- Catalytic Aerial Oxidation of Biomass-Derived Furans to Furan Carboxylic Acids in Water over Bimetallic Nickel–Palladium Alloy Nanoparticles
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Bimetallic Ni1?xPdx (0.10≤x≤0.75) alloy nanoparticle catalysts were synthesised and successfully employed for the catalytic aerial oxidation of biomass-derived furans, such as 2-furfuraldehyde (furfural), 2-furfuryl alcohol (furfuryl alcohol), 5-hydroxymethyl-2-furfural (5-HMF), 5-methyl-2-furfural (MF) and 5-methyl-2-furfuryl alcohol (MFA), to selectively afford the corresponding furan carboxylic acids (2-furoic acid, furan-2,5-dicarboxylic acid (FDCA) and 5-methyl-2-furoic acid (MFCA)) in water at 80 °C. Among the studied Ni1?xPdx nanoparticle catalysts, Ni0.90Pd0.10 nanoparticle catalyst outperformed the others, achieving high yields of the corresponding furan carboxylic acid products. The presence of Ni in the Ni1?xPdx nanoparticle catalysts was advantageous, because it not only enhanced the catalytic activity for the facile oxidation of biomass-derived furans using aerial oxygen to achieve high catalytic turnover, but also provided excellent stability to the Ni0.90Pd0.10 nanoparticle catalyst towards air and water and thus significantly enhanced its recyclability (up to 10 catalytic runs). The experiments revealed that the catalytic oxidation of 5-HMF proceeded by the initial oxidation of the formyl group to carboxylic acid, and, subsequently, the conversion of alcohol to carboxylic acid via the formyl group to form FDCA. Moreover, the one-pot direct transformation of fructose to furan carboxylic acid products (such as FDCA) was also achieved by using the Ni0.90Pd0.10 nanoparticle catalyst.
- Gupta, Kavita,Rai, Rohit K.,Dwivedi, Ambikesh D.,Singh, Sanjay K.
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- PURIFIED 2,5-FURANDICARBOXYLIC ACID PATHWAY PRODUCTS
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The present disclosure provides processes for the purification of 2,5-furandicarboxylic acid (FDCA). The present disclosure further provides crystalline preparations of purified FDCA, as well as processes for making the same. In addition, the present disclosure provides mixtures used in processes for the purification of FDCA.
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Paragraph 0192
(2019/02/02)
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- Solvent-free mechanochemical oxidation and reduction of biomass-derived 5-hydroxymethyl furfural
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The simultaneous synthesis of 5-hydroxymethyl-2-furoic acid and 2,5-hydroxymethylfuran from biomass-derived 5-hydroxymethyl furan was developed using a solvent-free mechanochemical approach. The results obtained for the Cannizzaro disproportionation reaction show quantitative conversions of the starting materials with reaction times of only 5 min. Employing solvent-free conditions allows for a more sustainable synthetic approach that is reflected in an Efactor 7 times smaller than that in previous reports. Additionally, initial results of the use of a sacrificial reagent, with the same solvent-free mechanochemical approach, for the selective reduction and oxidation of HMF are presented.
- Chacón-Huete,Messina,Chen,Cuccia,Ottenwaelder,Forgione
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p. 5261 - 5265
(2018/12/05)
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- Method for preparing 2,5-furandicarboxylic acid and derivatives thereof
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The invention discloses a method for preparing 2,5-furandicarboxylic acid and derivatives thereof. The method is characterized by comprising the following steps: carrying out pericyclic reaction on hexose enzymic hydrolysate and an acid catalyst in a solvent to obtain 2,5-furandicarboxylic acid and derivatives thereof, wherein hexose is at least one out of fructose, glucose, maltose, saccharose and microcrystalline cellulose. The method has the advantages of high selectivity, few byproducts, good product purity, slight environment pollution and simplicity in process operation and is suitable for industrial production.
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Paragraph 0035-0036
(2018/03/01)
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- PROCESS FOR THE PREPARATION OF A PURIFIED ACID COMPOSITION
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A purified acid composition comprising 2,5-furandicarboxylic acid is prepared by a process comprising a) providing an acid composition solution of a crude acid composition in a polar solvent, the crude acid composition comprising 2,5-furandicarboxylic acid (FDCA) and 2-formyl-furan-5- carboxylic acid (FFCA); b) contacting the acid composition solution with hydrogen in the presence of a hydrogenation catalyst to hydrogenate FFCA to hydrogenation products, such that the hydrogenation products contain a minor amount of 2-methyl-furan-5-carboxylic acid (MFA) or no MFA, yielding a hydrogenated solution; c) separating at least a portion of the FDCA from the hydrogenated solution by crystallization.
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Page/Page column 16-17
(2016/12/22)
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- One-step synthesis of furan-2,5-dicarboxylic acid from furan-2-carboxylic acid using carbon dioxide
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A short and effective method for preparation and isolation of furan-2,5-dicarboxylic acid has been developed. Furan-2,5-dicarboxylic acid was prepared directly from furan-2-carboxylic acid in one step under strong basic conditions using carbon dioxide. This method allows to obtain the product with high added value, furan-2,5-dicarboxylic acid, from natural sources such as hemicelluloses containing pentoses. ARKAT-USA, Inc.
- Fischer, Robert,Fiserova, Maria
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p. 405 - 412
(2014/01/23)
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- Cephalosporins and homologues, preparations and pharmaceutical compositions
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β-Lactam antibiotics of formula (I) or a salt thereof, wherein R1 is hydrogen, methoxy or formamido; R2 is an acyl group; CO2 R3 is a carboxy group or a carboxylate anion, or R3 is a readily removable
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- REACTIONS OF ALDEHYDES OF THE FURAN SERIES. 3. OXIDATIVE-REDUCTIVE CONVERSIONS ON THE SURFACE OF ALKALI GRANULES
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Furan aldehydes undergo an oxidative-reductive disproportionation over solid alkali in a solvent inert to alkali.Molecular oxygen increases the yield of the furan carboxylic acid.A reaction scheme is proposed that takes into account the important role of alkoholates of gem-polyols.
- Shapiro, Yu. M.,Smolyakov, V. P.,Kul'nevich, V. G.
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p. 617 - 620
(2007/10/02)
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- REACTION OF ALDEHYDES OF THE FURAN SERIES. 2. OXIDATION WITH SODIUM HYPOHALITES
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The condition for the oxidation of formylfurans with sodium hypobromite and hypochlorite that promote an increase in the yields for the furancarboxylic acids were investigated.The usual composition of the hypohalite mixture : = 3 gives low yields of the furancarboxylic acids, particularly on the basis of 5-methylfurfural.Doubling the relative percentage of alkali promotes an increase in the efficiency of the reaction.An interpretation of the process is given.
- Shapiro, Yu. M.,Pustovarova, O.P.,Baum, E.,Kul'nevich, V.G.
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p. 1132 - 1136
(2007/10/02)
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