Category: 250285-32-6

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The three dinuclear silver(I) complexes of N-heterocyclic carbene (NHC) ligands, [Ag2(L-1a)](PF6)2·2CH3CN (Ag-1a), [Ag2(L-2)2](PF6)2·H2O (Ag-2), and [Ag2(L-4)2](PF6)2·2CH3CN (Ag-4), were synthesized by reactions of Ag2O with the corresponding PF6 ? salt of the NHC precursors indicated as H4L-1(PF6)4, H2L-2(PF6)2, and H2L-4(PF6)2. H4L-1(PF6)4, which is the precursor of ligand L-1, was formed as mixed crystals of two geometric isomers, i.e., H4L-1a(PF6)4 (major) and H4L-1b(PF6)4 (minor), each of which was not isolated as single species. Ag2O reacted with the mixed isomers of H4L-1(PF6)4 to give a single, pure crystalline silver(I) complex Ag-1a with one isomer (L-1a) as the major product. The molecular structures of the precursors and their silver(I) complexes were determined by X-ray crystallography. A mononuclear NHC-silver(I) complex (Ag-3) was prepared by the reaction of Ag2O with the precursor HL-3Cl. The silver(I) complexes and NHC precursors prepared here were characterized by CHN elemental analysis, FTIR, Thermogravimetry/Differential thermal analysis, X-ray crystallography and solution (1H and 13C) NMR spectroscopy. Organometallic silver(I) complexes Ag-1a, Ag-2, and Ag-4 were dinuclear C?Ag?C bonding complexes, whereas Ag-3 was a mononuclear C?Ag?Cl bonding complex. These complexes are highly soluble in organic solvents such as acetone, acetonitrile, and dimethyl sulfoxide, and light-stable in the solid-state and in solution over one year. The antimicrobial activities of four silver(I) complexes and their NHC precursors against selected bacteria, yeasts, and molds in water-suspension systems were evaluated via the minimum inhibitory concentration; the activities were strongly dependent on the molecular structures of the dinuclear silver(I) complexes, which suggests a structure-activity relationship.

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Related Products of 250285-32-6, An article , which mentions 250285-32-6, molecular formula is C27H37ClN2. The compound – 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride played an important role in people’s production and life.

Neutral Nickel(II) Complexes Bearing Aryloxide Imidazolin-2-imine Ligands for Efficient Copolymerization of Norbornene and Polar Monomers

A series of novel aryloxide imidazolin-2-imine bidentate neutral Ni(II) complexes with different substituents on the imidazolin-2-imine ligand were synthesized and characterized. The complex Ni2 bearing a 2,6-diisopropylphenyl substituent adopted an almost square planar geometry, while the bulkier 2,6-bis(diphenylmethyl)-4-methylphenyl substituent ligated complex Ni3 was obtained in an allyl adduct base-free eta3 coordination mode. In the presence of B(C6F5)3, these Ni(II) complexes exhibited remarkably high activity (up to 2.7 ¡Á 107 g of PNB (mol of Ni)-1 h-1) and particularly good thermal stability toward the addition polymerization of norbornene. Most importantly, these catalysts were able to promote the direct copolymerization of norbornene with various polar monomers with high activity (?105 g (mol of Ni)-1 h-1), reasonable comonomer incorporation (0.14-3.08%), and high copolymer molecular weight (Mn up to 2.0 ¡Á 105). The strategy of installing a strongly electron donating imidazolin-2-imine ligand on the nickel complex demonstrates a great advantage for the copolymerization of an olefin with polar monomers.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Article£¬once mentioned of 250285-32-6, HPLC of Formula: C27H37ClN2

Nickel(0)/N-heterocyclic carbene complexes catalysed arylation of aromatic diamines

Nickel complexes of N-heterocyclic carbenes were examined for effecting C-N coupling reactions between aromatic diamines and aryl chlorides of varying electron density. The Ni(0) ? 2IPr (IPr = N,N?-bis(2,6- diisopropylphenyl)imidazol-2-ylidene) complex associated to t-BuONa allowed N,N?-diarylation at 100 C in 1,4-dioxane with excellent yields. Selective monoarylation of diamines could be performed in THF at 65 C.

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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. 250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Article£¬once mentioned of 250285-32-6, Formula: C27H37ClN2

Synthesis, characterization and catalytic activity of stable [(NHC)H][ZnXY2] (NHC?=?N-Heterocyclic carbene, X, Y?=?Cl, Br) species

The synthesis and characterization of imidazol(in)ium-based zinc(II) halide salts are reported. These compounds present interesting structural features and exhibit high stability. Their catalytic activity was explored in the methylation of amines with CO2 and PhSiH3.

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Synthetic Route of 250285-32-6, 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.250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a patent, introducing its new discovery.

Determining the pi-acceptor properties of n-heterocyclic carbenes by measuring the 77Se NMR chemical shifts of their selenium adducts

A new method for the assessment of the pi-acceptor strength of N-heterocyclic carbenes is presented. The 77Se chemical shifts of the easily available selenium carbene adducts 1¡¤Se-7¡¤Se correlate with the pi-acceptor character of the respective carbenes. The observed delta(77Se) values cover a range of almost 800 ppm, with increasing pi-acidity leading to a downfield shift of the signal.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Article£¬once mentioned of 250285-32-6, Computed Properties of C27H37ClN2

Molecular design exploiting a fluorine gauche effect as a stereoelectronic trigger

Acyclic conformational control often relies on destabilising noncovalent interactions to give rise to predictable conformer populations. Pertinent examples of such strategies include allylic strain (A1,2 and A 1,3) and syn-pentane interactions. However, the incorporation of fluorine vicinal to an electron-withdrawing group (F-Cbeta-C alpha-X) can lead to predictable conformations as a consequence of stabilising hyperconjugative and/or electrostatic interactions. Herein, we describe the application of a fluorine gauche effect to predictably control torsional rotation in a class of fluorinated 4-(dimethylamino)pyridine (DMAP) analogues. Intramolecularisation, such as protonation or acylation, generates an electropositive nitrogen centre vicinal to the fluorine atom at a molecular hinge (F-Cbeta-Calpha-N+); this is the only rotatable sp3-sp3 bond. In so doing, this “substrate binding” triggers a conformational change akin to the induced fit process inherent to enzymatic systems. Herein, we validate this design approach to control molecular space. A number of X-ray structures are documented that display this gauche preference (phiNCCF ? 60). Preliminary catalysis experiments are disclosed together with a kinetic and reactivity analysis. The fluorine gauche effect was used to control torsional rotation in fluorinated dimethylamino pyridine (DMAP) analogues. Upon “substrate binding” an electropositive nitrogen centre vicinal to the fluorine atom at a molecular hinge (F-Cbeta-Calpha-N+) triggers a conformational change akin to those induced in enzymatic systems. Catalysis experiments and kinetic and reactivity studies are disclosed. Copyright

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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. 250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Article£¬once mentioned of 250285-32-6, Product Details of 250285-32-6

Two-step solid-state synthesis of PEPPSI-type compounds

The two-step mechanochemical preparation of carbene-pyridine complexes of palladium and platinum is reported. The organometallic products, which represent a class of commercially available catalysts, are rapidly formed in excellent yield proving solvent-free synthesis to be a viable synthetic alternative even in the case of NHC-containing compounds.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Patent£¬once mentioned of 250285-32-6, Product Details of 250285-32-6

PROCESS TO OBTAIN A TRIFLUOROMETHYLATING COMPOSITION

Process to obtain a trifluoromethylating composition which comprises the reaction between a copper (I) source and a base in the presence of a solvent and between the resulting cuprating reagent with fluoroform.

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Synthetic Route of 250285-32-6, An article , which mentions 250285-32-6, molecular formula is C27H37ClN2. The compound – 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride played an important role in people’s production and life.

PROCESS FOR PRODUCING ALPHA-KETOCARBOXYLIC ACID

The present invention relates to a process for producing an alpha-ketocarboxylic acid, comprising a step of oxidizing an alpha-ketoaldehyde by mixing a base, carbon dioxide, the alpha-ketoaldehyde and a compound represented by formula (2-1).

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250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 250285-32-6, Product Details of 250285-32-6

Simplified preparation of copper(I) NHCs using aqueous ammonia

The use of aqueous ammonia as a coordinating and basic reagent for the metalation of imidazol(in)ium salts derived from (S)IPr and (S)IMes with simple inorganic copper precursors is reported. The synthesis of copper carbene complexes was performed using aqueous/alcoholic media in mild conditions (room temperature to 60 C) with short reaction times. Heteroleptic bromide and iodide complexes could be prepared efficiently for (S)IPr, while chloride complexes were easily accessible for SIMes and (S)IPr. Ammonia also allowed the efficient synthesis of homoleptic [Cu(NHC)2](Y) (NHC = (S)IMes; Y = PF 6, BF4) species by a variant procedure in ethanol.

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