Category: 931-40-8

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Photo-thermal synergistically catalytic conversion of glycerol and carbon dioxide to glycerol carbonate over Au/ZnWO4-ZnO catalysts.COA of Formula: C4H6O4.

Converting glycerol and CO2 into glycerol carbonate offers a green pathway for utilizing biodiesel byproduct glycerol and greenhouse gas CO2 as well as synthesizing the important chem. compound glycerol carbonate. In this study, for the first time, the abundant visible light was introduced into thermal-driven glycerol carbonylation system, aiming to improve catalyst performance via breaking the thermodn. equilibrium limitations. Here x%Au/ZnWO4-ZnO catalysts were designed for the photo-thermal catalytic system. It was found that, ZnWO4-ZnO itself was effective in glycerol carbonylation even under thermal-driven condition, and the loading of plasmonic Au further enhanced the catalytic performances especially with visible light irradiation The visible light responsivity of the catalysts and reaction temperatures played important roles for the photo-thermal performance of x%Au/ZnWO4-ZnO, indicating the strong photo-thermal synergistic effect for the highly promoted catalytic performance. This study suggests the photo-thermal synergistic catalysis is one of efficient approaches for further improving catalytic performance.

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Recommanded Product: 4-(Hydroxymethyl)-1,3-dioxolan-2-one. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Self-healing and flexible carbon nanotube/polyurethane composite for efficient electromagnetic interference shielding. Author is Wang, Ting; Yu, Wan-Cheng; Zhou, Chang-Ge; Sun, Wen-Jin; Zhang, Yun-Peng; Jia, Li-Chuan; Gao, Jie-Feng; Dai, Kun; Yan, Ding-Xiang; Li, Zhong-Ming.

Electromagnetic interference (EMI) shielding composites are inevitably damaged in the long-term usage which would affect the regular operation of the devices. Hence, the demand for materials with healable and reliable EMI shielding performance has increased. Here, a flexible conductive composite owning both self-healing and EMI shielding functions is facilely developed, with carbon nanotubes (CNTs) as conductive filler and dynamically crosslinked polyurethane bearing Diels-Alder bonds (PUDA) as polymer matrix. The PUDA/CNT composite shows a high EMI shielding effectiveness (EMI SE) of 30.7 dB at 5.0 wt% CNT loading in the range of X-band (8.2-12.4 GHz). And the EMI SE can recover from 16.8 dB for damaged state to 29.8 dB after three times cut/healing cycles, revealing excellent EMI SE retention of 97.1%. The PUDA/CNT composite also exhibits healable tensile properties with an elongation at break up to 571% ± 31% at 2.0 wt% CNT content and self-healing efficiency of 89.2% after the repeatable healing. This work demonstrates a healable EMI shielding composite, which ensures the reliability and long-time use under harsh conditions.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

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 Morphology-Controlled Synthesis of Three-Dimensional Hierarchical Flowerlike Mg-Al Layered Double Hydroxides with Enhanced Catalytic Activity for Transesterification, published in 2019-05-15, which mentions a compound: 931-40-8, Name is 4-(Hydroxymethyl)-1,3-dioxolan-2-one, Molecular C4H6O4, Recommanded Product: 931-40-8.

With the aim of simultaneously achieving synthesis and morphol. control of three-dimensional (3D) hierarchical layered double hydroxide (LDH) by more efficient and environmentally friendly methods, a facile and cost-efficient double-drop coprecipitation method was creatively applied to fabricate 3D flowerlike microstructures (Al2O3-MgAl-LDHs) using γ-Al2O3 as a sacrificial template. The morphol. evolution process and growth characteristics of Al2O3-MgAl-LDHs were investigated in detail, revealing that γ-Al2O3 not only provides an effective support for the crystal growth of LDH but also is involved in the LDH layer formation process through self-decomposition More importantly, LDH morphologies can be regulated by varying the reaction conditions, such as the γ-Al2O3 concentration, Mg2+/Al3+ molar rati o, and pH. Addnl., a possible formation mechanism for 3D hierarchical flowerlike Al2O3-MgAl-LDHs was illustrated. Remarkably, owing to the high sp. surface area and low/medium/high-strength basic sites, the as-obtained LDH after calcination exhibited excellent catalytic activity and reusability in the transesterification of glycerol with di-Me carbonate.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

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 Solar energy-controlled shape selective synthesis of zinc oxide nanomaterials and its catalytic application in synthesis of glycerol carbonate, published in 2021-03-31, which mentions a compound: 931-40-8, Name is 4-(Hydroxymethyl)-1,3-dioxolan-2-one, Molecular C4H6O4, Synthetic Route of C4H6O4.

In this study, we have synthesized shape selective zinc oxide (ZnO) nanoflower using solar energy and naturally accessible aromatic amino acids like tryptophan, tyrosine and phenylalanine as a photo capping agents. This synthesized material has been characterized by various characterization techniques such as XRD, FE-SEM, EDX, UV-Vis and FTIR. The ZnO nanoflower synthesized using solar energy and photo capping agents exhibited excellent catalytic activity after calcination for the synthesis of glycerol carbonate via urea glycerolysis as compared to the conventional process owing to its shape selective morphol. Further, high resolution XPS studies were performed to explore the valence states and effectiveness of surface engineering of the ZnO catalyst. Such a unique technique of ZnO nanoflowers synthesis represents a novel and environmentally benign route for synthesis of shape selective metal oxide nanoparticles as well as derived nanomaterial after calcination showed excellent activity and potential recyclability for the conversion of waste into valuable products. After calcination ZnO nanomaterials shows 67% yield in the synthesis of glycerol carbonate at 140°C in 4 h, at the end a catalytic reaction mechanism was proposed.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Multifunctional and Sustainable Fe-Iminopyridine Complexes for the Synthesis of Cyclic Carbonates.HPLC of Formula: 931-40-8.

The use of multifunctional and sustainable Fe catalysts for the formation of cyclic carbonates from epoxides and CO2 at 80° and 3 bar pressure is presented. The optimal catalyst possesses a halide counteranion and a H bond donor to activate the epoxide for ring opening, affording a single-component, cocatalyst-free catalytic system.

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Arora, Shivali; Gosu, Vijayalakshmi; Kumar, U. K. Arun; Subbaramaiah, Verraboina published the article 《Valorization of glycerol into glycerol carbonate using the stable heterogeneous catalyst of Li/MCM-41》. Keywords: lithium zeolite heterogeneous catalyst glycerol carbonate transesterification.They researched the compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one( cas:931-40-8 ).Application of 931-40-8. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:931-40-8) here.

The present study explored the catalytic activity of the heterogeneous catalyst for transesterification of glycerol into glycerol carbonate, a versatile compound Transesterification of glycerol was investigated with different active metals (Li, La, Ce, Mg, K) impregnated on MCM-41 (Mobil Composition of Matter Number 41) framework. Among these, lithium incorporated MCM-41 proved the better catalytic activity to toward the formation of glycerol carbonate. The shortening of a long-range hexagonal array was observed with active metal incorporation due to the accumulation of non-framework Li species in the MCM-41 structure. BET study revealed that Li/MCM-41 possess type IV hysteresis loop according to IUPAC standards The average pore diameter was increased from 25.43 Å to 62.02 Å with active metal incorporation in the MCM-41 framework. The catalytic activity of Li/MCM-41 was observed by varying different weight ratios of active metal and the calcination temperature The results demonstrated that 5 wt% Li impregnated on MCM-41, calcined at 450°C, appeared to have a maximum yield of glycerol carbonate. Addnl., the influence of reaction operating parameters was also investigated. The results showed that 99 ± 1.89% glycerol conversion and 93.14 ± 2.52% glycerol carbonate yield was achieved at di-Me carbonate-to-glycerol molar ratio of 3, catalyst dosage of 4 wt% (relative to glycerol mass) and a reaction temperature of 90°C in 3 h. The recyclability and stability of the screened catalyst was also studied under optimized conditions. The activation energy of the catalyst was determined by solving the differential equation using MATLAB ODE15s tool, and the obtained value was 53.77 ± 3.26 kJ/mol. The E-factor and PMI (Process mass intensity) values of glycerol carbonate synthesis were determined as 1.16 and 2.16, resp., which demonstrate the less waste generation during the process.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Category: chiral-catalyst. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Lithium Zirconate as a Selective and Cost-Effective Mixed Metal Oxide Catalyst for Glycerol Carbonate Production. Author is Kaur, Avneet; Ali, Amjad.

Alkali and alk. metal (Li, Na, K, Ca, and Mg)-loaded zirconium oxide catalysts were prepared by the wet impregnation method. All the prepared catalysts were employed as active heterogeneous catalysts for the transesterification of glycerol (GL) with di-Me carbonate (DMC) producing glycerol carbonate (GLC). The catalyst with 20 wt % loading of Li on ZrO2 showed a maximum catalytic activity with 100% selectivity toward GLC. The structure and basic properties of the prepared catalysts were studied by X-ray diffraction, high-resolution transmission electron microscopy, XPS, and CO2-temperature programmed desorption techniques. The effect of various reaction parameters like catalyst concentration, reaction temperature, and the molar ratio of reactants on the GLC yield was also studied. For the first time, the reaction product was quantified using the 1H NMR technique. Considering the less availability of the kinetic study of the transesterification of GL with DMC, kinetic parameters were also studied. The Li/ZrO2-catalyzed transesterification reaction appeared to follow second-order kinetics with an activation energy (Ea) of 93.7 kJ mol-1. Thermodn. parameters like enthalpy (ΔH), entropy (ΔS), and Gibbs free energy (ΔG) of the reaction were also determined

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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: 931-40-8, is researched, SMILESS is O=C1OCC(CO)O1, Molecular C4H6O4Journal, Article, Langmuir called Osmotic Swelling of Sodium Hectorite in Ternary Solvent Mixtures: Nematic Liquid Crystals in Hydrophobic Media, Author is Mayr, Lina; Amschler, Sonja; Edenharter, Andreas; Dudko, Volodymyr; Kunz, Raphael; Rosenfeldt, Sabine; Breu, Josef, the main research direction is osmotic swelling sodium hectorite; ternary solvent mixture nematic liquid crystal hydrophobic.SDS of cas: 931-40-8.

The swelling of clay minerals in organic solvents or solvent mixtures is key for the fabrication of polymer nanocomposites with perfectly dispersed filler that contain only individual clay layers. Here, we investigated the swelling behavior of sodium hectorite in different ternary solvent mixtures containing methanol, acetonitrile, ethylene glycol, or glycerol carbonate with minimal amounts of water. We found that in these mixtures, less water is required than in the corresponding binary mixtures to allow for complete delamination by repulsive osmotic swelling. A quant. study of osmotic swelling in a particular ternary mixture shows that organic solvents resemble swelling behavior in pure water. At hectorite contents larger than 5 vol %, the separation of individual layers scales with ϕ-1. At this concentration, a crossover is observed and swelling continues at a slower pace (ϕ-0.5) below this value.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one(SMILESS: O=C1OCC(CO)O1,cas:931-40-8) is researched.Synthetic Route of C6H7NO2. The article 《Reactive jojoba and castor oils-based cyclic carbonates for biobased polyhydroxyurethanes》 in relation to this compound, is published in European Polymer Journal. Let’s take a look at the latest research on this compound (cas:931-40-8).

Syntheses of novel biobased PolyHydroxyUrethane (PHU) have been performed from Jojoba and castor oil. Cyclic carbonate monomers with various functionality were synthesized from both jojoba and castor oils. Pendant cyclic carbonate groups were obtained by a two-step reaction: thiol-ene coupling with thioglycolic acid followed by esterification with glycerin carbonate. These novel cyclic carbonate monomers exhibited higher reactivity than previous intra-chain plant oil-based cyclic carbonates. Di-functional jojoba oil-based cyclic carbonate was synthesized for the first time. PHUs were obtained by aminolysis of plant oil-based cyclic carbonates with various aliphatic and aromatic diamines. Structured linear and crosslinked PHUs were obtained with Tg ranging from -45 to 20 °C. The different PHU materials were characterized by SEC, FTIR, DSC, ATG and DMA measurements. These results showed the potentiality of this environmentally friendly approach to prepare plant oils-based PHU materials with interesting performances.

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Chiral Catalysts,
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Synthetic Route of C4H6O4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Application of corncob residue-derived catalyst in the transesterification of glycerol with dimethyl carbonate to synthesize glycerol carbonate. Author is Wang, Song; Wang, Jianye; Okoye, Patrick U.; Chen, Shuang; Li, Xinshu; Duan, Lin; Zhou, Huan; Li, Sanxi; Tang, Tao; Zhang, Linnan; Zhang, Ailing.

Corncob was calcined within a temperature range of 300°C to 700°C to prepare a series of corncob residue catalysts for the transesterification of glycerol with di-Me carbonate (DMC) to synthesize glycerol carbonate (GC). Among the catalysts, the corncob residue catalyst obtained through calcination of corncob at 500°C (CCR-500) showed a relatively high basicity and satisfactory catalytic activity. The structural investigation results indicated that CCR-500 was composed of carbon material and some alk. mineral salts. Using CCR-500 as the catalyst, a glycerol conversion of 98.1% and a GC yield of 94.1% were achieved when the reaction was performed at 80°C for 90 min, with a catalyst amount of 3 wt% and glycerol to DMC molar ratio of 1:3. The comparison of CCR-500 with the reported catalysts indicated that the CCR-500 was a low-cost, high-active, and easily-accessible catalyst for the transesterification of glycerol with DMC.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare