Category: 931-40-8

Application of 931-40-8. 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 Nanodiscs and mass spectrometry: Making membranes fly. Author is Marty, Michael T..

Cells are surrounded by a protective lipid bilayer membrane, and membrane proteins in the bilayer control the flow of chems., information, and energy across this barrier. Many therapeutics target membrane proteins, and some directly target the lipid membrane itself. However, interactions within biol. membranes are challenging to study due to their heterogeneity and insolubility Mass spectrometry (MS) has become a powerful technique for studying membrane proteins, especially how membrane proteins interact with their surrounding lipid environment. Although detergent micelles are the most common membrane mimetic, nanodiscs are emerging as a promising platform for MS. Nanodiscs, nanoscale lipid bilayers encircled by two scaffold proteins, provide a controllable lipid bilayer for solubilizing membrane proteins. This Young Scientist Perspective focuses on native MS of intact nanodiscs and highlights the unique experiments enabled by making membranes fly, including studying membrane protein-lipid interactions and exploring the specificity of fragile transmembrane peptide complexes. It will also explore current challenges and future perspectives for interfacing nanodiscs with MS.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Nguyen-Phu, Huy; Do, Lien Thi; Shin, Eun Woo published the article 《Investigation of glycerolysis of urea over various ZnMeO (Me = Co, Cr, and Fe) mixed oxide catalysts》. Keywords: glycerolysis urea zinc cobalt chromium iron oxide catalyst.They researched the compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one( cas:931-40-8 ).Product Details 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.

In this study, we investigated the glycerolysis of urea over various ZnMeO (Me = Co, Cr, and Fe) mixed oxide catalysts. ZnMeO mixed oxide catalysts were prepared by a co-precipitation method for two Zn/Me ratios, resulting in Zn-rich mixed oxide (Zn2MeO) and Zn-poor mixed oxide (ZnMe2O). In the glycerolysis of urea, the Zn2MeO catalysts exhibited higher glycerol conversion and glycerol carbonate yields than the ZnMe2O catalysts due to the predominance of homogeneous catalysis through Zn isocyanate (NCO) complexes from the Zn2MeO catalysts. Specifically, Zn2CrO was the best catalyst, with the highest yield of glycerol carbonate. Fourier transform IR (FT-IR) and thermogravimetric anal. (TGA) results of the spent catalysts clearly demonstrated the dominant formation of a solid Zn NCO complex over the spent Zn2CrO catalyst, a unique feature indicating that the better catalytic performance of Zn2CrO was due to the addnl. heterogeneous reaction route through the solid Zn NCO complex.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about A Polymer-Reinforced SEI Layer Induced by a Cyclic Carbonate-Based Polymer Electrolyte Boosting 4.45 V LiCoO2/Li Metal Batteries, the main research direction is solid electrolyte interphase carbonate polymer electrolyte battery; cobalt lithium oxide battery solid electrolyte battery; lithium metal batteries; polymer electrolytes; polymer matrixes; solid electrolyte interphase (SEI) layers.Product Details of 931-40-8.

Lithium (Li) metal batteries (LMBs) are enjoying a renaissance due to the high energy densities. However, they still suffer from the problem of uncontrollable Li dendrite and pulverization caused by continuous cracking of solid electrolyte interphase (SEI) layers. To address these issues, developing spontaneously built robust polymer-reinforced SEI layers during electrochem. conditioning can be a simple yet effective solution Herein, a robust homopolymer of cyclic carbonate urethane methacrylate is presented as the polymer matrix through an in situ polymerization method, in which cyclic carbonate units can participate in building a stable polymer-integrated SEI layer during cycling. The as-investigated gel polymer electrolyte (GPE) assembled LiCoO2/Li metal batteries exhibit a fantastic cyclability with a capacity retention of 92% after 200 cycles at 0.5 C (1 C = 180 mAh g-1), evidently exceeding that of the counterpart using liquid electrolytes. It is noted that the anionic ring-opening polymerization of the cyclic carbonate units on the polymer close to the Li metal anodes enables a mech. reinforced SEI layer, thus rendering excellent compatibility with Li anodes. The in situ formed polymer-reinforced SEI layers afford a splendid strategy for developing high voltage resistant GPEs compatible with Li metal anodes toward high energy LMBs.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Application of polyethylene separator modified by methyl acrylic polymer in lithium ion battery, the main research direction is polyethylene separator methyl acrylic polymer lithium ion battery.Computed Properties of C4H6O4.

