Tag: M.W=100-200

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 62009-47-6, Name is 2-Aminomalonamide, SMILES is O=C(C(C(N)=O)N)N, in an article , author is Boshta, Nader M., once mentioned of 62009-47-6, Computed Properties of C3H7N3O2.

Solubility Enhancement of Vitamins in Water in the Presence of Covitamins: Measurements and ePC-SAFT Predictions

Scarce knowledge on the behavior of vitamins in aqueous solutions in the presence of additives is often a limiting factor for industrial applications such as process design and optimization. Knowing the pH-solubility profiles of vitamins is fundamental for understanding and controlling their behavior in aqueous solutions. In the present work, pH-dependent solubilities of the vitamins ascorbic acid (VC), riboflavin (VB2), nicotinic acid (VB3(acid)), folic acid (VB9), and cyanocobalamin (VB12) were measured at T = 298.15 K and p = 1 bar. These results were compared to the pH-solubility profiles obtained with modified Henderson-Hasselbalch equations using pK(a) values from the literature. Further, the solubilities of poorly soluble VB2, VB9, and VB12 were increased by the addition of covitamins VC, VB3(acid), and nicotinamide (VB3(acid)). As observed, VB3(amide )increases the vitamin solubility much stronger than VC and VB3(acid). These covitamins are called hydrotropes in several works in the literature, and they increase the solubility of other vitamins by manipulating the pH of the saturated solutions and by molecular cross-interactions. The interplay between both pH and cross-interactions depends strongly on the kind and concentration of covitamin. At low concentrations, VC and VB3(amide) (<0.2 m) increased solubility by pH change. At higher concentrations of VC and VB3(amide) added, mainly cross-interactions between vitamin and covitamin determine the strength of solubility increase. To separate these effects and to further reduce experimental effort, electrolyte perturbed-chain statistical association fluid theory was used to predict vitamin solubility. The pH-solubility profiles and the solubilities of vitamins in water at T = 298.15 K and p = 1 bar upon addition of covitamins were predicted with reasonable accuracy. This success resulted from accounting for different charged and neutral vitamin species according to the pH and from considering explicitly the vitamin- water and vitamin-covitamin interactions. It could be shown that hydrotropic solubilization of a vitamin is the increase of vitamin solubility caused by pH shift and by cross-interactions between the saturated species of a vitamin and the added covitamin. Interested yet? Read on for other articles about 62009-47-6, you can contact me at any time and look forward to more communication. Computed Properties of C3H7N3O2.

In an article, author is Li, Xue, once mentioned the application of 1668-10-6, Application In Synthesis of H-Gly-NH2.HCl, Name is H-Gly-NH2.HCl, molecular formula is C2H7ClN2O, molecular weight is 110.54, MDL number is MFCD00013008, category is amides-buliding-blocks. Now introduce a scientific discovery about this category.

The role of precursor decomposition in the formation of samarium doped ceria nanoparticles via solid-state microwave synthesis

The impact on the final morphology of ceria (CeO2) nanoparticles made from different precursors (commercial: cerium acetate/nitrate) and in house: cerium tri(methylsilyl)amide (Ce-TMSA)) via a microwave solid state reaction has been determined. In all instances, powder X-ray diffraction indicated that the cubic fluorite CeO2 phase (PDF# 04-004-9150, with the space group Fm-3 m) had formed. Scanning electron microscopy (SEM) images revealed spherical nanoparticles were produced from the Ce-TMSA precursor. The commercial acetate and nitrate precursors produced particles with irregular morphology. The roles of the precursor decomposition and binding energy in the synthesis of the nanocrystals with various morphologies, as well as a possible growth mechanism, were evaluated based on experimental and computational data. The formation of spherical shaped nanoparticles was determined to be due to the preferential single-step decomposition of the Ce-TMSA as well as the low activation energy to overcome decomposition. Due to the complicated decomposition of the commercial precursors and high activation energy the resulting particles adopted an irregular morphology. Highly uniform samarium doped ceria (SmxCe1-xO2-delta) nanospheres were also synthesized from Ce-TMSA and samarium tri(methylsilyl)amide (Sm-TMSA). The effects of reaction time and temperature, on the final morphology were observed through SEM. The rapid single-step decomposition of TMSA-based precursors as observed through thermogravimetric analysis (TGA) and confirmed through the calculation of potential energy surfaces and binding energies from density functional theory (DFT) calculations, indicated that nanoparticle formation follows LaMer’s classical nucleation theory.

If you are interested in 1668-10-6, you can contact me at any time and look forward to more communication. Application In Synthesis of H-Gly-NH2.HCl.

Reference of 20859-02-3, Redox catalysis has been broadly utilized in electrochemical synthesis due to its kinetic advantages over direct electrolysis. The appropriate choice of redox mediator can avoid electrode passivation and overpotential. 20859-02-3, Name is H-Tle-OH, SMILES is CC(C)(C)[C@H](N)C(O)=O, belongs to amides-buliding-blocks compound. In a article, author is Li, Chun-Xiao, introduce new discover of the category.

Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution

Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of epsilon-caprolactam and hexamethylene adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative C-13 NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from -286.43 to -212.43 kJ mol(-1) as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. This work could provide theoretical support and new insights for controllable preparation of PA6 copolymers and ultimately be beneficial to extend their applications.

Reference of 20859-02-3, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about 20859-02-3 is helpful to your research.

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. Recommanded Product: 3211-76-5, 3211-76-5, Name is L-SelenoMethionine, SMILES is O=C(O)[C@@H](N)CC[Se]C, in an article , author is Dantignana, Valeria, once mentioned of 3211-76-5.

Interaction of Na+ and K+ ions with DTPA-amide dioxa-pentaaza-cyclophanes: effect of electrostatic field in macrocyclic cavity on UV absorption spectra and protonation

The effects of electrolytes on protonation were studied by UV spectrometry on the geometrical isomers of dioxapentaazacyclophanes that were synthesized by 1+1-cyclization of diethylenetriaminepentaacetic (DTPA) dianhydride with aromatic diamine involving 1,3- or 1,4-phenylenebis(methyleneoxy) group. Absorption bands at 245 and 280nm respond to pH in association with the protonation status confirmed by H-1 NMR. The logarithmic first-protonation constants, determined from the absorptivity versus pH curves, depend on coexisting alkali metal ions in a range of 7.7-8.2 in 0.01 M solutions of the chlorides. The more pronounced effect of alkali metals occurs in the dissociation of amide proton; the logarithmic deprotonation constant, log Kp-1, of the 1,3-oxymethyl isomer is -9.48 in 0.01 M NaCl and -10.35 in 0.01 M KCl; the constant of the 1,4-oxymethyl isomer, -9.79 in 0.01 M NaCl and -11.58 in 0.01 M KCl; no amide deprotonation is observable in 0.01 M LiCl. Alkali metal ions Na+ and K+ are accommodated in a macrocyclic cavity through interaction with the oxa-donor sites, and produce an intense electrostatic field within the cavity. The resulting field causes large changes in absorptivity, and also enforces amide deprotonation. Sodium ion is so effective that the deprotonation occurs at pH as low as 9.5-9.8. Potassium ion is less effective on the amide deprotonation, but the action is selective towards the isomers.

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Electric Literature of 146374-27-8, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 146374-27-8, Name is 2-Methylpropane-2-sulfinamide, SMILES is CC(C)(C)[S](=O)N, belongs to amides-buliding-blocks compound. In a article, author is Liu, Changyao, introduce new discover of the category.

Amide-functionalized heterometallic helicate cages as highly efficient catalysts for CO2 conversion under mild conditions

Mimicking nature seems to be one of the smartest strategies to design novel catalysts for CO2 conversion under mild conditions. Herein, we report a facile and efficient method to construct two amide-functionalized heterometallic helicate cages as enzyme mimic catalysts for the synthesis of cyclic carbonates. These helicate cages show high thermal stability and exceptionally high catalytic activity and size-dependent selectivity toward small epoxides in catalytic CO2 cycloaddition to obtain cyclic carbonates even under ambient conditions. The construction of this novel functionalized cage provides an efficient approach for realizing CO2 conversion under mild conditions.

Electric Literature of 146374-27-8, 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 146374-27-8.

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 56-84-8, Name is H-Asp-OH, molecular formula is C4H7NO4. In an article, author is Das, Deb Kumar,once mentioned of 56-84-8, Safety of H-Asp-OH.

Mononuclear Silver Complexes for Efficient Solution and Vacuum-Processed OLEDs

Carbene metal amides are a new class of highly efficient light-emitting molecules based on a linear donor-metal-acceptor geometry. Here the synthesis, structure, and photo- and electroluminescence of carbene silver carbazolato complexes, (L-Ad)Ag(Cz) [L-Ad = adamantyl-substituted cyclic (alkyl)(amino)carbene; Cz = carbazolate (1) and 3,6-(t)Bu(2)Cz (2)], are reported. They display green emission with photoluminescence quantum yields of up to 74%. Efficient mixing of triplet and singlet excited states is observed, with sub-microsecond thermally activated radiative triplet lifetimes. These complexes provide prototype organic light-emitting diodes based exclusively on silver emitters, with external quantum efficiencies of up to 14%.

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Reference of 683-57-8, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 683-57-8, Name is 2-Bromoacetamide, SMILES is O=C(N)CBr, belongs to amides-buliding-blocks compound. In a article, author is Sletten, Eric T., introduce new discover of the category.

Synthesis of 2-Oxazolines from Ring Opening Isomerization of 3-Amido-2-Phenyl Azetidines

Chiral 2-oxazolines are valuable building blocks and famous ligands for asymmetric catalysis. The most common synthesis involves the reaction of an amino alcohol with a carboxylic acid. In this paper, an efficient synthesis of 2-oxazolines has been achieved via the stereospecific isomerization of 3-amido-2-phenyl azetidines. The reactions were studied in the presence of both Bronsted and Lewis acids, and Cu(OTf)(2) was found to be the most effective.

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Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics, 92-50-2, Name is 2-(Ethyl(phenyl)amino)ethanol, SMILES is CCN(CCO)C1=CC=CC=C1, belongs to amides-buliding-blocks compound. In a document, author is Shen, Tao, introduce the new discover, Category: amides-buliding-blocks.

Effects of unsaturated double bonds on adsorption and aggregation behaviors of amide-based cationic Gemini surfactants

Four cationic amide Gemini surfactants, containing unsaturated and saturated hydrophobic chains, were synthesized from oleamide propyl dimethylamine (PKO-18:1) and stearate amide propyl dimethylamine(PKO-18). The chemical structures of the synthesized compounds were characterized by FT-IR spectra and H-1 NMR. The Krafft temperatures were experimentally determined.. Their critical micelle concentration(CMC) in the aqueous solutions were determined by surface tension and conductivity methods. Equilibrium surface tension parameters such as gamma(cmc), pC(20), Gamma(max), A(min), Delta G degrees(mic)(Gibbs free energy of micellization), Delta G degrees(ads)(Gibbs free energy of adsorption) were obtained. Their adsorption behavior was analyzed through dynamic surface tension. Also, their self-assembly behaviors were investigated by negative-stained transmission electron microscopy(TEM) and critical packing parameter calculation. The results showed that the unsaturated double bond in hydrophobic chains was favorable for lowering the Krafft temperature and CMC. The oleamide-based Gemini surfactants present a lower Krafft temperature, higher surface activity and the adsorption kinetic process were conformed mixed diffusion-kinetic control model. The TEM results showed that the oleamide-based Gemini surfactants containing unsaturated double bonds in hydrophobic chains preferentially form worm-like micelles in solution. However, the stearate amide Gemini surfactants whose hydrophobic chains are saturated alkyl chains tend to form spherical aggregates in solution.

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 92-50-2 is helpful to your research. Category: amides-buliding-blocks.

Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics, HPLC of Formula: C6H13NO4, 150-25-4, Name is 2-(Bis(2-hydroxyethyl)amino)acetic acid, SMILES is OCCN(CCO)CC(O)=O, belongs to amides-buliding-blocks compound. In a document, author is Gao, Huashan, introduce the new discover.

Determination of Activity Coefficients at Infinite Dilution of Solutes in N,N ‘-Di(2-ethylhexyl)isobutyramide Using Inverse Gas-Liquid Chromatography

Activity coefficients at infinite dilution for 30 solutes (alkanes, alkenes, alkyl benzenes, ketones, chloromethanes, aromatic compounds, acetonitrile, formaldehyde, and ethyl acetate) in N,N’-di(2-ethylhexyl)isobutyramide have been determined at temperatures T = (323.15 to 373.15) K by inverse gas chromatographic technique. Net retention volumes of solutes have been measured as a function of temperature. From the temperature dependence of the activity coefficients at infinite dilution, partial molar excess enthalpies and activity coefficients at infinite dilution at 298.15 K of solutes in N,N’-di(2-ethylhexyl)isobutyramide have been derived. Selectivity values at infinite dilution have been computed from the activity coefficients at infinite dilution values.

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 150-25-4 is helpful to your research. HPLC of Formula: C6H13NO4.

Synthetic Route of 51-35-4, Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. 51-35-4, Name is H-Hyp-OH, SMILES is O=C(O)[C@H]1NC[C@H](O)C1, belongs to amides-buliding-blocks compound. In a article, author is Shan, Qiyuan, introduce new discover of the category.

2D covalent organic frameworks with built-in amide active sites for efficient heterogeneous catalysis

Benzene-1,3,5-tricarboxamides (BTAs) are versatile building blocks for supramolecular assembly due to the strong intermolecular hydrogen bonding. Herein, a BTA based amine, N-1,N-3,N-5-tris(4-aminophenyl)benzene-1,3,5-tricarboxamide (TABTA), was successfully applied to construct two new amide functionalized covalent organic frameworks (COFs) with apparent crystallinity, which were further applied as efficient catalysts for Knoevenagel condensation.

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