Tag: M.W=100-200

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1116-77-4, Name is 4,4-Diethoxy-N,N-dimethyl-1-butanamine, molecular formula is C10H23NO2. In an article, author is Kwon, Woong,once mentioned of 1116-77-4, Application In Synthesis of 4,4-Diethoxy-N,N-dimethyl-1-butanamine.

Comparative Study on Toughening Effect of PTS and PTK in Various Epoxy Resins

This study investigated the toughening effect of in situ polytriazoleketone (PTK) and polytriazolesulfone (PTS) toughening agent when applied to various epoxy resins, such as diglycidyl ether of bisphenol A (DGEBA), diglycidyl ether of bisphenol F (DGEBF), and triglycidyl p-aminophenol (TGAP) with 3,3 ‘-diaminodiphenylsulfone as a curing agent. The fracture toughness, tensile properties, and thermal properties of the prepared epoxy samples were evaluated and compared. When PTK was mixed with DGEBF, the fracture toughness was improved by 27% with 8.6% increased tensile strength compared to the untoughened DGEBF. When PTS was mixed with TGAP, the fracture toughness was improved by 51% without decreasing tensile properties compared to the untoughened TGAP. However, when PTK or PTS was mixed with other epoxy resins, the fracture toughness decreased or improved with decreasing tensile properties. This is attributed to the poor miscibility between the solid-state monomer of PTK (4,4 ‘-bis(propynyloxy)benzophenone (PBP)) or PTS (4,4 ‘-sulfonylbis(propynyloxy)benzene (SPB)) and the epoxy resin, resulting in the polymerization of low molecular weight PTK or PTS in epoxy resin. Therefore, the toughening effect of PTK or PTS can be maximized by the appropriate selection of epoxy resin based on the miscibility between PBP or SPB and the resin.

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Related Products of 578-57-4, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 578-57-4, Name is 1-Bromo-2-methoxybenzene, SMILES is COC1=CC=CC=C1Br, belongs to ethers-buliding-blocks compound. In a article, author is Wei, Shouhui, introduce new discover of the category.

Development and comprehensive HS-SPME/GC-MS analysis optimization, comparison, and evaluation of different cabbage cultivars (Brassica oleracea L. var. capitata L.) volatile components

Seven parameters of the headspace solid phase micro-extraction (HS-SPME) for extracting volatile compounds from cabbage were optimized comprehensively for the first time. A total of 75 volatiles were identified and quantified in 10 cabbage cultivars, mainly including aldehydes, hydrocarbons, esters, isothiocyanates, alcohols, ethers, nitriles and thiazoles. Dimethyl ether was the most abundant volatile. There were 24 volatiles with the odour activity values (OAVs) greater than 1 making large contributions to the cabbage flavor. Pungent aroma was the strongest odour, followed by green and fruity aromas. In short, the overall OAV of purple cabbages were generally higher than that of green cabbage. The volatile profile of 10 cabbage cultivars could be distinguished on the basis of radar fingerprint chart (RFC), hierarchical cluster analysis (HCA) and principal component analysis (PCA). Therefore, this study not only developed a feasible method to distinguish different cabbage cultivars, but also established a theoretical basis for the genetic improvement of cabbage flavor.

Related Products of 578-57-4, Because enzymes can increase reaction rates by enormous factors and tend to be very specific, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 578-57-4.

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 10272-07-8, Name is 3,5-Dimethoxyaniline, molecular formula is C8H11NO2. In an article, author is Liu, Shasha,once mentioned of 10272-07-8, Formula: C8H11NO2.

The effect of carbon structure in chars on Fe migration and its catalytic activity for benzyl phenyl ether decomposition

This study aims to further understand the effect of carbon structure on the physiochemical status of metals and thus its activity during volatile-char interactions. The chars with distinctly different carbon substrates prepared from the pyrolysis of pine sawdust at 400 and 1000 degrees C were impregnated by different Fe contents, which were used as catalysts for benzyl phenyl ether (BPE, a typical lignin dimer) decomposition. The results demonstrated that the conversion of BPE was prominently improved with the iron addition, especially when the char prepared at the high temperature was loaded with 10% and 20% iron. The difference in carbon structure of two original chars have clearly resulted in the co-existence of various FexOy in chars at 400 degrees C and the dominant presence of alpha-Fe2O3 in chars at 1000 degrees C. Together with the Fe-containing active sites, the high orientation of carbon structure in the char from 1000 degrees C has considerably favored the high selectivity of product formation during the catalytic reforming of BPE and its derived volatile components.

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Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 645-36-3, Name is 2,2-Diethoxyethanamine, molecular formula is C6H15NO2. In an article, author is Lagoutte-Renosi, Jennifer,once mentioned of 645-36-3, Application In Synthesis of 2,2-Diethoxyethanamine.

Influence of Antiplatelet Agents on the Lipid Composition of Platelet Plasma Membrane: A Lipidomics Approach with Ticagrelor and Its Active Metabolite

Lipids contained in the plasma membrane of platelets play an important role in platelet function. Modifications in the lipid composition can fluidify or rigidify the environment around embedded receptors, in order to facilitate the access of the receptor by the drug. However, data concerning the lipid composition of platelet plasma membrane need to be updated. In addition, data on the impact of drugs on plasma membrane composition, in particular antiplatelet agents, remain sparse. After isolation of platelet plasma membrane, we assessed, using lipidomics, the effect of ticagrelor, a P2Y12 antagonist, and its active metabolite on the lipid composition of these plasma membranes. We describe the exact lipid composition of plasma membrane, including all sub-species. Ticagrelor and its active metabolite significantly increased cholesterol and phosphatidylcholine ether with short saturated acyl chains 16:0/16:0, and decreased phosphatidylcholine, suggesting overall rigidification of the membrane. Furthermore, ticagrelor and its active metabolite decreased some arachidonylated plasmalogens, suggesting a decrease in availability of arachidonic acid from the membrane phospholipids for synthesis of biologically active mediators. To conclude, ticagrelor and its active metabolite seem to influence the lipid environment of receptors embedded in the lipid bilayer and modify the behavior of the plasma membrane.

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Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 707-07-3, Name is (Trimethoxymethyl)benzene, SMILES is COC(OC)(C1=CC=CC=C1)OC, belongs to ethers-buliding-blocks compound. In a document, author is Liu, Di, introduce the new discover, Category: ethers-buliding-blocks.

Anion exchange membrane based on poly(arylene ether ketone) containing long alkyl densely quaternized carbazole derivative pendant

A series of poly(arylene ether ketone) copolymers (PAEK-HQACz-x) containing long alkyl densely quaternized carbazole derivative pendant was designed and synthesized for anion exchange membrane. It was found that constructing long alkyl chain between hydrophobic polymer backbone and hydrophilic densely functionalized hydrophilic pendant effective promoted the formation of well-defined microscopic phase separation morphology, in turn enabling high hydroxide conduction and confined dimensional variation. The PAEK-HQACz-0.7 membrane exhibited the hydroxide conductivity of 98.1 mS cm(-1) at 80 degrees C, while the swelling ratio was only 13.5%. The toughness and alkaline stability of PAEK-HQACz-x membranes were also significantly improved by attaching the long alkyl chain onto the quaternized carbazole derivative pendant. The PAEK-HQACz-0.7 membrane was selected for membrane electrode assembly and showed acceptable results. These properties demonstrated such membranes to be promising anion exchange membrane candidates.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 707-07-3 is helpful to your research. Category: ethers-buliding-blocks.

Related Products of 645-36-3, Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. 645-36-3, Name is 2,2-Diethoxyethanamine, SMILES is CCOC(OCC)CN, belongs to ethers-buliding-blocks compound. In a article, author is Garcia, Antonio, introduce new discover of the category.

Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

Recent investigations show that there are different combustion strategies that promise to achieve higher efficiencies in internal combustion engines. Advanced combustion modes such as reactivity controlled compression ignition (RCCI) and dual-mode dual-fuel (DMDF) have proven to be able to achieve low NOx and soot engine-out emissions while being able to operate over the complete engine map. On another front, intensive research has been done in the fuels field. Oxygenated fuels, like oxymethylene dimethyl ethers (OMEx) and methanol, are of special interest because of their potential to reduce the soot emissions, while allowing to adjust parameters, such as EGR, to higher values to also reduce NOx emissions and avoid other problems like excessive in-cylinder peaks of pressure. In this research, the effects of diesel-methanol and OMEx-gasoline fuels were studied on a dual-mode dual-fuel (DFDM) multi-cylinder engine at 1800 rpm for various loads (25, 50, 80 and 100%). To do so, a dedicated calibration to optimize the brake thermal efficiency while trying to maintain NOx and soot emissions under EURO VI limitations was applied. Then, the combustion characteristics, performance and emissions results are compared to a base diesel-gasoline case. Boundary conditions (intake pressure, temperature and air mass) for each fuel combination where similar, with the exception of the premixed energy ratio, which was on average 20% lower for diesel-methanol. Each fuel combination was, weighted against each other by means of an merit function, where the fuel combination with the lowest value has the closest approximation to ideal BSFCeq, BSNOx, BSSoot, BSCO and BSHC targets. Results show that diesel-methanol presents no significant differences with respect to diesel-gasoline in terms of equivalent BSFCeq and NOx, while the substitution of diesel by OMEx in the dual-mode dual-fuel combustion has the potential of, although penalizing HC and CO emissions, not only achieving the EURO VI NOx (0.4 g/kWh) limits but also the future potential EURO VII (0.2 g/kWh) as well because of a negligible soot production that allows using EGR levels of up to 50%.

Related Products of 645-36-3, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 645-36-3 is helpful to your research.

In an article, author is Zhang, Hang, once mentioned the application of 93-04-9, Name is 2-Methoxynaphthalene, molecular formula is C11H10O, molecular weight is 158.2, MDL number is MFCD00004061, category is ethers-buliding-blocks. Now introduce a scientific discovery about this category, Name: 2-Methoxynaphthalene.

Inhibitory effects of functionalized polycarboxylate retarder on aberrant thickening phenomena of oil well cement at high temperature

Aberrant thickening of cement slurry caused by polycarboxylate retarders mainly refers to abnormal gelation and thickening time reversal (TTR) when temperature reaches above 120 degrees C. These phenomena would directly jeopardize cementing operation and hinder the application of polycarboxylate retarders in oil and gas exploitation. Herein, two functionalized polycarboxylate retarders were synthesized to overcome the challenges in complex conditions. The incorporation of isoprenyl oxy poly(ethyleneglycol) ether (TPEG) and [3-(methacryloylamino) propyl] trimethyl ammonium chloride (MAPTAC) was capable of preventing unfavorable crosslinking and chelation reaction between cement grains and polymer, thereby avoiding abnormal gelation. It was also found that the hydrophobic association behavior of long side chain in TPEG could cause the gradual release of carboxyl groups at elevated temperature, which was unfavorable for TTR inhibition. When the TPEG was replaced by N-Vinyl-2-Pyrrolidinone (NVP), its retarding effect gradually weakened when temperature rose from 130 degrees C to 150 degrees C, and excellent inhibition of TTR was achieved. (C) 2020 Elsevier Ltd. All rights reserved.

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In an article, author is Wankowski, James L., once mentioned the application of 150-78-7, Application In Synthesis of 1,4-Dimethoxybenzene, Name is 1,4-Dimethoxybenzene, molecular formula is C8H10O2, molecular weight is 138.16, MDL number is MFCD00008401, category is ethers-buliding-blocks. Now introduce a scientific discovery about this category.

Ionic liquid (IL) cation and anion structural effects on the extraction of metal ions into N-alkylpyridinium-based ILs by a macrocyclic polyether

Previous studies of the effect of IL cation/anion hydrophobicity and the nature of the aqueous phase anion on the partitioning of alkali and alkaline earth cations between an acidic aqueous phase and 1,3-dialkylimidazolium-based or quaternary ammonium-based ILs in the presence of a crown ether have revealed significant similarities between the behavior of the two IL families. To further explore the generality of these observations and their potential application in the rational design of ILs for use as replacements for the molecular diluents typically employed as extraction solvents, the extraction of several metal ions (Na+, Sr2+ and Ba2+) from nitric and hydrochloric acid solutions by dicyclohexano-18-crown-6 (DCH18C6) into a series of N-alkylpyridinium-based ILs (C-n-pyr(+) ILs) has been studied. Although much of the extraction behavior observed in these systems is consistent with that seen for the 1,3-dialkylimidazolium and quaternary ammonium-based ILs, certain observations, in particular the effect of IL cation hydrophobicity on divalent metal ion extraction from HNO3 by N-alkylpyridinium-ILs bearing long (dodecyl- and tetradecyl-) alkyl chains, cannot be fully explained by the established three-path model for metal ion partitioning. Instead a complete description of metal ion extraction in these systems requires consideration of the aggregation of the IL cation in the aqueous phase. The effects of this aggregation on the efficiency and selectivity of metal ion extraction into C-n-pyr(+) ILs by the crown ether are systematically explored.

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Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Kobayashi, Ryo, once mentioned the application of 20059-73-8, Name is 2-(4-(Aminomethyl)phenoxy)-N,N-dimethylethanamine, molecular formula is C11H18N2O, molecular weight is 194.27, MDL number is MFCD01075231, category is ethers-buliding-blocks. Now introduce a scientific discovery about this category, Product Details of 20059-73-8.

Cleavage of C-O and C-H bonds in ethers by a genuine Si=O bond

An isolable three-coordinate dialkylsilanone without substantial electronic stabilization reacts with several ethers resulting in the cleavage of the C-O or C-H and C-O bonds in the ethers which have not been observed for the hitherto-known electronically stabilised isolable Si=O species. The formation of the Lewis base (DMAP and MTHP) complexes of the dialkylsilanone and the DFT calculations elucidated that the coordination of the ethereal oxygen atom to the Lewis acidic Si atom of the genuine Si=O bond is a key interaction for the reaction.

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Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. , Product Details of 103-50-4, 103-50-4, Name is Benzyl ether, molecular formula is C14H14O, belongs to ethers-buliding-blocks compound. In a document, author is Fredon, Adrien, introduce the new discover.

Quantification of the Role of Chemical Desorption in Molecular Clouds

Dark molecular clouds have low temperatures of approximately 10 K and experience very little UV irradiation. These clouds are the birthplace of new stars and consist of gas and dust particles. The latter can act as a meeting place to facilitate surface chemistry to form saturated molecules such as formaldehyde, methyl formate, and dimethyl ether. These complex organic molecules or COMs become encapsulated in the ice that forms on the dust grains, and these ices are the precursor for cometary ices and other icy bodies. They likely played a role in bringing material to the early earth. Although these COMs are likely formed on the surfaces of dust grains, several of them have been detected in the gas phase. This means that they have desorbed from the grain under these cold, dark conditions where thermal desorption and photodesorption are negligible. It has been speculated that reactive, or chemical, desorption is responsible for the high gas-phase abundance. After a surface reaction, its products might be vibrationally, translationally, and/or rotationally excited. Dissipation of the excess energy to translational energy can briefly increase the desorption rate, leading to chemical desorption. Astrochemical modellers have added terms to their rate equations to account for this effect. These terms, however, have had little experimental or theoretical verification. In this Account, we use classical molecular dynamics (MD) simulations to give adsorbed molecules a fixed amount of energy as a proxy for excess energy and to record whether this leads to desorption. The excitation energy can be varied freely while keeping all other variables constant. This allows for the study of trends rather than being limited to a single reaction and a single system. The focus is on the dependence of the chemical desorption on the excitation energy, excitation type, and binding energy. Rotational and vibrational excitation was explicitly taken into account. An analytical expression for the chemical desorption probability was obtained in this way. It depends on the binding energy and reaction enthalpy. This expression was then implemented in a gas-grain astrochemical code to simulate the chemical evolution of a dark molecular doud, and the results were compared against observational abundances of COMs in three different molecular clouds. The results with our new expression based on the MD simulations show good agreement for all species except H2CO, which has both gas-phase and surface-formation routes. This is a significant improvement over models without chemical desorption or with other expressions for chemical desorption, as frequently used by other authors. It is encouraging to see that a general description with a firmer theoretical basis leads to a significant improvement. Understanding chemical desorption can help to explain the unexpectedly high gas-phase abundance of some COMs, and chemical desorption also provides a link between the gas phase and the ice mantle, and its understanding might help in creating a diagnostic tool to learn more about the ice composition.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 103-50-4. Product Details of 103-50-4.