Category: 814-94-8

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 814-94-8, is researched, SMILESS is O=C([O-])C([O-])=O.[Sn+2], Molecular C2O4SnJournal, Article, ChemSusChem called A Bronsted Acidic Ionic Liquid as an Efficient and Selective Catalyst System for Bioderived High Molecular Weight Poly(ethylene 2,5-furandicarboxylate), Author is Qu, Xiao-ling; Jiang, Min; Wang, Bing; Deng, Jin; Wang, Rui; Zhang, Qiang; Zhou, Guang-yuan; Tang, Jun, the main research direction is bronsted acidic ionic liquid catalyst bioderived polyethylene furandicarboxylate; ecofriendly bioderived polyester polyfuran ionic liquid catalyst green chem; Brønsted acids; biomass valorization; hydrogen bonding; ionic liquids; polymers.Product Details of 814-94-8.

Green synthesis of bioderived high-mol.-weight poly(ethylene 2,5-furandicarboxylate) (PEF) over metal-free catalysts is a significant challenge. This study focuses on PEF prepared from ethylene glycol and 2,5-furandicarboxylic acid (FDCA) through a direct esterification method with ecofriendly metal-free ionic liquids (ILs) as catalysts. The catalytic activities of a series of imidazolium cations in the presence of various anions are systematically investigated and found to be mainly governed by the anions. Among the ILs studied, 1-ethyl-3-methylimidazolium tetrafluoroborate ([C2MIM]BF4) is identified as the best catalyst, showing excellent catalytic activity, selectivity, and stability, even at low catalyst loadings (0.1 mol % w.r.t. FDCA). Optimization of the polymerization parameters enables [C2MIM]BF4-catalyzed production of PEF with a high number-average mol. weight (Mn=5.25×104 g mol-1). The relationship between Bronsted acidity and catalytic activity is also investigated and the results show that the trend in catalytic activity is in good agreement with that in Bronsted acidity, as determined by the Hammett method. Addnl., on the basis of exptl. results and d. functional theory calculations, an electrophilic activation mechanism induced by hydrogen bonds is proposed. This strategy of adjustable acidity and anion structure in ILs provides an opportunity to develop other ILs for bio-based polyesters through green synthesis pathways.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Production of palm-based glycol ester over solid acid catalysed esterification of lauric acid via microwave heating, published in 2020-02-15, which mentions a compound: 814-94-8, Name is Tin(II) oxalate, Molecular C2O4Sn, Application of 814-94-8.

This study involved in maximizing the conversion of lauric acid to glycol ester via esterification with diethylene glycol, aided by calcined Zn-Mg-Al catalyst in a 250-mL reactor using microwave heating. Preliminary catalytic screening involving three types of catalysts (tin (II) oxalate, Amberlyst-15 and calcined Zn-Mg-Al), resulted in the conversion of lauric acid obtained were 65.4%, 31.6% and 95.4% using tin (II) oxalate, Amberlyst-15 and calcined Zn-Mg-Al, resp. In addition, conversions obtained from the solid acid catalysts appeared to be higher than autocatalytic esterification of only 15.8%. The optimum operating condition for esterification via microwave heating was established at 190°C, 2:1.3 mol ratio of lauric acid to diethylene glycol with 5% of catalyst dosage at 90 min. Calcined Zn-Mg-Al catalyst under optimized condition gives 98.2% of lauric acid conversion. The recyclability of the catalysts in the esterification of lauric acid with diethylene glycol were also carried out. It shows that calcined Zn-Mg-Al and tin (II) oxalate both can be used for six cycles as compared to Amberlyst-15 catalyst that has lost part of its activity after the third cycle. The microwave heating remains attractive for heating catalytic esterification as it accelerates the reaction speed at shorten period of time from 8 h to 1.5 h as compared to conventional heating.

