation of the catalyst are some advantages of this method. In addition, the Polyvinylpolypyrrolidone-supported boron trifluoride complex is a high loaded Lewis acid, which is stable, easy to handle, and retains effective activity after several months of storage.
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Polyvinylpolypyrrolidone-supported boron trifluoride (PVPP-BF3): Mild and efficient catalyst for the synthesis of 14-aryl-14H-dibenzo [a,j] xanthenes and bis(naphthalen-2-yl-sulfane) derivatives
Dyes and Pigments, 2013Co-Authors: Masoud Mokhtary, Sepideh RefahatiAbstract:Abstract A convenient and an efficient method for the synthesis of 14-aryl-14 H -dibenzo [a,j] xanthenes and bis(naphthalen-2-yl-sulfane) derivatives is described. The reaction proceeded via condensation of aldehydes with 2-naphthol or 2-thionaphthol in the presence of Polyvinylpolypyrrolidone-supported boron trifluoride. These reactions were studied under different conditions. In terms of reaction time and yield, it was found that optimum results were obtained for the synthesis of 14-aryl-14 H -dibenzo [a,j] xanthenes under solvent free technique at 120 O C and for preparation of bis(naphthalen-2-yl-sulfane) derivatives in 1,2-dichloroethan under reflux conditions. Clean methodologies, easy workup procedure, high yield and simple preparation of the catalyst are some advantages of this work.
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Polyvinylpolypyrrolidone-bound boron trifluoride (PVPP-BF3); a mild and efficient catalyst for synthesis of 4-metyl coumarins via the Pechmann reaction
Comptes Rendus Chimie, 2012Co-Authors: Masoud Mokhtary, Faranak NajafizadehAbstract:Abstract Polyvinylpolypyrrolidone-supported boron trifluoride has been studied for synthesis of 4-methyl coumarin by the Pechmann reaction. The reaction proceeded smoothly with hydroxyl phenols and ethyl acetoacetate in good yields in ethanol at reflux conditions. The Polyvinylpolypyrrolidone-boron trifluoride complex is a non-corrosive and stable solid catalyst elevated Lewis acid property.
Samad Khaksar - One of the best experts on this subject based on the ideXlab platform.
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Reusable and efficient Polyvinylpolypyrrolidone-supported triflic acid catalyst for acylation of alcohols, phenols, amines, and thiols under solvent-free conditions
Monatshefte Fur Chemie, 2017Co-Authors: Mahgol Tajbakhsh, Samad Khaksar, Mahmoud Tajbakhsh, Helia Janatian Gazvini, Marzieh HeidaryAbstract:A triflic acid-functionalized Polyvinylpolypyrrolidone was prepared and fully characterized by FT-IR, TGA, and SEM. This super acidic solid catalyst shows high catalytic activity for selective acylation of alcohols, phenols, amines, and thiols with anhydrides under solvent-free conditions at room temperature. In addition, this method features an easy to handle solid super acid catalyst and an operationally simple procedure, affording the desired acylated products in excellent yields.
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A highly efficient procedure for the synthesis of quinoxaline derivatives using Polyvinylpolypyrrolidone supported triflic acid catalyst （PVPP.OTf）
Chinese Chemical Letters, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad Gholami, Fariba RostamnezhadAbstract:Abstract A Polyvinylpolypyrrolidone supported triflic acid was shown to be useful as a recyclable heterogeneous catalyst for the rapid and efficient synthesis of quinoxaline derivatives in good-to-excellent yields. The catalyst is easily prepared, air-stable, reusable, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone supported triflic acid pvpp otf as a new efficient and recyclable heterogeneous catalyst for the synthesis of bis indolyl methane derivatives
Comptes Rendus Chimie, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a new, efficient, and recyclable heterogeneous catalyst for the synthesis of bis-indolyl methane derivatives
Comptes Rendus Chimie, 2013Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
Milad Gholami - One of the best experts on this subject based on the ideXlab platform.
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A highly efficient procedure for the synthesis of quinoxaline derivatives using Polyvinylpolypyrrolidone supported triflic acid catalyst （PVPP.OTf）
Chinese Chemical Letters, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad Gholami, Fariba RostamnezhadAbstract:Abstract A Polyvinylpolypyrrolidone supported triflic acid was shown to be useful as a recyclable heterogeneous catalyst for the rapid and efficient synthesis of quinoxaline derivatives in good-to-excellent yields. The catalyst is easily prepared, air-stable, reusable, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone supported triflic acid pvpp otf as a new efficient and recyclable heterogeneous catalyst for the synthesis of bis indolyl methane derivatives
Comptes Rendus Chimie, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a new, efficient, and recyclable heterogeneous catalyst for the synthesis of bis-indolyl methane derivatives
Comptes Rendus Chimie, 2013Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
Mahmoud Tajbakhsh - One of the best experts on this subject based on the ideXlab platform.
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Reusable and efficient Polyvinylpolypyrrolidone-supported triflic acid catalyst for acylation of alcohols, phenols, amines, and thiols under solvent-free conditions
Monatshefte Fur Chemie, 2017Co-Authors: Mahgol Tajbakhsh, Samad Khaksar, Mahmoud Tajbakhsh, Helia Janatian Gazvini, Marzieh HeidaryAbstract:A triflic acid-functionalized Polyvinylpolypyrrolidone was prepared and fully characterized by FT-IR, TGA, and SEM. This super acidic solid catalyst shows high catalytic activity for selective acylation of alcohols, phenols, amines, and thiols with anhydrides under solvent-free conditions at room temperature. In addition, this method features an easy to handle solid super acid catalyst and an operationally simple procedure, affording the desired acylated products in excellent yields.
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A highly efficient procedure for the synthesis of quinoxaline derivatives using Polyvinylpolypyrrolidone supported triflic acid catalyst （PVPP.OTf）
Chinese Chemical Letters, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad Gholami, Fariba RostamnezhadAbstract:Abstract A Polyvinylpolypyrrolidone supported triflic acid was shown to be useful as a recyclable heterogeneous catalyst for the rapid and efficient synthesis of quinoxaline derivatives in good-to-excellent yields. The catalyst is easily prepared, air-stable, reusable, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone supported triflic acid pvpp otf as a new efficient and recyclable heterogeneous catalyst for the synthesis of bis indolyl methane derivatives
Comptes Rendus Chimie, 2014Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
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Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a new, efficient, and recyclable heterogeneous catalyst for the synthesis of bis-indolyl methane derivatives
Comptes Rendus Chimie, 2013Co-Authors: Samad Khaksar, Mahmoud Tajbakhsh, Milad GholamiAbstract:Abstract A simple, inexpensive, environmentally friendly and efficient route for the synthesis of bis-indolyl methane derivatives by the reaction of indole or N -methyl indole with aldehydes using Polyvinylpolypyrrolidone-supported triflic acid (PVPP·OTf) as a catalyst is described. PVPP·OTf catalyst is air-stable, heterogeneous, cost-effective, easy to handle, and easily removed from the reaction mixtures.
Fernando M Nunes - One of the best experts on this subject based on the ideXlab platform.
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holistic and sustainable approach for recycling and valorization of Polyvinylpolypyrrolidone used in wine fining
ACS Sustainable Chemistry & Engineering, 2018Co-Authors: Sandrine S Ferreira, Ana J Alves, Luis Filiperibeiro, Fernanda Cosme, Fernando M NunesAbstract:Polyvinylpolypyrrolidone (PVPP) is a synthetic water-insoluble polymer widely used as fining agent in the wine industry for removing low-molecular-weight phenolics. Used PVPP, estimated in 2014 of ...