Tag: M.W:100-200

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Syntheses, Characterization, and Application of Tridentate Phenoxyimino-Phenoxy Aluminum Complexes for the Coupling of Terminal Epoxide with CO2: From Binary System to Single Component Catalyst

A series of binuclear aluminum complexes 1-3 supported by tridentate phenoxyimino-phenoxy ligands was synthesized and used as catalysts for the coupling reaction of terminal epoxide with carbon dioxide. The aluminum complex 1, which is catalytically inactive toward the coupling of epoxide with CO2 by itself, shows moderate activity in the presence of excess nucleophiles or organic bases at high temperature. In sharp contrast to complex 1, bifunctional complexes 2 and 3, which incorporate tertiary amine groups as the built-in nucleophile, are able to efficiently transform terminal epoxide with CO2 to corresponding cyclic carbonates as a sole product by themselves at 100 degrees C. The number of amine groups on the ligand skeleton and the reaction temperature exert a great influence on the catalytic activity. The bifunctional complexes 2 and 3 are also active at low carbon dioxide pressure such as 2 atm or atmospheric CO2 pressure. Kinetic studies of the coupling reactions of chloropropylene oxide/CO2 and styrene oxide/CO2 using bifunctional catalysts under atmospheric pressure of CO2 demonstrate that the coupling reaction has a first-order dependence on the concentration of the epoxide.

If you are hungry for even more, make sure to check my other article about 4045-44-7, Application In Synthesis of 1,2,3,4,5-Pentamethylcyclopenta-1,3-diene.

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

Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology. 4045-44-7, Name is 1,2,3,4,5-Pentamethylcyclopenta-1,3-diene, molecular formula is , belongs to catalyst-ligand compound. In a document, author is Kiran, Indukuru Naga Chaithanya, SDS of cas: 4045-44-7.

A Monocationic Zn(II) Acetate Complex of a Chiral Bisamidine Dioxolane Ligand, Naph-diPIM-dioxo-R, for the Asymmetric 1,3-Dipolar Cycloaddition of Tridentate alpha-Substituted alpha-Imino Esters and Acrylates to Multi-Substituted Prolines: Importance of an n-pi* Interaction for High Enantioselectivity

A monocationic Zn(II) acetate complex of a C-2-chiral bisamidine-type sp(2)N bidentate ligand (L-R) possessing two dioxolane oxygen n orbitals in the reaction site catalyzes, without the use of an external base, a highly efficient asymmetric 1,3-dipolar cycloaddition (1,3-DC) of tridentate alpha-substituted alpha-imino esters with acrylates, attaining up to >99:1 enantiomeric ratio with perfect regio- and diastereo-selectivities. A catalyst loading of 0.1 mol% is generally acceptable to furnish various chiral multi-substituted prolines. Both (S)-alpha-imino ester and the R enantiomer show a high level of enantioselectivity. An overall picture of the present 1,3-DC has been revealed via analyses of substrate structure/reactivity/selectivity relationships, NMR, MS, X-ray diffraction, C-12/C-13 isotope effects, rate law, and kinetics. The first success in the high performance 1,3-DC is ascribed to i) a Bronsted base/Lewis acid synergistic effect of [Zn(OAc)L-R]OTf (R cat); ii) the existence of the n orbital, which determines the position of the intermediary N,O-cis-Zn enolate (dipole) by an n-pi* non-bonding attractive interaction between the oxygen atom in L-R and the C=N moiety of the dipole; and iii) utilization of chelatable alpha-imino esters capturing Zn(II) as a tridentate ligand. A C-12/C-13 analysis has clarified that a stepwise 1,3-DC mechanism is operating.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 4045-44-7, in my other articles. SDS of cas: 4045-44-7.

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

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, Safety of H-Oic-OH80875-98-5, Name is H-Oic-OH, SMILES is O=[C@@]([C@H]2N[C@@]1([H])CCCC[C@]([H])1C2)O, belongs to catalyst-ligand compound. In a article, author is Ren, Ruirui, introduce new discover of the category.

A New ternary organometallic Pd(ii)/Fe(iii)/Ru(iii) self-assembly monolayer: the essential ensemble synergistic for improving catalytic activity

The synergistic catalytic effect in a hetero-trimetallic catalytic monolayer is one of the intriguing topics because the additive effects of the second or third component play an important role in improving the activity. In this paper, a new Schiff-base organometallic nanosheet containing Pd/Fe/Ru immobilized on graphene oxide (GO@H-Pd/Fe/Ru) was prepared and characterized. The catalytic performance of GO@H-Pd/Fe/Ru and synergistic effect were systematically investigated. GO@H-Pd/Fe/Ru was found to be an efficient catalyst with higher turnover frequency (TOF) (26 892 h(-1)) and stability with recyclability of at least 10 times in the Suzuki-Miyaura coupling reaction. The deactivation mechanism was caused by the aggregation of the active species, loss of the active species, the changes of the organometallic complex, and active sites covered by adsorbed elements during the catalytic process. GO@H-Pd/Fe/Ru was a heterogeneous catalyst, as confirmed by kinetic studies with in situ FT-IR, thermal filtration tests and poisoning tests. The real active center containing Pd, Ru and Fe arranged as Fe(iii)-Ru(iii)-Pd(ii)-Fe(iii) was proposed. Although Ru(iii) and Fe(iii) were shown to be less active or inactive, the addition of Fe and Ru could effectively improve the entire activity by their ”indirect” function, in which Fe or Ru made Pd more negative and more stable. The ensemble synergistic effect between metals, the ligand and support was described as a process in which the electron was transferred from GOvia ligand to Ru, and then to Pd or from Fe to Pd to make Pd more negative, promoting the oxidation addition with aryl halide. Also, the vicinity of Ru around Pd as the promoter adsorbed aryl boronic acid, which facilitates its synergism to react with the oxidation intermediate to the trans-metallic intermediate.

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. you can also check out more blogs about 80875-98-5. Safety of H-Oic-OH.

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

In an article, author is Ariannezhad, Maryam, once mentioned the application of 4045-44-7, Name is 1,2,3,4,5-Pentamethylcyclopenta-1,3-diene, molecular formula is C10H16, molecular weight is 136.234, MDL number is MFCD00001354, category is catalyst-ligand. Now introduce a scientific discovery about this category, Category: catalyst-ligand.

The capable Pd complex immobilized on the functionalized polymeric scaffold for the green benzylation reaction

The Pd complex immobilized on the functionalized polymeric support was prepared by the functionalization of the 4-(benzyloxy)benzyl chloride polymer with 5-phenyl-1-H-tetrazole and the subsequent complexation with PdCl2. Then, it was characterized with different methods and used as catalyst in the green benzylation reaction of various aryl cyanamides with benzyl bromide and K2CO3 in EtOH at 60 degrees C for the appropriate times. Also, the antibacterial properties of the Pd polymer-supported complex were studied against a number of gram-positive and gram-negative bacteria, and in some cases, it has the same effect as a tetracycline standard antibiotic against Bacillus thuringiensis (a gram-positive bacterium) and Serratia marcescens (a gram-negative bacterium).

Do you like my blog? If you like, you can also browse other articles about this kind. Thanks for taking the time to read the blog about 4045-44-7, Category: catalyst-ligand.

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

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 96556-05-7, Name is 1,4,7-Trimethyl-1,4,7-triazonane, SMILES is C1CN(CCN(CCN1C)C)C, belongs to catalyst-ligand compound. In a document, author is Gladis, E. H. Edinsha, introduce the new discover, HPLC of Formula: C9H21N3.

Transition metal chelates with multifunctional 1,10-phenanthroline derivative towards production of hydrogen as alternative fuel from sea water: Design, synthesis, characterization and catalytic studies

In the present studies were focused on the preparation, characterization and catalytic behaviour of highly conjugative pi-acceptor type ligand with metal ions (M = Co2+, Zn2+, Cu2+ and Ni2+) as catalyst for evolution of hydrogen as alternate fuel. Then, the activated charcoal was obtained from natural origin such as coconut & rice husk enriched with oxygen derived functionalities and effectively remove cations (Na+, Mg2+), anions (Cl-, SO42-) ions and other contaminants from sea water (saline water). The prepared metal complexes behave as catalyst for the splitting of water into hydrogen gas under photo irradiation and electrochemical approach. Because of its redox characteristics and stabilization of unusual oxidation states during the catalytic cycle, the copper complex showed higher efficiency for the production of hydrogen gas (turnover number (TON) and turnover frequency (TOF) values, 15,600 & 8100) as compared to other chelates and related chelates in the literature sources. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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 96556-05-7 is helpful to your research. HPLC of Formula: C9H21N3.

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

95-13-6, Name is Indene, molecular formula is C9H8, belongs to catalyst-ligand compound, is a common compound. In a patnet, author is Annunziata, Alfonso, once mentioned the new application about 95-13-6, COA of Formula: C9H8.

A hydrophilic olefin Pt(0) complex containing a glucoconjugated 2-iminopyridine ligand: Synthesis, characterization, stereochemistry and biological activity

The synthesis of a novel water-soluble Pt(0) complex [Pt(1-glu(Ac))(dmf)] containing a glucoconjugated 2-iminopyridine ligand and dimethylfumarate is reported. Highly diastereoselectivity leads to the prevalent formation of only one of the possible diasteroisomers, which has been characterized by mono- and bi-dimensional NMR techniques. The anticancer activity of the complex was evaluated against two couples of cell lines, and the IC50 values reveal that it is more cytotoxic than cisplatin but no selective toward cancer cells.

If you¡¯re interested in learning more about 95-13-6. The above is the message from the blog manager. COA of Formula: C9H8.

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

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 344-25-2, Name is H-D-Pro-OH, SMILES is O=C(O)[C@@H]1NCCC1, in an article , author is Rowland, Casey A., once mentioned of 344-25-2, Category: catalyst-ligand.