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Reference:
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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 814-94-8, is researched, SMILESS is O=C([O-])C([O-])=O.[Sn+2], Molecular C2O4SnJournal, Inorganic Chemistry Communications called Hetero-mixed TiO2-SnO2 interfaced nano-oxide catalyst with enhanced activity for selective oxidation of furfural to maleic acid, Author is Malibo, Petrus M.; Makgwane, Peter R.; Baker, Priscilla G. L., the main research direction is titanium tin nano oxide catalyst preparation oxidation furfural; maleic acid preparation.SDS of cas: 814-94-8.

Herein authors report on the catalytic activity of hetero-mixed TiO2-SnO2 nano-oxide catalyst for the selective liquid-phase oxidation of furfural to maleic acid using H2O2 oxidant. The high surface area and strong interaction of the two oxides with modified electronic structure manifested enhanced effective oxygen vacancies, and redox activity performance of the TiO2-SnO2 catalyst for furfural oxidation reaction. The structure of the catalyst was investigated by the powder x-ray diffraction (XRD), XPS, high-resolution transition electron microscopy (HRTEM), ESR (EPR) and Brunauer-Emmett-Teller (BET) surface area analyzer techniques. The interfaced TiO2-SnO2 oxide catalyst was more catalytically active than its single counterpart SnO2 and TiO2 oxides to give a furfural conversion of 96.2% at up to 63.8% yield of maleic acid. The catalytic performance shown by TiO2-SnO2 present encouraging prospects for an economical solid metal oxide catalyst to access biobased maleic acid from renewable biomass-derived furfural.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Product Details of 814-94-8. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Tin(II) oxalate, is researched, Molecular C2O4Sn, CAS is 814-94-8, about Template-assisted synthesis and electrochemical properties of SnO2 as a cathode catalyst support for PEMFC. Author is Chikunova, Iuliia O.; Semeykina, Victoriya S.; Kuznetsov, Aleksey N.; Kalinkin, Peter N.; Gribov, Evgueny N.; Parkhomchuk, Ekaterina V..

SnO2 is a promising material for electro- and photocatalysis sensors. In the electrocatalysis field, SnO2 is able to serve as a stable catalyst support for PEMFC cathodes. In this work, SnO2 were synthesized using SnCl4 or SnC2O4 and polystyrene microspheres as a template. The materials were characterized by XRD spectroscopy, CHNS anal., low temperature (77 K) N2 adsorption, mercury intrusion porosimetry (MIP) and SEM. The SnC2O4 decomposition resulted in obtaining SnO2 with high conductivity up to 0.275 S/cm according to impedance spectroscopy. The increase in aging time and PS loading improves SnO2 conductivity and stability. The potential cycling test in 1.0-1.5 V RHE range revealed that stability of the most stable SnO2 is higher than that of CB Ketjen Black EC-300J and comparable with that of Vulcan XC-72R. The ORR activities of Pt catalyst based on macroporous SnO2 showed values similar to those of Pt/SnO2 found in literature.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tin(II) oxalate( cas:814-94-8 ) is researched.Application In Synthesis of Tin(II) oxalate.Malibo, Petrus M.; Makgwane, Peter R.; Baker, Priscilla G. published the article 《Heterostructured Redox-Active V2O5/SnO2 Oxide Nanocatalyst for Aqueous-Phase Oxidation of Furfural to Renewable Maleic Acid》 about this compound( cas:814-94-8 ) in ChemistrySelect. Keywords: maleic acid furfural oxidation vanadium pentoxide tin oxide nanocatalyst. Let’s learn more about this compound (cas:814-94-8).

In this paper, we report on the synthesis of heterostructured V2O5/SnO2 nanocatalysts with varying vanadium metal loadings of 5-30 wt %. The catalytic performance of the designed catalysts was evaluated in the oxidation reaction of furfural to maleic acid using hydrogen peroxide. The synthesis method afforded highly dispersed nanosized VOx species with predominant exposed V5+ and V4+ on SnO2 oxide. Such structural interface developments of the heterostructured V2O5/SnO2 catalyst resulted into modified electronic structure; phase compositions and textural properties of the individual V and Sn metal oxides with respect to varying V-metal loadings, which lead to improved catalytic performances. Under optimized reaction conditions, a 60% yield of maleic acid was achieved in furfural oxidation reaction. Based on characterization results, the high surface area and low V-metal loading (∼9.3 wt % vanadium) presented the most redox active V2O5/SnO2 catalyst. At low V-metal loadings the catalyst is populated with the presence of VOx monomeric and polymeric species which are proposed to induce the highly active vanadium sites. This was confirmed for the most active catalyst to possess vanadium with the predominant V4+ state and superoxide oxygen. The catalytic performance showed by V2O5/SnO2 present a solid catalyst derived from earth-abundant and cheap metals for the catalytic oxidation upgrade of biomass typical furfural to important value-added maleic acid intermediate chem.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Safety of Tin(II) oxalate. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Tin(II) oxalate, is researched, Molecular C2O4Sn, CAS is 814-94-8, about Spray-combustion synthesis of indium tin oxide nanopowder. Author is Chen, Zhiyang; Zhu, Yuan; Duan, Qiyao; Chen, Anqi; Tang, Zikang.

Nanocrystalline indium tin oxide (ITO) powders were prepared by a novel spray combustion method. Using single-drop study equipment, we studied the thermodn. of the combustion reaction. The reaction can be ignited at air temperature as lower as 171.3° when using urea and glucose as composite fuel. Once the reaction is ignited, the combustion temperature can surge to >500°, generating nanocrystalline ITO powders with grain size ∼40 nm. Footages from high-speed camera demonstrated that the reaction is in 3 steps: moderate beginning, violent middle, and decaying end. The ignition is very sensitive to the air temperature, even 0.2° minus deviation may fail the combustion. The combustion reaction is self-sustainable, which saves the energy supply. The low ignition temperature means the combustion reaction can be carried out in a conventional spray dryer. Our results provide a feasible way to mass produce nanocrystalline ITO powders, which as a methodol., may be extended to the production of other oxide nanopowders.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Tin(II) oxalate(SMILESS: O=C([O-])C([O-])=O.[Sn+2],cas:814-94-8) is researched.Synthetic Route of C13H8CuF3N2. The article 《Synthesis of Tin oxide/sponge carbon composite as anode material for lithium-ion battery》 in relation to this compound, is published in Journal of Nanoscience and Nanotechnology. Let’s take a look at the latest research on this compound (cas:814-94-8).

Tin oxide/sponge carbon composite (SnO2/C) is synthesized by solvothermal reaction. The expected electrode materials are characterized by X-ray diffraction (XRD), SEM (SEM) and Raman spectrum. Related electrochem. properties are carried out by battery comprehensive testing system. The composite could remain its specific capacity at 660.5 mAh g-1 after 200 cycles and behaved superior rate performance. The exptl. results show that SnO2/C composite not only owned improved conductivity but also stable frame structure during lithiation/delithiation processes. So SnO2/C composite behaved higher reversible specific capacity and rate performance than those of pure SnO2 or SnC2O4. Based on its outstanding electrochem. performances, the SnO2/C anode electrode is a hopeful candidate for future application in lithium ion battery system.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Enhancing Reaction Kinetics of Sulfur-Containing Species in Li-S Batteries by Quantum Dot-Level Tin Oxide Hydroxide Catalysts, published in 2021-05-24, which mentions a compound: 814-94-8, mainly applied to reaction kinetic sulfur lithium battery quantum dot catalyst, COA of Formula: C2O4Sn.

