scholarly journals AuPd-nNiO as an effective catalyst for the base-free oxidation of HMF under mild reaction conditions

2019 ◽  
Vol 21 (15) ◽  
pp. 4090-4099 ◽  
Author(s):  
Danilo Bonincontro ◽  
Alice Lolli ◽  
Alberto Villa ◽  
Laura Prati ◽  
Nikolaos Dimitratos ◽  
...  
Keyword(s):  
High Activity ◽  
Reaction Conditions ◽  
Effective Catalyst ◽  
Furandicarboxylic Acid ◽  
Free Oxidation

AuPd nanoparticles supported on NiO exhibit high activity and stability in the base free oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA).

Catalytic Application of H4SiW12O40/SiO2 in Synthesis of Acetals and Ketals

2011 ◽  
Vol 284-286 ◽  
pp. 2374-2379 ◽  
Author(s):  
Shui Jin Yang ◽  
Yong Kui Huang ◽  
Li Yu
Keyword(s):  
Reaction Time ◽  
High Activity ◽  
Sol Gel ◽  
Reaction Parameters ◽  
Reaction Conditions ◽  
Catalytic Application ◽  
Ft Ir ◽  
Gel Technique ◽  
Catalyst Dosage ◽  
Novel Catalyst

A novel catalyst, H4SiW12O40/SiO2was synthesized by a sol-gel technique, and characterized by FT-IR and XRD. Catalytic application of H4SiW12O40/SiO2for synthesis of acetals and ketals were tested. The variation of different reaction parameters, such as mole ratio of aldehyde/ketone to alcohols, catalyst dosage and reaction time on the yield of acetals and ketals were also studied. The results reveal that the H4SiW12O40/SiO2catalysis generally results in good yields of acetals and ketals under mild reaction conditions and the high activity and stability of the catalyst is well retained on recycling.

Formation of nanostructured polyaniline by dopant-free oxidation of aniline in a water/isopropanol mixture

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Aleksandra Rakić ◽  
Marija Vukomanović ◽  
Gordana Ćirić-Marjanović
Keyword(s):  
Molecular Structure ◽  
Reaction Medium ◽  
Enthalpy Of Mixing ◽  
Conductivity Measurements ◽  
Reaction Conditions ◽  
Electron Microscopies ◽  
Ammonium Peroxydisulfate ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Free Oxidation

AbstractNanostructured polyaniline (PANI) was synthesised by the oxidation of aniline in a water/ isopropanol (propan-2-ol, IPA) (50 vol. %) mixture, without added acid, using ammonium peroxydisulfate (APS) as an oxidant. Influence of the IPA co-solvent and the reaction time on the molecular structure, morphology and properties of synthesised PANI samples was studied by FTIR, Raman, and UV-VIS spectroscopies, scanning and transmission electron microscopies (SEM and TEM), and conductivity measurements. The course of the reaction was followed by monitoring changes in the temperature and acidity of the reaction medium. The results were compared with those obtained for PANI prepared in water without IPA under the same reaction conditions. The importance of the solvation effects, dielectric constant of the solvent, and the enthalpy of mixing of IPA with water on the course of the polymerisation reaction and on the properties of polymeric products in the water/IPA medium in comparison with those in water was pointed out.

Cu catalyzed oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran and 2,5-furandicarboxylic acid under benign reaction conditions

2013 ◽  
Vol 456 ◽  
pp. 44-50 ◽  
Author(s):  
Thomas S. Hansen ◽  
Irantzu Sádaba ◽  
Eduardo J. García-Suárez ◽  
Anders Riisager
Keyword(s):  
Reaction Conditions ◽  
Furandicarboxylic Acid ◽  
Catalyzed Oxidation

A Novel NiCl2-CuCl2/HMOR Catalyst for Direct Vapor-Phase Carbonylation of Methanol

2013 ◽  
Vol 316-317 ◽  
pp. 983-986 ◽  
Author(s):  
Hai Xia Wang ◽  
Wen Wen Guo ◽  
Ling Jun Zhu
Keyword(s):  
High Activity ◽  
Methyl Iodide ◽  
Vapor Phase ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Composite Catalyst ◽  
Reaction Conditions ◽  
Reaction Pressure ◽  
Methanol Carbonylation ◽  
Optimum Reaction

Direct vapor-phase methanol carbonylation, without any methyl iodide in the feed as a promoter, was carried out over NiCl2-CuCl2/HMOR catalysts. The results showed that NiCl2-CuCl2/HMOR catalysts exhibited high activity for methanol carbonylation. The optimum component of the composite catalyst was 5wt% NiCl2 and 15wt% CuCl2. In addition, the effects of reaction pressure and temperature on catalytic performance of 5%NiCl2-15%CuCl2/HMOR catalyst were investigated. It was revealed that methanol conversion of 84.2% and carbonylation selectivity of 73.5% could be obtained under the optimum reaction conditions of P=1.5MPa and T=623K.

