Category: 20439-47-8

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Facile enantioseparation and recognition of mandelic acid and its derivatives in self-assembly interaction with chiral ionic liquids

Mandelic acid and its derivatives are important medical intermediates in the pharmaceutical industry. Different stereoisomers exhibited distinct biological properties to human bodies. Given that, enantioselective recognition and separation of mandelic acid are of great importance. In this study, four novel different types of chiral ionic liquids bearing designed functional groups were synthesized and successful enantioselective precipitation with mandelic acid and its derivatives. That is, (R, R)-chiral ionic liquid 1 can coprecipitated with S-mandelic acid and its derivatives was observed. In addition, good correlation coefficient is achieved by using electrospray mass spectrum at negative ion pattern for quick analysis of the enantioselective precipitation, which could be served as a method of enantioselective recognition. The possible intermolecular interactions are established after systematical studies by NMR spectroscopy and DFT calculations.

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

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Structure and asymmetric epoxidation reactivity of chiral Mn(III) salen catalysts modified by different axial anions

A series of chiral Mn(iii) catalysts [salen-Mn(iii)][X] (X- = Cl-, OAc-, NO3-, BF4-, CF3SO3-, OCH2CH3-) were synthesized by ion exchange. The influence of the axial anion on both the electronic structure and steric configuration of [salen-Mn(iii)][X] were carefully investigated. Besides, the reactivity and enantioselectivity of these catalysts were explored in the asymmetric epoxidation of olefins. The obtained results indicate that the axial anions have influences on both electronic structure and steric configuration of the chiral Mn(iii) salen complexes. Controlling the reactivity and enantioselectivity of these chiral Mn(iii) salen complexes can be achieved by changing the axial anions.

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Reference£º
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£¬ Safety of (1R,2R)-Cyclohexane-1,2-diamine, Which mentioned a new discovery about 20439-47-8

Synthesis of borasiloxane-based macrocycles by multicomponent condensation reactions in solution or in a ball mill

Large macrocycles containing imine and borasiloxane links are obtained in polycondensation reactions of 4-formylbenzeneboronic acid, t-Bu 2Si(OH)2, and diamines. The multicomponent reactions can be performed in solution or – advantageously – by mechanochemical syntheses in a ball mill.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Safety of (1R,2R)-Cyclohexane-1,2-diamine. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 20439-47-8

RuHCl(diphosphine)(diamine): Catalyst precursors for the stereoselective hydrogenation of ketones and imines

New chiral complexes RuHCl(diphosphine)(diamine) are readily prepared from RuHCl(PPH3)3. The diamine complexes, in the presence of alkoxide base, catalyze the hydrogenation of a wide variety of ketones and imines at 3 atm H2, 20C, including prochiral imines to chiral amines in good to excellent enantiomeric excess.

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

Application 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

Indium triflate: An efficient catalyst for acylation reactions

Indium triflate is shown to be an extremely efficient catalyst for the acylation of alcohols and amines.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of (1R,2R)-Cyclohexane-1,2-diamine. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 20439-47-8

Transition metal molecular glasses by design: Mexylaminotriazine-functionalized salicylaldehyde imine ligands

Mexylaminotriazines are a novel class of small molecules capable of forming stable glassy phases. When covalently linked to a variety of small molecules, mexylaminotriazines possess the ability to introduce resistance to crystallization and yield stable glassy phases for various other moieties that are traditionally unable to readily adopt glassy phases. To date, this has been applied particularly to opto-electronic devices. However, there is limited information regarding the synthesis of glass-forming metal complexes. Herein, a library of salicylaldehyde imine derivatives incorporating mexylaminotriazine substituents were synthesized, from which respective complexes with various first-row transition metals were prepared. The resulting compounds were characterized and evaluated for their glass-forming properties. It was found that all synthesized ligands and complexes demonstrated the ability to adopt glassy phases; however, the metal centre was identified as having a profound impact on the glass transition temperature (Tg). Additionally, it was found that the incorporation of mexylaminotriazine moieties to ligand frameworks may present a reliable and predictable strategy for the introduction of glass-forming properties into a variety of metal complexes.

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

Related Products 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

Bidentate urea-based chiral selectors for enantioselective high performance liquid chromatography: Synthesis and evaluation of “Crab-like” stationary phases

A rational approach for the design and preparation of two new “Crab-like” totally synthetic, brush-type chiral stationary phases is presented. Enantiopure diamines, namely 1,2-diaminocyclohexane and 1,2-diphenyl-1,2-ethylene-diamine were treated with 3-(triethoxysilyl)propyl isocyanate, to yield reactive ureido selectors that were eventually attached to unmodified silica particles through a stable, bidentate tether, through a facile two-step one-pot procedure. A full chemical characterization of the new materials has been obtained through solid-state NMR (both 29Si and 13C CPMAS) spectroscopy. Columns packed with the two Crab-like chiral stationary phases allow for different mechanisms of separation: normal phase liquid chromatography, reversed phase liquid chromatography and polar organic mode and show a high stability at basic pH values. In particular, the Crab-like column containing the 1,2-diphenyl-1,2-ethylene-diamine selector proved a promising candidate for the resolution of a wide range of racemates (including benzodiazepines, N-derivatized amino acids, and free carboxylic acids) both in normal phase and polar organic mode. An Hmin of 9.57 at a musf of 0.80mm/s (corresponding to 0.8mL/min) was obtained through van Deemter analysis, based on toluene, for the Crab-like column with the 1,2-diphenyl-1,2-ethylene-diamine selector (250mm¡Á4.6mm I.D.), with a calculated reduced height equivalent to a theoretical plate (h) of only 1.91. Finally, comparative studies were performed with a polymeric commercially available P-CAP-DP column in order to evaluate enantioselectivity and resolution of the Crab-like columns.

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

Reference 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 new sulfonium ylides bearing the chiral diazaphospholidine group as reagents for asymmetric cyclopropanation

Sulfonium ylides derived from chiral N,N?-substituted (benzyl, isopropyl, neopentyl) phosphonamides were prepared by reacting appropriate chiral diamidophosphites with potassium hydride and chloromethyl methyl sulfide, and then with methyl iodide in the presence AgBF4 to give the corresponding sulfonium salts in high yields. One of them was analyzed by X-ray crystallography. The salts upon treatment with different bases (LithiumDiisopropylAmine, BuLi, K2CO3) were converted in situ into ylides, which were reacted with activated olefins to produce phosphonocyclopropanes as a mixture of two diastereoisomers with moderate-to-high diastereoselectivities.

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

Electric Literature of 20439-47-8, 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.20439-47-8, Name is (1R,2R)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a article£¬once mentioned of 20439-47-8

Mixed donor aminophosphine oxide ligands in ruthenium-catalysed asymmetric transfer hydrogenation reactions

A number of mixed-donor aminophosphine ligands have been prepared and their activity and selectivity in asymmetric transfer hydrogenation reactions assessed. Enantioselectivities up to 93% and 80% were achieved for the reduction of acetophenone and propiophenone, respectively.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Formula: C6H14N2. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 20439-47-8

Synthesis and Structure of N,N?-Diaryl Derivatives of trans-1,2-Diaminocyclohexane

Synthesis of N,N?-diaryl derivatives of trans-1,2-diaminocyclohexane (DACH) by palladium-catalyzed aromatic nucleophilic substitution reactions is described. The conformation of the N-acetylated N,N?-diaryl derivatives of DACH has been studied by the computational, circular dichroism and X-ray diffraction methods. Reversal of the relative orientation of the N-aryl residues due to N-acetylation has been established.

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