The application of Li-S batteries is hampered by some unresolved issues, including the severe polysulfides shuttle effects and sluggish reaction kinetics. Hence, we designed and prepared tin oxide hydroxide quantum dots (TOH) anchored on a honeycomb porous carbon (HPC) matrix as multifunctional sulfur hosts, and deeply studied the enhancement of TOH on the reaction kinetics of Li-S battery referred to as the apparent activation energy, Li+ ion diffusion coefficient, and reaction barrier. It is proved by d. functional theory that the HPC@TOH hosts have a higher binding energy to polysulfides than the simplex carbon matrix. Meanwhile, the catalytic TOH can decrease the surface active energy of the redox reaction and accelerate the conversion of sulfur-containing species. Consequently, by means of the synergistic effects of phys. capture and chem. adsorption together with catalytic conversion, the comprehensive performances of Li-S batteries are distinctly promoted. In particular, a Li-S battery using HPC@TOH as a host delivers a good reversible specific capacity of 1342.95 mAh g-1 at 0.1 C. Moreover, with the current increased to 1 C, it shows a relatively satisfactory specific capacity of 918.05 mAh g-1. After 400 cycles, a competitive specific capacity of 688.54 mAh g-1 can still be maintained with a very low fading rate of 0.06% per cycle. Most importantly, when the sulfur area loading reaches as high as 4.25 mg cm-2 and electrolyte/sulfur ratio is controlled to be as low as 7μL mg-1, and the Li-S battery using HPC @TOH as a host can still cycle steadily more than 50 cycles at 0.2 C. Therefore, this work provides an effective manner to boost the comprehensive performance of Li-S batteries by virtue of optimizing and designing the host material with synergistic effects of phys. capture, chem. adsorption, and catalytic conversion.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 814-94-8, is researched, Molecular C2O4Sn, about Unique N doped Sn3O4 nanosheets as an efficient and stable photocatalyst for hydrogen generation under sunlight, the main research direction is nitrogen tin oxide photocatalytic activity surface particle morphol.Name: Tin(II) oxalate.

Unique N doped Sn3O4 nanosheets have been demonstrated successfully using a facile hydrothermal method. Investigations of the triclinic phase and the impurities were performed using powder X-ray diffraction anal. (XRD) and Raman spectroscopy. The morphol. anal. demonstrated a rectangular intra- and inter-connected nanosheet-like structure. The length of the nanosheets was observed to be in the range of 200-300 nm and the thickness of the nanosheets was less than 10 nm. The optical study reveals an extended absorption edge into the visible region, owing to the incorporation of nitrogen into the lattice of Sn3O4, which was further confirmed using XPS. Considering the band structure in the visible region, the photocatalytic activities of pristine and N doped Sn3O4 nanosheets for hydrogen evolution from water under natural sunlight were investigated. 4% N-Sn3O4 showed a higher photocatalytic activity (654.33μmol-1 h-1 0.1 g-1) for hydrogen production that was eight times that of pristine Sn3O4. The enhanced photocatalytic activity is attributed to the inhibition of charge carrier separation owing to the N doping, morphol. and crystallinity of the N-Sn3O4 nanostructures. A stable efficiency was observed for three cycles, which clearly shows the stability of N-Sn3O4.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Tin(II) oxalate, is researched, Molecular C2O4Sn, CAS is 814-94-8, about In-situ synthesis, thermal and mechanical properties of biobased poly(ethylene 2,5-furandicarboxylate)/montmorillonite (PEF/MMT) nanocomposites, the main research direction is polyethylene furandicarboxylate montmorillonite nanocomposite synthesis thermal mech property.Related Products of 814-94-8.

Poly(ethylene 2,5-furandicarboxylate) (PEF) is an emerging biobased polyester well-known for high gas barrier properties as well as high tensile modulus and strength, but PEF modification is still desired to improve its crystallization rate, toughness and even strength. In this study, PEF/Montmorillonite (MMT) nanocomposites were in-situ synthesized via melt polycondensation of di-Me furandicarboxylate and ethylene glycol in the presence of a com. available organically modified montmorillonite (OMMT), i.e., DK2, a montmorillonite clay modified with octadecyl hydroxyethyl di-Me ammonium. The structure of nanocomposites was characterized by ATR-FTIR, 1H NMR, WAXD and TEM, and their thermal and mech. properties were assessed with DSC, TGA and tensile test. The OMMT was grafted with PEF chains and therefore exfoliated, at least partially, in the PEF matrix with intrinsic viscosity over 0.7 dL/g. With respect to pristine PEF, the nanocomposites containing 2.5 wt% DK2 showed significantly improved melt crystallization, tensile modulus and strength.

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