N-doped carbon supported Pt catalyst for base-free oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid

2016 ◽  
Vol 526 ◽  
pp. 1-8 ◽  
Author(s):  
Xuewang Han ◽  
Chaoqun Li ◽  
Yong Guo ◽  
Xiaohui Liu ◽  
Yongguang Zhang ◽  
...  
Keyword(s):  
Pt Catalyst ◽  
Furandicarboxylic Acid ◽  
Free Oxidation ◽  
Supported Pt Catalyst

Ruthenium Supported on High-Surface-Area Zirconia as an Efficient Catalyst for the Base-Free Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

ChemSusChem ◽  
2018 ◽  
Vol 11 (13) ◽  
pp. 2083-2090 ◽  
Author(s):  
Christian M. Pichler ◽  
Mohammad G. Al-Shaal ◽  
Dong Gu ◽  
Hrishikesh Joshi ◽  
Wirawan Ciptonugroho ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Efficient Catalyst ◽  
Furandicarboxylic Acid ◽  
Free Oxidation

One-Pot Synthesis of 2-Substituted Benzoxazoles Directly from Carboxylic Acids

2008 ◽  
Vol 61 (11) ◽  
pp. 881 ◽  
Author(s):  
Dinesh Kumar ◽  
Santosh Rudrawar ◽  
Asit K. Chakraborti
Keyword(s):  
Carboxylic Acids ◽  
Methanesulfonic Acid ◽  
Acid Chlorides ◽  
Double Bonds ◽  
Reaction Conditions ◽  
One Pot ◽  
Effective Catalyst ◽  
One Pot Synthesis ◽  
Highly Effective

Methanesulfonic acid has been found to be a highly effective catalyst for a convenient and one-pot synthesis of 2-substituted benzoxazoles by the reaction of 2-aminophenol with acid chlorides, generated in situ from carboxylic acids. Aryl, heteroaryl, and arylalkyl carboxylic acids provided excellent yields of the corresponding benzoxazoles. The reaction conditions were compatible with various substituents such as chloro, bromo, nitro, methoxy, cyclopentyloxy, phenoxy, thiophenoxy, and conjugated double bonds. Benzoxazole formation was found to be general with respect to substituted 2-aminophenols.

scholarly journals Aerobic Epoxidation of Low-Molecular-Weight and Polymeric Olefins by a Supramolecular Manganese Porphyrin Catalyst

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 195 ◽  
Author(s):  
Ivan Bernar ◽  
Floris Rutjes ◽  
Johannes Elemans ◽  
Roeland Nolte
Keyword(s):  
Molecular Weight ◽  
Ambient Temperature ◽  
High Activity ◽  
Molecular Oxygen ◽  
Low Molecular Weight ◽  
Mechanistic Studies ◽  
Manganese Porphyrin ◽  
Reaction Conditions ◽  
Porphyrin Complex ◽  
Epoxidation Reaction

We report on the highly efficient epoxidation of low-molecular-weight and polymeric olefins catalyzed by a supramolecular manganese porphyrin complex using molecular oxygen as an oxidant and an aldehyde as a co-reductant. At ambient temperature and under optimized reaction conditions, the catalyst showed high activity and stereoselectivity. The efficiency of the supramolecular manganese porphyrin was higher than that of a reference porphyrin catalyst, possibly because it was more stable under the applied reaction conditions. Mechanistic studies suggest that a manganese oxo porphyrin complex may be an intermediate in the epoxidation reaction.

PIFA-Mediated Oxidative Cyclization Reactions of α-Acyl Acrylamides: A Synthetic Route to Substituted Isoxazol-3(2H)-ones

Synthesis ◽  
2018 ◽  
Vol 50 (09) ◽  
pp. 1875-1882 ◽  
Author(s):  
Rui Zhang ◽  
Dewen Dong ◽  
Jingwen Yuan ◽  
Chitturi Rao ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Oxidative Cyclization ◽  
Metal Catalyst ◽  
Synthetic Route ◽  
Cyclization Reactions ◽  
Reaction Conditions ◽  
Catalyst Free ◽  
Free Oxidation

An intramolecular cyclization of various α-acyl β-amino acrylamides in the presence of PIFA and TFA is described. This transformation features mild reaction conditions, simple execution, high chemo­selectivity, and metal catalyst-free oxidation, and thereby, provides not only an alternative protocol for the construction of N–O bond, but also an efficient and straightforward synthesis of substituted isoxazol-3(2H)-ones from readily available α-acyl acrylamides.

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