Category: 21436-03-3

Application of 21436-03-3, An article , which mentions 21436-03-3, molecular formula is C6H14N2. The compound – (1S,2S)-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Synthesis and activity of macrocyclized chiral Mn(III)-Schiff-base epoxidation catalysts

A series of chiral macrocyclic Mn(III)Salen complexes has been prepared with two salicylidene moieties linked in their 3 and 3? positions by aliphatic polyether bridges of variable lengths or by a more rigid aromatic junction arm. X-ray structures of ligand precursors and of complex 8 have been performed. All complexes have been used in the asymmetric epoxidation of 1,2-dihydronaphthalene with NaOCl as oxygen atom donor and exhibited modest enantiomeric excesses. Complex 10 was selected to be tested with two cis-disubstituted olefins and several oxidants, namely NaOCl, PhIO and n-Bu 4NHSO5. 2,2?-Dimethylchromene oxide was obtained from 2,2?-dimethylchromene with ee values of 56% and 74% when using 10 and NaOCl and PhIO, respectively.

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In an article, published in an article, once mentioned the application of 21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine,molecular formula is C6H14N2, is a conventional compound. this article was the specific content is as follows.HPLC of Formula: C6H14N2

Asymmetric synthesis of warfarin and its analogues on water

The asymmetric Michael addition of 4-hydroxycoumarin to alpha,beta-unsaturated ketones on water without organic co-solvents is reported to be catalysed by organic primary amines. The application of enantiomerically pure (S,S)-diphenylethylenediamine affords a series of important pharmaceutically active compounds in good to excellent yields (73-98%) and with good enantioselectivities (up to 76% ee) via reactions accelerated by ultrasound. In particular, our developments led to an efficient protocol for the ‘solids on water’ formation of the anticoagulant warfarin in both enantiomeric forms. The presented scalable and environmentally friendly organocatalytic approach affords the target drug in enantiomerically pure form.

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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.21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Review£¬once mentioned of 21436-03-3, Product Details of 21436-03-3

Solvothermal synthesis of Group 13-15 chalcogenidometalates with chelating organic amines

Inorganic-organic hybrid chalcogenidometalate materials have attracted considerable interest, because they are a new type of materials with unique topologic structures. The syntheses of these materials are typically carried out under hydro(solvo)thermal conditions at relatively low temperatures. Organic amines have been demonstrated to be successful and versatile molecules to be used in template-directed synthesis of numerous chalcogenide-based open-framework materials. Some comprehensive reviews have summarized the preparation and structures of the chalcogenidometalates with non-chelating amines. Extended and embedded researches on the chelating amines containing a different number of N-donor atoms have recently attracted more interest in synthetic chemistry. A series of unique inorganic-organic hybrid chalcogenidometalate materials are successfully isolated lately. This review focuses on the recent developments in solvothermal synthesis of main group chalcogenidometalates in the presence of organic chelating amines or polyamines as reaction medium. In contrast to the non-chelating amines, the roles of the chelating amines in the syntheses and the effects of the chelating amines on the crystal structures are discussed. A comprehensive outline of the chalcogenidometalate compounds with metal complex cations is also presented.

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On the Aminolysis of Bis-Imidoylchlorides of Oxalic Acid. II. Reaction with Aliphatic Diamines and Aminoalcohols

The aminolysis of bis-imidoylchloride 1 derived from oxalic acid with several diamines and aminoalcohols was investigated.At room temperature diamines 2 as well as aminoalcohols 7 give mainly the cyclic amidines 3 and mixed amidine-imidates 8 in moderately up to good yields.While cis-1,2-diaminocyclohexane yields at room temperature the bicyclic amidine 3a, the trans isomer reacts to 3b only when heated for several hours.Depending on the conditions, the racemic 1,2-diaminopropane 2h gives derivatives of pyrazine 3h or the open-chain amidine 5 resulting from an oxidative aromatization and subsequent hydrolysis.Histamine 2i and 1,8-diamino-3,6-dioxaoctane 2p react selectively with 1 to seven- respectively twelve-membered heterocycles 3i and 3p.The mixed aliphatic and aromatic diamines 2n, o show an anomalous behaviour leading to 2,2′-bis-chinazolines 3n, o.In comparison with acyclic oxalic amidines the new cyclic derivatives show less molecular dynemic in their nmr spectra.In some cases, a s-trans-arrangement of the amidine substructure was observed.

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Synthetic Route of 21436-03-3, An article , which mentions 21436-03-3, molecular formula is C6H14N2. The compound – (1S,2S)-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Expanding the limits of amide-triazole isosteric substitution in bisamide-based physical gels

Gelation of organic solvents using N,N?-((1S,2S)-cyclohexane-1,2-diyl)didodecanamide (C12-Cyc) is driven by its self-assembly via antiparallel hydrogen bonds and van der Waals intermolecular interactions. In this work we carried out a dual isosteric substitution of the two amide groups with 1,2,3-triazole rings affording the corresponding isosteric gelator (click-C12-Cyc). A detailed comparative study in terms of the gelation ability and gel properties demonstrated that the 1,2,3-triazoles can take over all of the functions derived from the amide groups offering a versatile strategy for tuning the properties of the corresponding gels. This is not an obvious outcome because the directional amide groups in C12-Cyc constitute the source of the hydrogen bonds to build the 3D self-assembled network. Furthermore, theoretical calculations revealed that click-C12-Cyc can adopt a wide variety of interacting patterns, whose relative stability depends on the polarity of the environment, this is in good agreement with the experimental data obtained regarding its gelation ability. Other important features of click-C12-Cyc for potential practical applications are its non-cytotoxic character and its phase-selective gelation of water-oil mixtures.

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Synthesis of Cr(III) Salen Complexes as Supramolecular Catalytic Systems for Ring-Opening Reactions of Epoxides

The synthesis of two conformationally restricted Cr(III) salen complexes, 2 and 3, is described. Together, they constitute a supramolecular hydrogen-bonding catalytic system for the recently reported asymmetric ring-opening reactions of epoxides by a dynamic supramolecular catalyst. The synthesis involves state-of-the art transformations in frontline synthetic chemistry applied to heterocyclic chemistry. Hence, palladium-catalyzed reactions were employed, including carbonylative annelation and Suzuki cross-coupling reactions, for the formation of one of the heterocyclic rings (quinolone) and the functionalization of the formed rings. For the construction of the second heterocyclic ring (isoquinolone), a Curtius rearrangement was employed. The corresponding salen ligands were then prepared by Schiff-base reactions, yielding the final complexes after metal insertion. For reference purposes the less conformationally restricted Cr(III) complexes 4 and 5 were also synthesized.

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Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 21436-03-3, C6H14N2. A document type is Article, introducing its new discovery., Recommanded Product: (1S,2S)-Cyclohexane-1,2-diamine

Chiral Co(III)-salen complex supported over highly ordered functionalized mesoporous silica for enantioselective aminolysis of racemic epoxides

Here we demonstrate the synthesis of a novel chiral Co(iii)-salen complex supported functionalized 2D-hexagonal mesoporous silica material Co(iii)@AFS-1. This material has shown excellent catalytic activity for the regio- and enantioselective asymmetric ring opening (ARO) of terminal and meso epoxides using various aromatic as well as cyclic amines to produce chiral beta-amino alcohols having very good enantioselectivities (ee > 99%) at ambient temperature under solvent-free neat conditions.

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21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 21436-03-3, Recommanded Product: 21436-03-3

Kinetics and mechanism of water substitution at half-sandwich iridium (III) aqua cations Cp*Ir(A-B)(H2O)2+/+ in aqueous solution (Cp* = eta5-pentamethylcyclopentadienyl anion; A-B = Bidentate N,N or N,O ligand)

The perchlorate complexes of a series of half-sandwich monoaqua cations Cp*Ir(A-B)(H2O)2+/+ with A-B = prol (D/L-proline anion), picac (picoIinic acid anion), R,R-dach [(-)-(1R,2R)-1,2-diaminocyclohexane], R,R-dpen [(+)-(1R,2R)-1,2-diphenylethylenediamine], phen (o-phenanthroIine), and bpy (2,2?-bipyridine) (Cp* = eta5-pentamethylcyclopentadienyl anion) have been prepared and characterized. An X-ray structure analysis of Cp*Ir(R,R-dach)(H2O)(ClO4)2¡¤H 2O has revealed that the cation Cp*Ir(R,R-dach)(H2O)2+ has a distorted pseudo-octahedral coordination geometry. In the case of A-B = prol, crystallization from water led to the trinuclear complex [Cp*Ir(D-prol)]3(ClO4)3, which has also been characterized by X-ray structure analysis. The experimental data suggest that in aqueous solution the trinuclear proline complex dissociates to form the cation Cp*Ir(D-prol)(H2O)+. The proton dissociation constants of the coordinated water in Cp* Ir(A-B)(H2O)2+/+ have been determined as pKa = 7.5 (A-B = bpy) and pKa = 7.1 (A-B = R,R-dach and picac). Substitution of the water in Cp*Ir(A-B)(H2O)2+/+ by the monodentate ligands L = py (pyridine), DMS (dimethyl sulfide), TU (thiourea), and monodentate anions according to the Equation Cp*Ir(A-B)(H2O)2+/+ + L ? Cp*Ir(A-B)L2+/+ + H2O has been studied by multi-wavelength stopped-flow spectrophotometry in aqueous solution at I = 0.2 M. This kinetic investigation, carried out at different concentrations, temperatures, and pressures, showed that the process obeys second-order kinetics, where rate = kL[Cp*Ir(A-B)H2O2+/+][L]. The magnitude of the second-order rate constant kL depends on the nature of both A-B and L. The data for kL have been found to range from 6.4 ¡Á 104 M-1S-1 (A-B = D-prol; L = TU) to 10.5 M-1S-1 (A-B = bpy; L = py) at 298 K. The activation parameters for water substitution at Cp*Ir(A-B)(H2O)2+/+ (A-B = bpy, R,R-dach, and picac) by L = TU have been evaluated. The activation volumes of DeltaV? = +2.3, +7.4, and +7.3 cm3 mol-1, respectively, are supportive of an Id mechanism. The results regarding the kinetic lability of the coordinated water in the monoaqua cations Cp*Ir(A-B)(H2O)2+/+ are compared to those obtained for the triaqua cation Cp*Ir(H2O)32+.

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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. 21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 21436-03-3, Quality Control of: (1S,2S)-Cyclohexane-1,2-diamine

New chiral thiophene-salen chromium complexes for the asymmetric Henry reaction

Chiral thiophene-salen chromium complexes were investigated in their monomeric form as soluble catalysts in the enantioselective Henry reaction of several aldehydes. The anodic polymerization of one complex led to an insoluble powder that was successfully used as a heterogeneous catalyst for the transformation of 2-methoxybenzaldehyde with enantiomeric excesses up to 77%. The polymerized catalyst was recovered and also recycled in an original multisubstrate procedure

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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.21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 21436-03-3, HPLC of Formula: C6H14N2

Simultaneous determination of both the enantiomeric composition and concentration of a chiral substrate with one fluorescent sensor

A fluorescent sensor is discovered to exhibit high sensitivity at one emission wavelength and high enantioselectivity at another when treated with a chiral diamine. By using this fluorescent sensor, it is demonstrated for the first time that both the concentration and enantiomeric composition of a chiral substrate can be determined simultaneously with one fluorescence measurement.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.HPLC of Formula: C6H14N2, you can also check out more blogs about21436-03-3

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