Catalyst ligands

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2-Aza-1,3-butadiene derivatives featuring an anthracene or pyrene unit: Highly selective colorimetric and fluorescent signaling of Cu2+ cation

A new probe based on an anthryl derivative bearing an azadiene side chain selectively senses Cu2+ in acetonitrile through two different channels: the yellow-to-orange color change and a remarkable enhancement of the fluorescence, whereas the pyrenyl analogous behaves as a fluorescent sensor for Cu2+ and Hg2+ in aqueous environment.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 1941-30-6. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1941-30-6

Effect of thermal treatment on surface and bulk properties of Fe/ZSM-5 zeolites prepared by different methods

Fe/ZSM-5 samples (5 wt.% Fe) prepared by in situ incorporation using TPABr template under hydrothermal conditions (Fe-ZSM-5in), chemical liquid deposition (Fe-ZSM-5imp) and solid-solid (Fe-ZSM-5ss) interaction were characterized by N2 physisorption, TG/DSC, X-ray diffraction, FTIR spectroscopy, UV-Vis diffuse reflectance spectroscopy and 57Fe Moessbauer spectroscopy techniques. Calcination at 550 C leads to almost complete removal of template that was associated with dislodgment of significant fraction of Fe to external positions as recognized for the in situ prepared sample (Fe-ZSM-5in). This sample showed an increase in lattice volume suggesting the presence of the majority of Fe ions in tetrahedral positions inside zeolite channels and offered as well the lowest crystallites size (75 nm) and maximum SBET (453 m2/g) between all samples. On the other hand, Fe-ZSM-5ssbef, resulting from solid-solid interaction and subjected to heat treatment in vacuum at 200 C, measured the lowest mean pore radius (r-; 23 A), and pore volume (Vp; 0.3887 cm3/g), giving a hint about the probability of finding neutral iron oxide nanoparticles (alpha-Fe 2O3) as a separate phase that has been validated by Moessbauer (IS = 0.3 mm/s, QS = -0.2 mm/s, Heff = 520 kOe) and UV-Vis (400 nm) investigations. This sample also demonstrated that the majority of Fe occupied framework positions beside a fraction identified as small oligonuclear oxo-iron ions (Fex3+-O; 290 nm). Interestingly, Fe-ZSM-5 ssaft, resulting from solid-solid interaction and subjected to air calcination at 550 C, measured maximum Vp (0.6380 cm 3/g) and r- (39 A) values, reflecting the enforced location of Fe in this sample leading to an effective pore widening and thus a pronounced mesoporosity is attained. IR bands due to nuasT-O in ZSM-5 (1105 cm-1) showed a shift to lower wave numbers (1059 cm -1) following Fe incorporation reflecting the extent of exchanging Fe in this sample (Fe-ZSM-5ssaft), unlike the rest of the samples which showed splitting, which accounted for the presence of residual Al3+ beside Fe3+ ions in the same site. Moessbauer data of this sample confirmed the latter result and indicated the maximum lattice imperfection and showed as well the lowest degree of crystallinity. The Fe-ZSM-5impaft sample, subjected to heat treatment at 550 C, showed alpha-Fe 2O3 species where that heated at 110 C presented the lowest SBET (361 m2/g). More correlations were evaluated and discussed on the effect of thermal treatment on the existence of various Fe species (either framework or non-framework), their electronic states and local structures.

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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, 1660-93-1, molcular formula is C16H16N2, introducing its new discovery. Computed Properties of C16H16N2

Synthesis, isomerisation and biological properties of mononuclear ruthenium complexes containing the bis[4(4?-methyl-2,2?-bipyridyl)]-1,7-heptane ligand

A series of mononuclear ruthenium(ii) complexes containing the tetradentate ligand bis[4(4?-methyl-2,2?-bipyridyl)]-1,7-heptane have been synthesised and their biological properties examined. In the synthesis of the [Ru(phen?)(bb7)]2+ complexes (where phen? = 1,10-phenanthroline and its 5-nitro-, 4,7-dimethyl- and 3,4,7,8-tetramethyl- derivatives), both the symmetric cis-alpha and non-symmetric cis-beta isomers were formed. However, upon standing for a number of days (or more quickly under harsh conditions) the cis-beta isomer converted to the more thermodynamically stable cis-alpha isomer. The minimum inhibitory concentrations (MIC) and the minimum bactericidal concentrations (MBC) of the ruthenium(ii) complexes were determined against six strains of bacteria: Gram-positive Staphylococcus aureus (S. aureus) and methicillin-resistant S. aureus (MRSA); and the Gram-negative Escherichia coli (E. coli) strains MG1655, APEC, UPEC and Pseudomonas aeruginosa (P. aeruginosa). The results showed that the [Ru(5-NO2phen)(bb7)]2+ complex had little or no activity against any of the bacterial strains. By contrast, for the other cis-alpha-[Ru(phen?)(bb7)]2+ complexes, the antimicrobial activity increased with the degree of methylation. In particular, the cis-alpha-[Ru(Me4phen)(bb7)]2+ complex showed excellent and uniform MIC activity against all bacteria. By contrast, the MBC values for the cis-alpha-[Ru(Me4phen)(bb7)]2+ complex varied considerably across the bacteria and even within S. aureus and E. coli strains. In order to gain an understanding of the relative antimicrobial activities, the DNA-binding affinity, cellular accumulation and water-octanol partition coefficients (logP) of the ruthenium complexes were determined. Interestingly, all the [Ru(phen?)(bb7)]2+ complexes exhibited stronger DNA binding affinity (Ka ? 1 ¡Á 107 M-1) than the well-known DNA-intercalating complex [Ru(phen)2(dppz)]2+ (where dppz = dipyrido[3,2-a:2?,3?-c]phenazine).

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

Application of 144222-34-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.144222-34-4, Name is N-((1R,2R)-2-Amino-1,2-diphenylethyl)-4-methylbenzenesulfonamide, molecular formula is C21H22N2O2S. In a Article£¬once mentioned of 144222-34-4

Chiral bifunctional thiourea-phosphane organocatalysts in asymmetric allylic amination of Morita-Baylis-Hillman acetates

A series of new chiral bifunctional thiourea-phosphane catalysts was synthesized and successfully applied in the catalytic, asymmetric allylic amination of Morita-Baylis-Hillman (MBH) acetates derived from the methyl vinyl ketone (MVK) or ethyl vinyl ketone (EVK) system, with phthalimide, affording the amination products in up to over 99 % yield and 90 % ee for a wide range of substrates derived from different aromatic aldehydes. Copyright

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

Electric Literature of 20439-47-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.20439-47-8, Name is (1R,2R)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 20439-47-8

Synthesis of a novel chiral cubane-based Schiff base ligand and its application in asymmetric nitro-aldol (Henry) reactions

The first reported cubane-based chiral Schiff base ligand has been successfully synthesized. This ligand has been evaluated on the nitro-aldol (Henry) reaction. The reactions were performed in the presence of four different copper salts, using eight different solvents, and five different temperatures. The highest enantioselectivity obtained for this novel ligand was ?39% ee.

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

Chemistry is an experimental science, Recommanded Product: 65355-00-2, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 65355-00-2, Name is (S)-(-)-5,5,6,6,7,7,8,8-Octahydro-1,1-bi-2-naphthol

Synthesis of Binol-based diphosphinites bearing chiral phospholane units and their application in asymmetric catalysis

New diphosphinite ligands based on atropoisomeric diol backbones and (R,R)-2,5-dimethylphospholane moieties have been prepared and fully characterised. For each ligand structure, both diastereomers have been synthesised. These ligands are available through a straightforward procedure in good yields. The solid state structures of two diastereomeric ligands are reported. These ligands have been applied to Rh-catalysed asymmetric hydrogenations and hydroformylations of CC bonds as well as in Ir-catalysed asymmetric hydrogenations of CN bonds. Turnover frequencies in the range of 10,000 h-1 and enantioselectivities of up to 98% ee have been achieved. The different chirality elements within the ligands led to marked cooperative effect in catalysis. Interestingly, there is no general privileged diastereomeric structure but rather a matched diastereomer for each application.

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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, 52093-25-1, molcular formula is C3EuF9O9S3, introducing its new discovery. Product Details of 52093-25-1

Supramolecular self-assembly of mixed f-d metal ion conjugates

The synthesis of the novel Eu(III) cyclen complex, Eu1, is described. In buffered pH 7.4 water, the Eu(III) emission was “switched on” upon excitation of the Terpy antenna. In the presence of various transition-metal ions (e.g., Fe(II) and Ni(II)), both the singlet-excited state and the Eu(III) emission were quenched (“switched off”), whereas in the ground state, an MLCT band was formed, signifying the formation of stable mixed linear trimetallic f-d supramolecular self-assemblies.

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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, Recommanded Product: 18531-99-2, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 18531-99-2, Name is (S)-[1,1′-Binaphthalene]-2,2′-diol, molecular formula is C20H14O2. In a Article, authors is Kanayama, Takatoshi£¬once mentioned of 18531-99-2

Synthesis of beta-substituted alpha-amino acids with use of iridium-catalyzed asymmetric allylic substitution

The asymmetric synthesis of beta-substituted alpha-amino acids with use of iridium-catalyzed allylic substitution was described. The Ir-catalyzed allylic substitution of diphenylimino glycinate with allylic phosphates proceeded smoothly even at 0 C and gave branch products with high enantioselectivity (up to 97% ee), when chiral bidentate phosphite bearing the 2-ethylthioethyl group was employed. In addition, both diastereomers of the branch products were synthesized stereoselectively by simply switching the base employed. These methods were also applied to the asymmetric synthesis of quaternary alpha-amino acids.

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

Electric Literature of 18531-94-7, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18531-94-7, Name is (R)-[1,1′-Binaphthalene]-2,2′-diol, molecular formula is C20H14O2. In a Article£¬once mentioned of 18531-94-7

A homochiral microporous hydrogen-bonded organic framework for highly enantioselective separation of secondary alcohols

A homochiral microporous hydrogen-bonded organic framework (HOF-2) based on a BINOL derivative has been synthesized and structurally characterized to be a uninodal 6-connected {3355667} network. This new HOF exhibits not only a permanent porosity with the BET of 237.6 m 2 g-1 but also, more importantly, a highly enantioselective separation of chiral secondary alcohols with ee value up to 92% for 1-phenylethanol.

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

Application of 448-61-3, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 448-61-3, Name is 2,4,6-Triphenylpyrylium tetrafluoroborate, molecular formula is C23H17BF4O. In a Article£¬once mentioned of 448-61-3

Cooperative Light-Activated Iodine and Photoredox Catalysis for the Amination of Csp3 ?H Bonds

An unprecedented method that makes use of the cooperative interplay between molecular iodine and photoredox catalysis has been developed for dual light-activated intramolecular benzylic C?H amination. Iodine serves as the catalyst for the formation of a new C?N bond by activating a remote C sp3 ?H bond (1,5-HAT process) under visible-light irradiation while the organic photoredox catalyst TPT effects the reoxidation of the molecular iodine catalyst. To explain the compatibility of the two involved photochemical steps, the key N?I bond activation was elucidated by computational methods. The new cooperative catalysis has important implications for the combination of non-metallic main-group catalysis with photocatalysis.

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