Cyclic carbonate group was introduced into the side-chain of polymethyl methacrylate (PMMA) to prepare poly(2-oxo-1,3-dioxolan-4-yl) Me methacrylate (PDOMMA), which was then coated on polyethylene separator of lithium ion battery. The thermal stability of PDOMMA and the effect of modification on wettability and electrolyte uptake ability of separator were studied by thermogravimetry (TG), differential scanning calorimetry (DSC), static contact angle test and electrolyte uptake rate test. Moreover, the effect of the modified separator on the performance of lithium ion battery was studied by galvanostatic charge and discharge test, a.c. (AC) impedance test, rate capability test and SEM (SEM). The results show that compared to the unmodified separator, the modified separator has an improved wettability with the electrolyte (the complete wetting is reached by 20 s), a higher uptake rate of electrolyte (440%), and better cycle performance of the related battery (discharge specific capacity increased by 12.3%).

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Name: 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 Heterogeneous synthesis of glycerol carbonate from glycerol and dimethyl carbonate catalyzed by LiCl/CaO. Author is Tang, Ying; Xue, Yu Ying; Li, Zhaoyi; Yan, Tianlan; Zhou, Rui; Zhang, Zhiping.

In this article, a CaO-based catalyst was prepared by impregnating chloride salts on CaO to develop a highly efficient heterogeneous catalyst for the synthesis of glycerol carbonate (GC) from glycerol and di-Me carbonate. LiCl/CaO exhibited a high catalytic activity under moderate reaction conditions. The effects of the LiCl loadings, the amount of catalyst and the calcination temperature on the catalytic activity were investigated. The highest yield of 94.19% glycerol carbonate was obtained at 65°C on CaO loaded with 10% LiCl after 1 h, and the catalyst had high stability in reusing work. SEM (SEM), X-ray diffraction (XRD), BET, CO2-TPD, XPS and thermalgravity (TG) were used to characterize the prepared catalyst. It was found that the high catalytic activity of CaO after modification with LiCl is associated with the structural aspects and the amount of basicity of the catalyst. The Li2O2 species, which is a strong basic site that is formed by the substitution of the Ca2+ in CaO lattice by Li+, has great activity for transesterification.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

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, Liaoning Huagong called Preparation of catalyst from natural eggshell waste and its application in the synthesis of glycerol carbonate, Author is Wang, Sun-bo; Wang, Song; Li, San-xi, the main research direction is transesterification catalyst eggshell glycerol dimethyl carbonate dioxolanone preparation.Safety of 4-(Hydroxymethyl)-1,3-dioxolan-2-one.

Eggshell is a kind of waste with huge production Its main component is calcium carbonate, which can be used as the source of base catalyst, calcium oxide. Turning egg shell waste into base catalyst can turn waste into useful material and is in line with the concept of green chem. In this paper, the catalyst was prepared from waste egg shell, and its application in the synthesis of glycerol carbonate was explored. The property of prepared catalyst was investigated by FTIR, XRD, SEM and EDS. The investigation results indicated that the catalyst prepared from waste eggshells through adding dolomite and talcum powder by calcined at 1250°C for 4 h showed high catalytic ability. The prepared catalyst can be used in the synthesis of glycerol carbonate and has good activity. The optimal conditions for the synthesis of glycerol carbonate were determined as follows: the catalyst amount 5% (wt), the molar ratio of DMC to glycerol 3:1, the reaction temperature 80°C and the reaction time 2 h. Under above conditions, glycerol conversion rate reached 94.67%. However, the stability of the catalyst in the transesterification reaction is poor.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

HPLC of Formula: 931-40-8. 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: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about The role of impurities in the La2O3 catalyzed carboxylation of crude glycerol. Author is Razali, N. A.; Conte, M.; McGregor, J..

The direct carboxylation of crude glycerol, obtained as a byproduct of bio-diesel synthesis, with CO2 has been investigated over lanthanum oxide as a heterogeneous catalyst for the first time. Adiponitrile is employed as a dehydrating agent in order to shift the reaction equilibrium to the product side. The selectivity of the reaction towards glycerol carbonate when using crude glycerol is significantly reduced as compared to employing refined glycerol: 2.3% cf. 17% resp. Glycerol conversion, however remains approx. constant: 54% cf. 58%. In order to understand the role of the impurities present in crude glycerol, model systems consisting of refined glycerol and one or more of water, methanol, Me palmitate (as a model fatty acid Me ester), and sodium methoxide have been prepared and used as reaction media to systematically evaluate their effect. All of these impurities are seen to reduce the selectivity towards glycerol carbonate, instead favoring the formation of 4-(hydroxymethyl)oxazolidin-2-one, with the exception of methanol where no detrimental effect is observed and the measured selectivity increases slightly to ca. 22%. This effect is ascribed, in part, to improved mass transfer as a consequence of an increased solubility of carbon dioxide in the liquid media when methanol is present. Addnl., adiponitrile is observed to play a crucial role in the reaction mechanism beyond its simple role as a dehydrating agent. These results provide insights into the required purification steps for crude glycerol, and suggest the possibility of employing crude glycerol directly, and its use as a chem. feedstock; in both cases by minimizing costly separation and purification steps.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Recent development of heterogeneous catalysis in the transesterification of glycerol to glycerol carbonate, the main research direction is review glycerol carbonate heterogeneous catalysis transesterification.COA of Formula: C4H6O4.

