Category: 250285-32-6

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Regioselective allene hydrosilylation catalyzed by N-heterocyclic carbene complexes of nickel and palladium

Regioselective methods for allene hydrosilylation have been developed, with regioselectivity being governed primarily by the choice of metal. Alkenylsilanes are produced via nickel catalysis with larger N-heterocyclic carbene (NHC) ligands, and allylsilanes are produced via palladium catalysis with smaller NHC ligands. These complementary methods allow either regioisomeric product to be obtained with exceptional regiocontrol.

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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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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

Cu2O: A versatile reagent for base-free direct synthesis of nhc-copper complexes and decoration of 3D-MOF with coordinatively unsaturated NHC-copper species

A new and direct synthetic route for N-heterocyclic carbene (NHC)-copper complexes was disclosed by heating imidazolium halides with Cu2O. The related synthetic procedure was quite simple and the product easily separable from the reaction mixture by simple filtration. Ultimately, this reaction was successfully applied to decorate three-dimensional (3D)-metal organic frameworks (MOFs) with coordinatively unsaturated NHC-copper species

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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.

Synthesis of Heterobiaryls Featuring 1,4 N?S Inter-Ring Interactions

Because of its low-lying sigma? orbitals, the C-S bond can interact with electron donors. In this short review, our goal is to focus on intramolecular interactions between bivalent sulfur and basic nitrogen atoms. In particular, we will consider the synthesis of selected heterobiaryls for which 1,4 N?S inter-ring interactions can be identified from X-ray diffraction data. Finally, we will briefly touch on the use of such conformational preferences in various applications. 1 Introduction 2 Cross-Coupling with C-C Bond Formation 3 Cross-Coupling with C-N Bond Formation 4 Nucleophilic Addition to Azine Followed by Oxidation 5 Multicomponent Reactions 6 Heterobiaryl Formation by Azine Building 7 Heterobiaryl Formation by Building of the Sulfur-Containing Heterocycle 8 Cycloaddition Reactions 9 Other Syntheses 10 Conclusion.

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Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, category: chiral-catalyst.

Pyrene-based bisazolium salts: From luminescence properties to Janus-type bis-N-heterocyclic carbenes

A series of pyrene-based bisazolium salts have been obtained starting from 4,5,9,10-tetrabromo-2,7-di-tert-butylpyrene. The synthetic procedure to the pyrene-bisazoliums (PBIs) reveals an unexpected behavior, as a consequence of the presence of the alkyl groups (alkyl=Me, Et, n-Pr, and n-Bu) coming from the trisalkoxyformate in the final products, instead of the expected tBu of tAmyl groups from the starting tetra-aminated pyrenes. All bisazoliums show fluorescence properties, with emissions in the range of 370-420 nm, and quantum yields ranging from 0.29 to 0.41. The PBIs were used as bis-NHC precursors in the preparation of a series of dirhodium and diiridium complexes, which have been fully characterized. The electrochemical studies on selected dimetallic complexes reveal that the electronic communication between the metals through the polyaromatic linker is negligible. Shining examples: A family of luminescent pyrene-based bisazolium salts has been obtained (see figure). The bisazoliums generate Janus-type bis-N-heterocyclic carbenes (bis-NHC), which were coordinated to rhodium and iridium.

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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, Computed Properties of C27H37ClN2

A novel zinc based binary catalytic system for CO2 utilization under mild conditions

Herein we report the development of a novel binary catalytic system for the addition of CO2 to epoxides based on zinc iodide and an imidazolium salt. The influence of the nature of the imidazolium ion and the anion has been studied in a test reaction. The optimized system exhibits excellent activity and selectivity. Furthermore, the reaction can be performed under very mild (30 C) and solvent free conditions yielding the desired cyclic carbonates in up to 99%.

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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, Computed Properties of C27H37ClN2

Synthesis, structure, and solution dynamics of pentamethylcyclopentadienyl nickel complexes bearing N-heterocyclic carbene ligands

Neutral pentamethylcyclopentadienyl nickel complexes of general formula [Ni(NHC)X(eta5-C5Me5)] [NHC = 1,3-dimethylimidazol-2-ylidene (Me-NHC), 1,3-bis(2,4,6,-trimethylphenyl) imidazol-2-ylidene (Mes-NHC), 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene (iPr-NHC); X = Cl, I] were prepared from the reaction of pentamethylcyclopentadienyl acetylacetonate nickel(II) with 1 equiv of the corresponding imidazolium salt (NHC¡¤HX). The new complexes [Ni(Me-NHC)I(eta5-C5Me5)] 1a, [Ni(Mes-NHC)Cl(eta5C5Me5)] 2, and [Ni(iPr-NHC)Cl(eta5-C5Me5)] 3 were obtained in moderate to good yields and were fully characterized by 13C and 1H NMR spectroscopy, and in the cases of la and 2 by single-crystal X-ray crystallography. The related cyclopentadienyl complex [Ni(Me-NHC) I(eta5-C5Me5)] 1b was also synthesized and structurally characterized; its geometry and spectroscopic data are comparable to those of complex la. The variable-temperature (VT) 1H NMR spectra of the sterically constrained complexes 2 and 3 are consistent with restricted rotation about the nickel-carbene carbon bond. The free energy of activation for the dynamic processes, in both cases, was determined to be on the order of 65-67 kJ mol-1 by VT NMR experiments.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Computed Properties of C27H37ClN2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 250285-32-6, in my other articles.

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Chiral Catalysts,
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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

Carbene adduct of cyclopalladated ferrocenylimine: Efficient catalyst for the Suzuki coupling of sterically hindered aryl chlorides with a weaker base and low catalyst loading

One-pot synthesis of the N,N?-bis(2,6-diisopropylphenyl)imidazol-2-ylidene (IPr) adduct of cyclopalladated ferrocenylimine complex 1 has been described. This complex has been successfully applied to Suzuki coupling reaction. Various aryl chlorides and boronic acids can be coupled efficiently with a mild base K3PO4¡¤7H2O and low catalyst loadings. This system has been proven to be compatible with the sterically hindered aryl chlorides and some boronic acids leading to form di- and tri-ortho-substituted biaryls in high yields.

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Chiral Catalysts,
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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, category: chiral-catalyst

A mechanistic insight into the organocatalytic properties of imidazolium-based ionic liquids and a positive co-solvent effect on cellulose modification reactions in an ionic liquid

Detailed insights into the organocatalytic properties of imidazolium-based ionic liquids (Im-ILs) for transesterification of cellulose with isopropenyl acetate (IPA) are presented. According to model transesterification reactions and their computational analysis, acetate anions of Im-ILs play an essential role in the promotion of the reactions. Mechanistic considerations in the optimization of the protocol of IL-catalyzed transesterification reactions have enabled a significant improvement in reaction conditions and a positive co-solvent effect for cellulose modifications in an imidazolium acetate ionic liquid.

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