Day: March 24, 2021

Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 130-95-0, Name is Quinine. In a document, author is Maurya, Abhishek, introducing its new discovery. Recommanded Product: Quinine.

Liquid-phase oxidation of olefins with rare hydronium ion salt of dinuclear dioxido-vanadium(V) complexes and comparative catalytic studies with analogous copper complexes

Homogeneous liquid-phase oxidation of a number of aromatic and aliphatic olefins was examined using dinuclear anionic vanadium dioxido complexes [(VO2)(2)((LH)-L-sal)](-) (1) and [(VO2)(2)((LH)-L-Nsal)](-) (2) and dinuclear copper complexes [(CuCl)(2)((LH)-L-sal)](-) (3) and [(CuCl)(2)((LH)-L-Nsal)](-) (4) (reaction of carbohydrazide with salicylaldehyde and 4-diethylamino salicylaldehyde afforded Schiff-base ligands [(LH4)-L-sal] and [(LH4)-L-Nsal], respectively). Anionic vanadium and copper complexes 1, 2, 3, and 4 were isolated in the form of their hydronium ion salt, which is rare. The molecular structure of the hydronium ion salt of anionic dinuclear vanadium dioxido complex [(VO2)(2)((LH)-L-sal)](-) (1) was established through single-crystal X-ray analysis. The chemical and structural properties were studied using Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis), H-1 and C-13 nuclear magnetic resonance (NMR), electrospray ionization mass spectrometry (ESI-MS), electron paramagnetic resonance (EPR) spectroscopy, and thermogravimetric analysis (TGA). In the presence of hydrogen peroxide, both dinuclear vanadium dioxido complexes were applied for the oxidation of a series of aromatic and aliphatic alkenes. High catalytic activity and efficiency were achieved using catalysts 1 and 2 in the oxidation of olefins. Alkenes with electron-donating groups make the oxidation processes easy. Thus, in general, aromatic olefins show better substrate conversion in comparison to the aliphatic olefins. Under optimized reaction conditions, both copper catalysts 3 and 4 fail to compete with the activity shown by their vanadium counterparts. Irrespective of olefins, metal (vanadium or copper) complexes of the ligand [(LH4)-L-sal] (I) show better substrate conversion(%) compared with the metal complexes of the ligand [(LH4)-L-Nsal] (II).

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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. 130-95-0, Name is Quinine, SMILES is O[C@H](C1=CC=NC2=CC=C(OC)C=C12)[C@H]3[N@@]4C[C@H](C=C)[C@](CC4)([H])C3, in an article , author is Tao, Rong, once mentioned of 130-95-0, Quality Control of Quinine.

Ligand-tuned cobalt-containing coordination polymers and applications in water

Ligands play a key role in modern catalysis research and occasionally determine whether a reaction will take place under specific conditions, such as in water. In this experiment, ligands containing an indole-based diacid moiety were employed to prepare the corresponding cobalt coordination polymer material (Co-CIA) and porous oval polymer material (Co-NCIA). Interestingly, it was observed that Co-CIA could promote the alkylation of ketones with alcohols and alcohols with alcohols, while Co-NCIA was effective for the synthesis of 1-benzyl-2-aryl-1H-benzo[d]imidazoles from various phenylenediamine and benzyl alcohols through borrowing hydrogen and dehydrogenation strategies. Other mechanism explorations, such as deuterium labeling experiments and a kinetics study, were conducted to better understand Co-CIA and Co-NCIA systems and the related transformations. Our studies provided an efficient method for the development of highly active cobalt coordination polymer materials with excellent recovery performance for dehydrogenation and borrowing hydrogen reactions under water and base-free conditions.

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

In an article, author is Kinzel, Niklas W., once mentioned the application of 3144-16-9, Recommanded Product: ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonic acid, Name is ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonic acid, molecular formula is C10H16O4S, molecular weight is 232.3, MDL number is MFCD00064157, category is catalyst-ligand. Now introduce a scientific discovery about this category.

Transition Metal Complexes as Catalysts for the Electroconversion of CO2: An Organometallic Perspective

The electrocatalytic transformation of carbon dioxide has been a topic of interest in the field of CO2 utilization for a long time. Recently, the area has seen increasing dynamics as an alternative strategy to catalytic hydrogenation for CO2 reduction. While many studies focus on the direct electron transfer to the CO2 molecule at the electrode material, molecular transition metal complexes in solution offer the possibility to act as catalysts for the electron transfer. C-1 compounds such as carbon monoxide, formate, and methanol are often targeted as the main products, but more elaborate transformations are also possible within the coordination sphere of the metal center. This perspective article will cover selected examples to illustrate and categorize the currently favored mechanisms for the electrochemically induced transformation of CO2 promoted by homogeneous transition metal complexes. The insights will be corroborated with the concepts and elementary steps of organometallic catalysis to derive potential strategies to broaden the molecular diversity of possible products.

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

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 344-25-2, Name is H-D-Pro-OH, formurla is C5H9NO2. In a document, author is Lee, Jooyeon, introducing its new discovery. Name: H-D-Pro-OH.

Strategies in Metal-Organic Framework-based Catalysts for the Aerobic Oxidation of Alcohols and Recent Progress

Metal-organic frameworks (MOFs), which are porous inorganic-organic hybrid materials, act as versatile catalyst platforms for various organic transformations. In particular, the aerobic oxidation of alcohols to the corresponding aldehydes (or ketones) has been extensively studied using various MOFs and their analogs. In this account, we summarize the performance of MOF-based catalysts for the aerobic oxidation of alcohols based on the position of the catalytic species and the type of functionalization. Moreover, recent advances in MOF-based catalysts for aerobic oxidation are discussed in terms of catalytic efficiency and substrate size discrimination.

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

Synthetic Route of 131457-46-0, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, 131457-46-0, Name is (4S,4S)-2,2-(Propane-2,2-diyl)bis(4-phenyl-4,5-dihydrooxazole), SMILES is CC(C1=N[C@@H](C2=CC=CC=C2)CO1)(C3=N[C@@H](C4=CC=CC=C4)CO3)C, belongs to catalyst-ligand compound. In a article, author is Chen, Siyuan, introduce new discover of the category.

Modulation of the charge transfer behavior of Ni(II)-doped NH2-MIL-125(Ti): Regulation of Ni ions content and enhanced photocatalytic CO2 reduction performance

Regulation of the electronic structure of metal oxo clusters in metal organic frameworks (MOFs) is a promising way to modulate charge transfer efficiency and photocatalytic performance. Herein, a series of Ni2+ doped NH2-MIL-125-Ti (NH2-MIL-125-Ni-x/Ti) with different Ni2+/Ti4+ molar ratio (x = 0.5%-1.5%) are prepared via an in-situ doping method. Correlations between the electronic structure of (Ti/Ni)(8)O-8(OH)(4) nodes and charge transfer efficiency, bandgap and energy position of band edges of the NH2-MIL-125-Ni-x/Ti are systematically investigated based on experimental and computational method. The doped Ni2+ was confirmed to be an efficient mediator to promote the electron transfer from photoexcited terephthalate ligand to the (Ti/Ni)(8)O-8(OH)(4) nodes in NH2-MIL-125-Ni-x/Ti. The NH2-MIL-125-Ni-1%/Ti exhibited the highest CO2 conversion rate with 98.6% CO selectivity and the factors affecting the photocatalytic CO2 reduction performance are also studied. It provides some guidance for developing MOFs photocatalyst with targeted performance via modification of the electronic structure of metal oxo clusters.

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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 Hsieh, Hsiang-Hua, once mentioned the application of 130-95-0, Name is Quinine, molecular formula is C20H24N2O2, molecular weight is 324.4168, MDL number is MFCD00198096, category is catalyst-ligand. Now introduce a scientific discovery about this category, Safety of Quinine.

Synthesis and molecular geometry of unique lithium isopropoxide assisted tantalum isopropoxide cluster containing bidentate N,O-ketiminate ligands

A unique cluster of lithium isopropoxide assisted tantalum isopropoxide derivative incorporating bidentate ketiminate ligand is reported and structurally characterized. Reaction between Li(OCMeCHCMeNAr) and TaCl5 in toluene at room temperature generates compound 1, (OCMeCHCMeNAr)TaCl4, in relatively high yield. Further reacting of 1 with excess amount of (LiOPr)-O-i in diethylether affords the tantalum-lithium bimetallic cluster {[Li(OCMeCHCMeNAr)]Ta((OPr)-Pr-i)(5)((LiOPr)-Pr-i)(LiCl)}(2) (2). The molecular geometry of 2 reveals as an edge-sharing bis(open-cube) that it consists two Li-Cl edge-sharing bis(open-cube)TaLi3O5Cl units in its core structure. (C) 2020 Elsevier B.V. All rights reserved.

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

Chemistry is an experimental science, Name: Cerium(III) acetate xhydrate, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 206996-60-3, Name is Cerium(III) acetate xhydrate, molecular formula is C6H11CeO7, belongs to catalyst-ligand compound. In a document, author is Zhang, Yong.

A fluorescent probe based on novel fused four ring quinoxalinamine for palladium detection and bio-imaging

A fluorescent probe based on the Tsuji-Trost reaction was developed for detecting palladium species of all the typical oxidation states (0, +2, +4). In this probe, a novel fused four-ring quinoxalinamine was firstly designed as the fluorophore. The probe displayed high selectivity towards palladium with a distinct color change in aqueous media. Non-toxic and water-soluble PEG400 was used to replace the phosphine ligands and the reducing agents. In the absence of PEG400, the probe could discriminate Pd(0) from Pd(ii) and Pd(iv) in solutions. The actual water sample detection and bio-imaging results indicated the probe’s great potential for palladium detection in both solutions and living systems.

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

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 95-13-6, Name is Indene, molecular formula is , belongs to catalyst-ligand compound. In a document, author is Zheng, Handou, Name: Indene.

Combining hydrogen bonding interactions with steric and electronic modifications for thermally robust alpha-diimine palladium catalysts toward ethylene (co)polymerization

Development of thermally robust palladium-based catalysts for (co)polymerization of ethylene and polar monomers with high activities is a continuing challenge. Combining hydrogen bonding interactions with steric and electronic modifications, dibenzobarrelene-based alpha-diimine palladium complexes with different substituents (X = OMe, H, Cl, Br, and I) have been synthesized and characterized. The steric effect of the palladium complexes was elucidated by their buried volumes, and the electronic effect of the substituents was clarified by the Hammett constants (sigma) of the substituents and H-1 NMR analysis of the Pd-bound methyl. The hydrogen bonding interactions (H center dot center dot center dot Cl and H center dot center dot center dot OMe) were confirmed by single crystal structures of chloro- and methoxy-substituted neutral and cationic palladium complexes. Contributed by the steric and electronic effects as well as the hydrogen bonding, the chloro-substituted palladium catalyst was thermally robust at temperatures as high as 100 degrees C for ethylene polymerization, while the methoxy-substituted palladium catalyst showed excellent tolerance toward high temperature and polar groups and was able to copolymerize ethylene and methyl acrylate (MA) at 80 degrees C to produce the copolymer with high MA incorporation up to 9.5 mol%.

If you are hungry for even more, make sure to check my other article about 95-13-6, Name: Indene.

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

Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 3030-47-5, Name is N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine, SMILES is CN(C)CCN(CCN(C)C)C, in an article , author is Zheng, Lei, once mentioned of 3030-47-5, Recommanded Product: 3030-47-5.

Pyridinyl-triazole ligand systems for highly efficient CuI-catalyzed azide- alkyne cycloaddition

Pyridinyl-triazole ligand systems (including N-2-2-pyridinyl 1,2,3-triazoles and N-1/N-2-substituted 2-(NH-1,2,3triazol-4-yl)pyridines) were found to be superior ligands for CuI-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. Low catalyst loadings, short reaction times, facile catalyst recyclability, ambient temperature, and open-flask conditions made this catalytic system very practical. The iodide anions could form iodine bridges to construct stable dinuclear Cu(I) complexes with these ligands, which was the key to achieve high catalytic activities. While CuBr and CuCl were not suitable for this ligand system because of the improper size of Br and Cl atoms for the formation of the corresponding dinuclear Cu(I) complexes.

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

Let¡¯s face it, organic chemistry can seem difficult to learn, COA of Formula: C5H10N2O, Especially from a beginner¡¯s point of view. Like 7531-52-4, Name is H-Pro-NH2, molecular formula is catalyst-ligand, belongs to catalyst-ligand compound. In a document, author is Mostakim, S. K., introducing its new discovery.

An Anthracene-Based Metal-Organic Framework for Selective Photo-Reduction of Carbon Dioxide to Formic Acid Coupled with Water Oxidation

A Zr-based metal-organic framework has been synthesized and employed as a catalyst for photochemical carbon dioxide reduction coupled with water oxidation. The catalyst shows significant carbon dioxide reduction property with concomitant water oxidation. The catalyst has broad visible light as well as UV light absorption property, which is further confirmed from electronic absorption spectroscopy. Formic acid was the only reduced product from carbon dioxide with a turn-over frequency (TOF) of 0.69 h(-1) in addition to oxygen, which was produced with a TOF of 0.54 h(-1). No external photosensitizer is used and the ligand itself acts as the light harvester. The efficient and selective photochemical carbon dioxide reduction to formic acid with concomitant water oxidation using Zr-based MOF as catalyst is thus demonstrated here.

If you are hungry for even more, make sure to check my other article about 7531-52-4, COA of Formula: C5H10N2O.

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