Tag: M.W:500-600

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Product Details of 52093-25-1, Which mentioned a new discovery about 52093-25-1

2-Amino-4H-pyrane derivatives are nowadays well recognized as valuable scaffold in drug discovery. In this manuscript a new and improved multicomponent process for the chemical synthesis of the title compounds is described. beta-Dicarbonyl and activated cyanomethylene compounds, and aromatic, aliphatic or alpha,beta-unsaturated aldehydes have been subjected to a three-component reaction under the catalysis of ytterbium triflate hydrate under solvent-free conditions at 50 C, and by application of microwaves and ultrasounds. Of the three methodologies employed, the reaction in neat performed in a flask with magnetic stirring proved to be by far the most efficient, providing the desired adducts in very good yields (85?91%). The experimental protocol set-up in this study was applied without significant differences in terms of yields to aromatic aldehydes having electron withdrawing or electron-donating substituents, as well as to aliphatic and alpha,beta-unsaturated ones. Moreover ytterbium triflate has been easily recovered from each reaction media and reused without appreciable loss of its catalytic activity.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 76089-77-5, 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. 76089-77-5, Name is Cerium(III) trifluoromethanesulfonate, molecular formula is C3CeF9O9S3. In a Article，once mentioned of 76089-77-5

The crystal structure of [(COT)Ce(mu-O3SCF3)(THF)2]2 (1) (COT = eta8-C8H8) has been determined by X-ray diffraction. The compound crystallizes in the triclinic space group P1 (a = 930.7(4), b= 1274.4(7), c = 1864.1(10) pm; alpha = 97.68(6), beta = 101.01(2), gamma = 105.25(1); Z = 2). Together with the bridging triflate ligands the cerium atoms form an eight-membered Ce2O4S2 ring. Treatment of 1 with 2 equiv. of K[1,3-(t)Bu2C5H3] affords the mixed-sandwich complex (COT)Ce(eta5-1,3-(t)Bu2C5H3) (2) in 78% yield. Furthermore, the preparation of a series of new lanthanide half-sandwhich complexes containing the 1,4-bis(trimethylsilyl)-cyclooctatetraenyl ligand (= COT’) and additional heteroallylic, aryloxide, and alkyl ligands is reported. (C) 2000 Elsevier Science S.A.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Electric Literature of 76089-77-5, you can also check out more blogs about76089-77-5

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 1351279-73-6, molcular formula is C30H20O8, introducing its new discovery. SDS of cas: 1351279-73-6

Due to the environmental and energy issues in the world, the chemical fixation of carbon dioxide into valuable products has been attracted many attentions in the recent years. However, the utilization of the highly chemical stabile carbon dioxide requires high bond cleavage energy of C=O bond. Thus, seeking and developments of the suitable catalysts for the chemical fixation of carbon dioxide is quite important. Metal-organic frameworks (MOFs), as a kind of porous materials, exhibit intriguing structural diversity and outstanding physical and chemical properties. Their modular nature and facile tunability make these materials ideal heterogeneous catalysts because they possess active sites and accessible channels for the attraction and retention of substrates. In this review, we intended to discuss the recent advances on some of the most interesting chemical fixation catalysis starting fromCO2 based on MOFs materials as heterogeneous catalysts under different conditions. Among all these excellent works, we hope to find and highlight the effective approaches and technique in this field, and analyze the opportunities and limitations for the MOFs catalysts for the future applications.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Quality Control of: Cerium(III) trifluoromethanesulfonate, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 76089-77-5, Name is Cerium(III) trifluoromethanesulfonate, molecular formula is C3CeF9O9S3. In a Article, authors is Girard，once mentioned of 76089-77-5

