Category: chiral-catalyst

In an article, published in an article, once mentioned the application of 23190-16-1, Name is (1R,2S)-(?)-2-Amino-1,2-diphenylethanol,molecular formula is C6H5CH(NH2)CH(C6H5)OH, is a conventional compound. this article was the specific content is as follows.Computed Properties of C6H5CH(NH2)CH(C6H5)OH

Highly enantioselective diethylzinc addition to imines employing readily available N-monosubstituted amino alcohols.

An easily accessible chiral ligand 3c, which promoted diethylzinc addition to imines with 96-98% ee, has been found by finely screening N,N-disubstituted and N-monosubstituted amino alcohols. N-monosubstituted amino alcohols, on average, gave slightly higher enantioselectivities than their N,N-disubstituted analogues. These results imply that the restricted and rigid structure of amino alcohol is not the absolute requirement for the highly enantioselective dialkylzinc addition to diphenylphosphinoylimines. [structure: see text]

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Related Products of 21436-03-3, 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.

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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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. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7, Recommanded Product: Dibenzo-18-crown-6

Spectroscopic study of charge transfer complexes of some benzo crown ethers with ?-acceptors DDQ and TCNE in dichloromethane solution

Formation of the charge transfer complexes between benzo-15-crown-5, dibenzo-18-crown-6, dibenzo-24-crwon-8 and dibenzo-30-crown-10 and the ?-acceptors DDQ and TCNE in dichloromethane solution was investigated spectrophotometrically.The molar absorptivities and formation constants of the resulting 1:1 molecular complexes were determined.The stabilities of the complexes of both ?-acceptors vary in the order DB18C6 > DB30C10 ca./= DB24C8 > B15C5.All of the resulting complexes were isolated in crystalline form and characterized.The influence of potassium ion on the formation and stability of the TCNE molecular complexes were studied.Effects of the crown ether structure of the K+ ion on the formation of charge transfer complexes is discussed.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Recommanded Product: Dibenzo-18-crown-6. In my other articles, you can also check out more blogs about 14187-32-7

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Related Products of 1436-59-5, 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. 1436-59-5, C6H14N2. A document type is Article, introducing its new discovery.

Stabilized Ru[(H2O)6]3+ in Confined Spaces (MOFs and Zeolites) Catalyzes the Imination of Primary Alcohols under Atmospheric Conditions with Wide Scope

Imines are ubiquitous intermediates in organic synthesis, and the metal-mediated imination of alcohols is one of the most direct and simple methods for their synthesis. However, reported protocols lack compatibility with many other functional groups since basic supports/media, pure oxygen atmospheres, and/or released hydrogen gas are required during reaction. Here we show that, in contrast to previous metal-catalyzed methods, hexa-aqueous Ru(III) catalyzes the imination of primary alcohols with very wide functional group tolerance, at slightly acid pH and under low oxygen atmospheres. The inorganic metal complex can be supported and stabilized, integrally, within either faujasite-type zeolites (Y and X) or a metal organic framework (MOF), to give a reusable heterogeneous catalyst which provides an industrially viable process well below the flammability limit of alcohols and amines.

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Reference of 1436-59-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 1436-59-5, Name is cis-Cyclohexane-1,2-diamine

Temperature-induced self-assembly of two kinds Zn(II)-based coordination polymers with luminescence properties for application in sensing and adsorption

Temperature-induced self-assembly of coordination polymers (CPs) is of great importance for structural tunability and is quite necessary for further research on structure-property relationships. Two types of CPs {[Zn(L)(DMF)]¡¤3DMF}n (1) (H2L = 4,4?-(trans-cyclohexane-1,2 diyl)bis(azanediyl)bis(carbonyl)dibenzoic acid, DMF = N,N-dimethylformamide) and {ZnL}n (2) are synthesised by the reaction of Zn(NO3)2¡¤6H2O with H2L at different reaction temperatures. CP 1 with a one-dimensional structure is obtained at room temperature, 35 C and 45 C. CP 2 with a two-dimensional structure is prepared by heating at 75 C. When the temperature is further increased to 85 C, 95 C, 105 C and 120 C, CP 2 could still be obtained. Considering the decomposition of ligands and carbonization of solvents at high temperature, 120 C is chosen as the temperature endpoint in the experiment. Single crystal X-ray diffraction analysis indicates that 1 has a chain structure formed by binuclear metal clusters and a bridged carboxylate group. It also indicates that 2 shows a layered structure formed through intermolecular interactions between two adjacent chain motifs. The luminescence properties of 1 and 2 are explored at room temperature in the solid-state. The luminescence intensities of 1 and 2 are weak due to the N-H vibration of the ligand. In order to improve their luminescence properties, we attempt to introduce lanthanide(iii) ions into their channels. Only 2 can accept lanthanide ions Eu3+ and Tb3+ and still maintain its framework, as confirmed by PXRD. Besides, 2 can also sensitize them well. Therefore, the luminescence properties of 2 are improved vastly. The doped material can emit bright red and green light of Eu3+ and Tb3+. A series of EuxTb(1-x)@ZnL coordination polymers are prepared using a post-synthesis method to realize white light emission. The luminescent material Tb3+@ZnL shows a highly sensitive quenching effect to acetone among common solvents. The characteristic emission of Tb3+ could be quenched in the presence of 8 vol% acetone. In addition, 2 could selectively adsorb methylene blue (MB) due to its porosity and can act as a green adsorbent. Compared to 1, 2 is a promising multifunctional material for applications in photoluminescence, luminescent detection and dye adsorption.

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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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Related Products of 1436-59-5, An article , which mentions 1436-59-5, molecular formula is C6H14N2. The compound – cis-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Synthesis of porous organic cage CC3 via solvent modulated evaporation

We demonstrate a Humidity Modulated Solvent Evaporation (HMSE) approach to promote the nucleation and growth of CC3 crystals. This approach relies on the gradual evaporation of dichloromethane (solvent) from a diluted concentration of CC3 precursors deposited on aluminum foil. The slow solvent evaporation allowed enough time for the organization and formation of CC3 porous organic cage. The solvent diffusion rate was modulated by the relative humidity in the system. The slow kinetics implied during the development of CC3 phase, allowed the formation of CC3 crystals. HRTEM, SAED, SEM, and XRD patterns were used as pivotal characterization techniques to follow and confirm the formation of CC3 crystals.

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Synthetic Route of 94-91-7, An article , which mentions 94-91-7, molecular formula is C17H18N2O2. The compound – N,N’-Bis(salicylidene)-1,2-propanediamine played an important role in people’s production and life.

New unsymmetrical oxovanadium(IV) complexes of mixed-donor amido and oxo ligands

The novel, unsymmetrical, mixed-donor, tetradentate amido, and oxo complexes of V(IV) of the general formula VOLx were synthesized by a nontemplate method and characterized by physico-chemical methods. The ligands were prepared by a two-stage aldol condensation reaction in the molar ratio 1:1 of 2-hydroxybenzaldehyde, 2?-hydroxyacetophenone, or 2?,4?- dihydroxyacetophenone and 1,2-diaminopropane of the general formula HA x (x = 1-3) as precursors. The tetradentate mixed donor ligands of the general formula H2Lx (x = 1-6) were obtained by condensation reaction of precursors with appropriate ketone or aldehyde. The synthesis of the ligand system, described here, is an efficient and easy method with the advantages of high yield, selectivity, and short reaction times. Only a brown polymeric form was obtained for VOL2 and green monomeric forms were obtained for VOLx, x = 1, 3-5, while in the presence of strong field ligands only monomeric forms were obtained. These observations suggest that monomeric forms of oxovanadium(IV) complexes exhibit a coordination number of five with N2O3 donor sets and the polymeric form exhibits a coordination number of six with N2O4 donor sets. Analytical data, 1H NMR, IR, UV-VIS spectra, and elemental analyses confirm the nature of the products.

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Application 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, properties, and reactivity of palladium and nickel NHC complexes supported by combinations of allyl, cyclopentadienyl, and indenyl ligands

The synthesis of a series of Pd and Ni complexes containing combinations of 2-methylallyl (C4H7), cyclopentadienyl (C 5H5, Cp), and indenyl (C7H9, Ind) ligands is reported. In all cases these complexes are supported by the electron-donating N-heterocyclic carbene ligand 1,3-bis(2,6-diisopropylphenyl)- 1,3-dihydro-2H-imidazol-2-ylidene (IPr). The mixed Cp/2-methylallyl complexes (eta1-Cp)(eta3-2-methylallyl)Pd(IPr) ( CpAllPd) and (eta5-Cp)(eta1-2-methylallyl) Ni(IPr) (CpAllNi) were synthesized through the reaction of IPr with (Cp)(2-methylallyl)M (M = Ni, Pd). The binding mode of the ligands is different in the two complexes, and as a result the total valence electron count around the metal is 18 for the Ni complex and only 16 for the Pd species. In the case of Pd, an analogue of CpAllPd containing an indenyl ligand, (eta1-Ind)(eta3-2-methylallyl)Pd(IPr) ( IndAllPd), was synthesized through the reaction of (eta3-Ind)Pd(IPr)Cl (IndClPd) with (2-methylallyl) magnesium chloride. The corresponding Ni complex (eta5-Ind) (eta1-2-methylallyl)Ni(IPr) (IndAllNi) could not be isolated. The binding modes of the ligands in the mixed indenyl/Cp complexes (eta1-Ind)(eta5-Cp)M(IPr) (M = Ni ( IndCpNi), Pd (IndCpPd)) were the same for both Ni and Pd. IndCpPd was prepared through the reaction of IndClPd with NaCp, while IndCpNi was synthesized through the reaction of (eta5-Cp)Ni(IPr)Cl (CpClNi) with lithium indenyl. Similarly, the structures of the bis(Cp) complexes (eta5-Cp) (eta1-Cp)Ni(IPr) (CpCpNi) and (eta5-Cp) (eta1-Cp)Pd(IPr) (CpCpPd) were identical for the two different metals. In contrast to CpCpPd, which is an 18-electron complex, the related bis(indenyl) Pd complex (eta3-Ind) (eta1-Ind)Pd(IPr) (IndIndPd) is a 16-electron species, while no Ni analogue of IndIndPd was characterized. Preliminary reactivity studies with electrophiles indicate that, in all systems with mixed ligands, the eta1-ligand is nucleophilic and reacts selectively. The complexes CpAllPd, CpAllNi, CpCpPd, CpCpNi, IndClPd, IndAllPd, and IndIndPd were characterized by X-ray crystallography.

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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.1436-59-5, Name is cis-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 1436-59-5, name: cis-Cyclohexane-1,2-diamine

Hydrolysis of the amide bond in N-acetylated l-methionylglycine catalyzed by various platinum(II) complexes under physiologically relevant conditions

The hydrolytic reactions between various Pt(II) complexes of the type [Pt(L)Cl2] and [Pt(L)(CBDCA-O,O?] (L is ethylenediamine, en; (¡À)-trans-1,2-diaminocyclohexane, dach; (¡À)-1,2-propylenediamine, 1,2-pn and CBDCA is the 1,1-cyclobutanedicarboxylic anion) and the N-acetylated l-methionylglycine dipeptide (MeCOMet-Gly) were studied by 1H NMR spectroscopy. All reactions were realized at 37 C with equimolar amounts of the Pt(II) complex and the dipeptide at pH 7.40 in 50 mM phosphate buffer in D2O. Under these experimental conditions, a very slow cleavage of the Met-Gly amide bond was observed and this hydrolytic reaction proceeds through the intermediate [Pt(L)(H2O)(MeCOMet-Gly-S)]+ complex. In general, it can be concluded that faster hydrolytic cleavage of the MeCOMet-Gly dipeptide was observed in the reaction with the chloride complex than with corresponding CBDCA Pt(II) complexes. The steric effects of the Pt(II) complex on the hydrolytic cleavage of the amide bond in the MeCOMet-Gly dipeptide were also investigated by 1H NMR spectroscopy. It was found that the rate of hydrolysis decreases as the steric bulk of the CBDCA and chlorido Pt(II) complexes increase (en > 1,2-pn > dach). These results contribute to a better understanding of the toxic side effects of Pt(II) antitumor drugs and should be taken into consideration when designing new potential Pt(II) antitumor drugs with preferably low toxic side effects.

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.name: cis-Cyclohexane-1,2-diamine, you can also check out more blogs about1436-59-5

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