Novel syntheses of carbazole-3,6-dicarboxylate ligands and their utilization for porous coordination cages

The molecular nature, and thus potential solubility, of coordination cages endows them with a number of advantages as compared to metal-organic frameworks and other extended network solids. However, their lack of three-dimensional connectivity typically limits their thermal stability as inter-cage interactions in these materials are relatively weak. This is particularly the case for carbazole-based coordination cages. Here, we report the design and synthesis of a benzyl-functionalized octahedral coordination cage that displays moderate surface area and increased thermal stability as compared to its unfunctionalized counterpart. Structural analysis suggests the increased thermal stability is a result of aryl-aryl interactions between ligand groups on adjacent cages. We have further adapted the ligand synthesis strategy to afford a novel, high-yielding preparatory route for the isolation of carbazole-3,6-dicarboxylic acid that does not rely on pyrophoric reagents or transition metal catalysts.

Interested yet? Read on for other articles about 344-25-2, you can contact me at any time and look forward to more communication. Category: catalyst-ligand.

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

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 95-13-6, Name is Indene, SMILES is C12=C(CC=C2)C=CC=C1, in an article , author is Zhang, Linfeng, once mentioned of 95-13-6, Recommanded Product: Indene.

Microwave-Assisted Nickel-Catalyzed Rapid Reductive Coupling of Ethyl 3-iodopropionate to Adipic Acid

3-iodopropionic acid (3-IPA) can be efficiently synthesized from the glycerol derivative glyceric acid (GA), which is a potential biomaterial-based platform molecule. In this report, ethyl 3-iodopropionate was rapidly dimerized to diethyl adipate in a microwave reactor using NiCl2 center dot 6H(2)O as a catalyst, co-catalyzed by Mn and the 1, 10-Phenanthroline monohydrate ligand. Under the optimum reaction conditions, diethyl adipate can be obtained with 84% yield at 90 degrees C in just 5 min. Diethyl adipate was hydrolyzed to obtain the adipic acid (AA) in 89% yield with an acid catalyst. AA is an important chemical and a monomer for producing a wide range of high-performance polymeric substances. This rapid coupling method is also applicable to other alkyl halides. [GRAPHICS] .

Interested yet? Read on for other articles about 95-13-6, you can contact me at any time and look forward to more communication. Recommanded Product: Indene.

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. 344-25-2, Name is H-D-Pro-OH, molecular formula is C5H9NO2. In an article, author is Lim, Taeho,once mentioned of 344-25-2, Formula: C5H9NO2.

Ligand-free Suzuki-Miyaura cross-coupling with low Pd content: rapid development by a fluorescence-based high-throughput screening method

Suzuki-Miyaura (SM) cross-coupling is one of the most effective strategies for carbon-carbon bond formation, but previous methods have several drawbacks, such as the requirement of complicated ligands, toxic organic solvents, and high-content-Pd catalysts. Thus, in this study, a highly efficient SM cross-coupling was developed using metal oxide catalysts: 0.02 mol% Pd, aqueous solvent, no ligand, and room temperature. Metal oxides containing low Pd content (ppm scale) were prepared by a simple co-precipitation method and used as a catalyst for the SM reaction. A fluorescence-based high-throughput screening (HTS) method was developed for the rapid evaluation of catalytic activity and reaction conditions. Among the various metal oxides, Pd/Fe2O3 showed the highest activity for the SM reaction. After further optimization by HTS, various biaryl compounds were obtained under optimal conditions: Pd/Fe2O3 (0.02 mol% Pd) in aqueous ethanol at mild temperature without any ligands.

Interested yet? Keep reading other articles of 344-25-2, you can contact me at any time and look forward to more communication. Formula: C5H9NO2.

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

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 He, Fei, once mentioned the application of 366-18-7, Name is 2,2′-Bipyridine, molecular formula is C10H8N2, molecular weight is 156.18, MDL number is MFCD00006212, category is catalyst-ligand. Now introduce a scientific discovery about this category, Computed Properties of C10H8N2.

Boosting Oxygen Electroreduction over Strained Silver

Manipulating the strain effect of Ag without any foreign metals to boost its intrinsic oxygen reduction reaction (ORR) activity is intriguing, but it remains a challenge. Herein, we developed a class of Ag-based electrocatalysts with tunable strain structures for efficient ORR via ligand-assisted competitive decomposition of Ag-organic complexes (AgOCs). Benefiting from the superior coordination capability, 4,4′-bipyridine as a ligand triggered a stronger competition with NaBH4 for Ag ions during reduction-induced decomposition of AgOCs in comparison with the counterparts of the pyrazine ligand and the NO3- anion, which moderately modulated the compressive strain structure to upshift the d-band center of the catalyst and increase the electron density of Ag. Accordingly, the O-2 adsorption was obviously improved, and the stronger repulsion effect between the Ag sites and the 4e ORR product, i.e., the electron-rich OH-, was generated to promote the desorption of OHvia the Ag-OH bond cleavage, which enabled more Ag sites to be regenerated after ORR. Both of these led to an enhancement to the intrinsic ORR activity of the Ag-based catalyst. This competitive decomposition of metal-organic complex strategy would catalysts with the well-tuned strain structures for energy conversion and heterocatalysis.

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