A review. Glycerol is one of the most crucial byproducts in the production of biodiesel, and owing to its oversaturation in the market, several synthetic strategies have been developed to transform it into other higher value-added products such as glycerol carbonate, epichlorohydrin, 1,3-propanediol, etc. Amongst them, glycerol carbonate is considered to be the most valuable product. Considering the facile separation and reusability of catalyst, heterogeneous base catalysts have attracted considerable attention due to the obvious advantages over Bronsted acid and homogeneous base catalysts in the transesterification of glycerol. Herein, we will give a short overview on the recent development of the heterogeneous catalysis in the transesterification of glycerol with dialkyl carbonate. Focus will be concentrated on the heterogeneous base catalysts including alk.-earth metal oxides (MgO, CaO, and mixed oxides), hydrotalcites, zeolites, clinoptilolites, organic bases, etc. Their catalytic mechanisms during the heterogeneous process will be elucidated in detail.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

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, Materials Today Communications called Feasibility of polyamines and cyclic carbonate terminated prepolymers in polyurethane/polyhydroxyurethane synthesis, Author is Kotanen, Soilikki; Laaksonen, Timo; Sarlin, Essi, the main research direction is cyclic carbonate terminated prepolymer polyurethane polyhydroxyurethane polyamine.Computed Properties of C4H6O4.

Polyurethanes are a well-established part of adhesive markets. However due to the toxicity of di-isocyanates used in the synthesis, finding an alternative route to synthesize polyurethanes is increasingly important. One strategy is to use cyclic carbonate terminated prepolymers with polyamines to yield polyhydroxyurethanes. This research highlights the possibility to use com. available polyurethane prepolymers with different isocyanate chemistries for cyclic carbonate terminated prepolymer synthesis with the help of glycerol carbonate and a catalyst. These synthesized prepolymers were used in a screening study with different com. available low toxic amines. It was observed that when secondary amines were used, the reaction advanced at room temperature with no further heating required. The development of lap shear strength over time on stainless steel, gel content, tensile strength and elongation were measured from room temperature cured polymers. The synthesized polyurethane/polyhydroxyurethane (PU/PHU) hybrid materials had high initial lap shear strength close to current industrial polyurethane adhesives. The strength development over time was negligible. Full conversions were seen within one month from the reaction. Tensile strength levels were slightly lower than typical industrial polyurethane adhesives. Even though the lap shear strength results and gel contents at room temperature were on a good level, curing at elevated temperature had a pos. impact on them. The best performing combination was cyclic carbonate functionalized hexamethylene di-isocyanate prepolymer with multifunctional polyethyleneimine amine. In short, di-isocyanate free PU/PHU hybrid materials were successfully synthesized from com. raw materials and their performance was comparable with current industrial polyurethane adhesives.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about One-Pot Multiple-Step Integration Strategy for Efficient Fixation of CO2 into Chain Carbonates by Azolide Anions Poly(ionic liquid)s, the main research direction is fixation CO2 chain carbonate azolide anion polyionic liquid.Application of 931-40-8.

The multiple-step transformation of CO2 greatly enriches the diversity and value of products and provides more possibilities for the sustainable development of green chem. However, it puts forward stricter requirements for the versatility of catalysts. A series of basic porous ionic polymers incorporating azolide anions (BA-PILs) were facilely synthesized via radical polymerization followed by a successive ion-exchange strategy. A one-pot multiple-step integration strategy coupling cycloaddition and transesterification were explored to synthesize chain carbonates without the separation of intermediate products. High catalytic activity, stable recyclability, and chain carbonate compatibility were achieved in the absence of any cocatalyst. Combined with catalysts’ characterization, in situ IR anal., and d. functional theory (DFT) calculation of BA-PILs rationally explained the dual roles of azolide anions in the one-pot synthesis. The construction of functional BA-PILs as a versatile platform provides an original idea for the efficient insertion of CO2 into chain carbonates.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare