The Experts below are selected from a list of 3936 Experts worldwide ranked by ideXlab platform
Luigi Vaccaro - One of the best experts on this subject based on the ideXlab platform.
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a waste minimized protocol for copper catalyzed ullmann type reaction in a biomass derived Furfuryl Alcohol water azeotrope
Green Chemistry, 2018Co-Authors: Francesco Ferlin, Valeria Trombettoni, Lorenzo Luciani, Soliver Fusi, Oriana Piermatti, Stefano Santoro, Luigi VaccaroAbstract:We report the use of biomass-derived Furfuryl Alcohol as an effective bidentate ligand able to promote the Ullmann-type copper-catalyzed coupling of aryl halides with heteroaromatic or aliphatic amines. Furfuryl Alcohol (FA) can be mixed with water to form the corresponding azeotrope (20 wt% of FA) and therefore can be easily recovered and reused. This protocol is efficiently applied to substrates with various electronic nature and affords the expected products (27 examples) in generally good to excellent yields. It has also been demonstrated that the protocol is both chemically and environmentally effective as the azeotropic mixture can be easily and almost quantitatively recovered at the end of the process.
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searching for novel reusable biomass derived solvents Furfuryl Alcohol water azeotrope as a medium for waste minimised copper catalysed azide alkyne cycloaddition
Green Chemistry, 2016Co-Authors: Dace Rasina, Francesco Ferlin, Stefano Santoro, Aurora Lombi, Luigi VaccaroAbstract:Herein, we report the first application of the Furfuryl Alcohol/water azeotrope as a sustainable and easily recoverable reaction medium in organic chemistry. The applicability of this novel medium was tested in copper-catalysed azide–alkyne cycloaddition (CuAAC), a reaction usually conducted in mixtures of water and an organic solvent. Our reaction conditions allowed the isolation of the expected triazoles in generally good yields and usually in shorter times compared to classical reaction conditions, also proving a wide substrate scope. A large fraction of the Furfuryl Alcohol/water azeotrope can be recovered by simple distillation at the end of the reaction, which results in a dramatic decrease in waste production and E-factors, compared to typically employed CuAAC procedures.
Vijaykumar V Mahajani - One of the best experts on this subject based on the ideXlab platform.
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kinetics of liquid phase hydrogenation of Furfuryl Alcohol to tetrahydroFurfuryl Alcohol over a ru tio2 catalyst
Industrial & Engineering Chemistry Research, 2007Co-Authors: Manoj A Tike, Vijaykumar V MahajaniAbstract:The kinetics of the liquid-phase hydrogenation of Furfuryl Alcohol (FA) to a green solventtetrahydroFurfuryl Alcohol (THFA)over a 5% Ru/TiO2 catalyst was studied in a slurry reactor. Hydrogenation of Furfuryl Alcohol was carried out at a hydrogen pressure of 0.68−4.08 MPa and temperature in the range 313−363 K. The selectivity toward THFA was >97% at and below 333 K reaction temperature. Various Ru supported catalysts and solvents were screened during hydrogenation of Furfuryl Alcohol. Among the catalysts tested, 5% Ru/TiO2 was found to be the more active catalyst for the hydrogenation of FA using 2-propanol as a solvent. The kinetic data were analyzed using the power-law model. A single-site Langmuir−Hinshelwood-type model suggesting molecular adsorption (nondissociative) of hydrogen and surface reaction as the rate-controlling mechanism with the product inhibition step provided the best fit of the experimental data. Catalyst could be recycled with good selectivity.
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kinetics of liquid phase hydrogenation of furfuraldehyde to Furfuryl Alcohol over a pt c catalyst
Industrial & Engineering Chemistry Research, 2003Co-Authors: Prakash Vaidya D And, Vijaykumar V MahajaniAbstract:The kinetics of the liquid-phase hydrogenation of furfuraldehyde to Furfuryl Alcohol over a 5% Pt/C catalyst was studied in a slurry reactor. The solvent used was a mixture of 2-propanol and water ...
Peter C Stair - One of the best experts on this subject based on the ideXlab platform.
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thermodynamics and reaction pathways of Furfuryl Alcohol oligomer formation
Catalysis Communications, 2014Co-Authors: Rajeev S Assary, Larry A. Curtiss, Peter C Stair, Christopher L Marshall, Taejin Kim, Richard E PaulsAbstract:Abstract The acid-catalyzed transformation of Furfuryl Alcohol (FA) monomer to oligomers has been studied in the liquid phase to investigate the reaction mechanisms and intermediate species by using a combination of quantitative reaction product measurements and density functional theory calculations. FA monomer was converted into oligomers with a broad range of carbon number: C 9 –C 10 , C 14 –C 15 , C 19 –C 29 , > C 29 . Based on the calculations, terminal CH 2 OH dimer formation is both kinetically and thermodynamically favored, consistent with the experimental results. The order for dimer production in the C 9 –C 10 range follows terminal CH 2 OH > ether bridged–methylene bridged dimer > OH-carbon bridge.
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effects of solvent on the Furfuryl Alcohol polymerization reaction uv raman spectroscopy study
Catalysis Today, 2013Co-Authors: Rajeev S Assary, Larry A. Curtiss, David J. Gosztola, Peter C Stair, Christopher L MarshallAbstract:Abstract The effect of Alcohol as a solvent on the acid-catalyzed conversion of Furfuryl Alcohol ( FA ) into polymerized Furfuryl Alcohol ( PFA ) has been studied by UV Raman spectroscopy. The major peak intensity ratios were compared to gain quantitative information about the extent of polymerization in various solvents. The reaction rate of the polymerization has been found to significantly decrease with increasing concentrations of ethanol or butanol ( n -butanol and iso -butanol). Compared to ethanol, longer or branched chain Alcohols such as n -butanol and iso -butanol can marginally reduce the acid-catalyzed polymerization at room temperature. The plot of reciprocal intensity of the characteristic Raman band of FA vs. the reaction time suggests that the polymerization reactions follow second-order kinetics.
Alessandro Gandini - One of the best experts on this subject based on the ideXlab platform.
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acid catalyzed polycondensation of Furfuryl Alcohol mechanisms of chromophore formation and cross linking
Macromolecules, 1996Co-Authors: Mekki Choura, Naceur Belgacem, Alessandro GandiniAbstract:A thorough investigation of the acid-catalyzed polycondensation of Furfuryl Alcohol was conducted with the specific aim of understanding the mechanisms responsible for the main reaction, but more p...
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acid catalyzed polycondensation of Furfuryl Alcohol mechanisms of chromophore formation and cross linking
Macromolecules, 1996Co-Authors: Mekki Choura, Naceur Belgacem, Alessandro GandiniAbstract:A thorough investigation of the acid-catalyzed polycondensation of Furfuryl Alcohol was conducted with the specific aim of understanding the mechanisms responsible for the main reaction, but more particularly for the transformation of linear unconjugated oligomers into black cross-linked final materials. The originality of the present approach, compared with previous unsuccessful attempts, consisted in calling upon numerous model compounds simulating specific features of both the monomer and its condensation products. The formation of conjugated sequences along the poly(Furfuryl) chains is caused by repetitive cycles involving the loss of hydride ions followed by the deprotonation of the carbenium ions thus formed. This reaction was simulated and accelerated by using cationic hydride-ion abstractors. The branching reactions only occur after the appearance of the multiple unsaturations and owe their origin to interchain cycloadditions between furan rings and conjugated structures. A long-standing puzzle ha...
Francesco Ferlin - One of the best experts on this subject based on the ideXlab platform.
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a waste minimized protocol for copper catalyzed ullmann type reaction in a biomass derived Furfuryl Alcohol water azeotrope
Green Chemistry, 2018Co-Authors: Francesco Ferlin, Valeria Trombettoni, Lorenzo Luciani, Soliver Fusi, Oriana Piermatti, Stefano Santoro, Luigi VaccaroAbstract:We report the use of biomass-derived Furfuryl Alcohol as an effective bidentate ligand able to promote the Ullmann-type copper-catalyzed coupling of aryl halides with heteroaromatic or aliphatic amines. Furfuryl Alcohol (FA) can be mixed with water to form the corresponding azeotrope (20 wt% of FA) and therefore can be easily recovered and reused. This protocol is efficiently applied to substrates with various electronic nature and affords the expected products (27 examples) in generally good to excellent yields. It has also been demonstrated that the protocol is both chemically and environmentally effective as the azeotropic mixture can be easily and almost quantitatively recovered at the end of the process.
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searching for novel reusable biomass derived solvents Furfuryl Alcohol water azeotrope as a medium for waste minimised copper catalysed azide alkyne cycloaddition
Green Chemistry, 2016Co-Authors: Dace Rasina, Francesco Ferlin, Stefano Santoro, Aurora Lombi, Luigi VaccaroAbstract:Herein, we report the first application of the Furfuryl Alcohol/water azeotrope as a sustainable and easily recoverable reaction medium in organic chemistry. The applicability of this novel medium was tested in copper-catalysed azide–alkyne cycloaddition (CuAAC), a reaction usually conducted in mixtures of water and an organic solvent. Our reaction conditions allowed the isolation of the expected triazoles in generally good yields and usually in shorter times compared to classical reaction conditions, also proving a wide substrate scope. A large fraction of the Furfuryl Alcohol/water azeotrope can be recovered by simple distillation at the end of the reaction, which results in a dramatic decrease in waste production and E-factors, compared to typically employed CuAAC procedures.