A novel catalytic system based on the combination of a homogeneous metallic salt and a platinum catalyst supported on a zirconium-based oxide was explored for the selective conversion of cellulose to C2-C3 glycols. Parameters such as the nature of the homogeneous catalyst, support effects and operating conditions were systematically varied to evaluate the potential of this dual catalytic system. Sharp analysis of reaction pathways led us to identify an optimal combination of cerium chloride and a barium zirconate-based platinum catalyst for the production of ethylene glycol and propylene glycol exhibiting substantial selectivities (>40%). The recyclability and the possible deactivation mechanisms of the catalytic system were ultimately investigated.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Product Details of 76089-77-5, Which mentioned a new discovery about 76089-77-5

Polymer electrolytes based on chitosan, glycerol, and cerium triflate are prepared by solution casting technique, and their properties are studied by complex impedance spectroscopy, thermal analysis (DSC and TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and atomic force microscopy (AFM). The concentration of cerium triflate ranges between 0.00 and 55.72 wt%. The DSC results reveal a thermal event between 128 and 145 C indicating a semi-crystalline nature of the samples. The best ionic conducting values of 1.46 × 10?6 and 8.74 × 10?5 S cm?1 at 30 and 90 C, respectively are registered for the sample containing 33.32 wt% of salt. Moreover, it is stated that an increase of glycerol amount promotes an increase of the ionic conductivity up to maximum values of 1.67 × 10?5 and 4.93 × 10?4 S cm?1 at 30 and 90 C, respectively. SEM images show clusters formation for samples with high salt concentration, and X-Ray studies point a disappearance of large peak at 2theta ? 20 and appearance of narrow one at 2theta ? 10, confirming crystalline domains formation. AFM results display the morphological characteristics of samples and 3.72 nm was the value obtained for the sample with less roughness.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， HPLC of Formula: C21H15F12NO, Which mentioned a new discovery about 848821-76-1

The effects of new and potent NOS inhibitors, S-methyl-L-thiocitrulline (S-Me-TC),3-bromo 7-nitro indazole (3-Br-7-NI), and 1-(2- trifluoromethylphenyl)imidazole (TRIM), were examined on the pilocarpine- induced seizures in mice. 3-Br-7-NI and TRIM decreased the frequency of status epilepticus and mortality, while TRIM, in addition, significantly reduced the incidence of seizures. The latencies to onsets of seizures, status epilepticus, and mortality were significantly prolonged by all three NOS inhibitors, while duration of seizures was reduced by 3-Br-7-NI and TRIM. These data suggest an excitatory effect of NO in the neuronal structure involved in the pilocarpine-induced seizures.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 1351279-73-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1351279-73-6, Name is 4,4′,4”,4”’-(Ethene-1,1,2,2-tetrayl)tetrabenzoic acid, molecular formula is C30H20O8. In a Review，once mentioned of 1351279-73-6

Catalysis of C1 chemistry, especially for carbon monoxide (CO), carbon dioxide (CO2) and methane (CH4), is critically important for the clean production of fuels and chemicals and future energy sustainability. However, due to the relatively inert nature and low reactivity of these C1 molecules, their activation and transformation into clean fuels and high value-added chemicals still remain formidable challenges. In this context, metal-organic frameworks (MOFs), as relatively new emerging crystalline porous materials, have been shown to be promising heterogeneous catalysts or supports/precursors in the design and synthesis of various functional nanomaterials for addressing these challenges. In this review, the recent advances in MOF-based heterogeneous catalysts for transforming CO, CO2 and CH4 into high value-added chemicals are systematically reviewed. Emphasis is mainly placed on the catalytic reactivity, reaction mechanism and catalyst design. Additionally, major challenges and opportunities for MOF catalysts in the conversion of C1 chemistry are discussed to outline aspects for further development in this ongoing research field. It is anticipated that this review will provide a useful guide to chemists and material scientists attempting to design better MOF-based catalysts for the chemical conversion of C1 compounds.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 76089-77-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 76089-77-5, Name is Cerium(III) trifluoromethanesulfonate, molecular formula is C3CeF9O9S3. In a Article，once mentioned of 76089-77-5

X-Ray structural analyses of the rare earth(III) trifluoromethanesulfonates (triflates) with urea derivatives are described. The reactions of anhydrous rare earth triflates with 8 equiv of tetrahydro-2- pyrimidinone (trimethyleneurea (PU)) in methanol give [M(pu)8](OTf)3 (OTf = triflate) (M = Sm: 1a; M = Y: 1b; M = Nd: 1c; M = Eu: 1d; M = Gd: 1e; M = Tb: 1f; M = Dy: 1g; M = Ho: 1h; M = Yb: 1i), and [Sc(pu)6](OTf)3 (2). X-Ray crystallographic analyses of these complexes indicate that a pair of PU ligands are interacting with each other through the hydrogen bonds. The reaction of anhydrous samarium(III) triflate with 6 equiv of 1,3-dimethyl- 3,4,5,6-tetrahydro-2(1H)-pyrimidinone (1,3-dimethyltrimethyleneurea (DMPU)) in tetrahydrofuran (THF) affords [Sm(dmpu)6](OTf)3 (3) which has a hexa- coordinated octahedral structure. Anhydrous samarium(III) triflate reacts with 5 equiv of 1,3-dimethyl-2-imidazolidinone (DMI) to give [Sm(Otf)2(dmi)5]OTf (4) which has a hepta-coordinated pentagonal bipyramidal structure. Five DMI ligands in 4 coordinate to the samarium atom in a propeller-like fashion.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Synthetic Route of 76089-77-5, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 76089-77-5, in my other articles.

Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application of 52093-25-1, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a article，once mentioned of 52093-25-1

Acyl phosphate monoesters are intermediates in many biochemical acylation reactions, such as those involving aminoacyl adenylates. Benzoyl methyl phosphate, a typical acyl phosphate monoester, is slowly hydrolyzed in neutral solutions but reacts rapidly with amines. Since biochemical processes of acyl phosphate monoesters involve accelerated reactions with oxygen-centered nucleophiles, we sought catalysts for hydrolysis and methanolysis of benzoyl methyl phosphate to mimic the biochemical outcome. Lanthanide ions are particularly effective catalysts, accelerating reactions much more than comparable levels of magnesium ion. Detailed kinetic analysis of the hydrolysis reactions reveals formation of a 1:1 complex, followed by rapid reaction with a nucleophile. The hydroxide-dependent hydrolysis rate in the europium complex is about 105 times that of free substrate with hydroxide. A mechanism that accounts for the data and observed behavior involves bidentate coordination of the metal ion by the acyl phosphate through phosphate and carbonyl oxygens, lowering the energy of the tetrahedral addition intermediate and the associated transition states. The dependence of the metal ion catalyzed process on the concentration of hydroxide ion is consistent with coordinated hydroxide acting as a nucleophile. The reaction of benzoyl methyl phosphate with methanol to form methyl benzoate and methyl phosphate is 30 000 times more rapid in the presence of 0.0001 M lanthanum triflate (in the absence of the metal ion kobs = 2.1 × 10-7 s-1, at 25C). Thus, the combination of acyl phosphate esters and lanthanide salts appears to be a promising method for biomimetic acylation of hydroxyl groups.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 137076-54-1, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.137076-54-1, Name is 2-(4,7,10-Tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetic acid, molecular formula is C28H52N4O8. In a article，once mentioned of 137076-54-1

In bioimaging, targeting allows refining the diagnosis by improving the sensitivity and especially the specificity for an earlier diagnosis. Two 111In-radiolabeled dendritic nanoprobes (DPs) (111In-2, 111In-3) and their model counterparts (111In-1, 111In-4) are designed and assessed for in vitro and in vivo tumor targeting efficiency in a murine melanoma models. Tumor uptake is correlated to dendrimer multivalency and reaches values as high as 12.7 ± 1.6% ID g-1 at 4 h post intravenous injection for 111In-3vs. 1.5 ± 0.5% ID g-1 for the unfunctionalized DP, and over 11% ID g-1 for any tumor weight whatsoever.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI