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A series of new squaramide-based organocatalysts were synthesized from commercially available 3,4-dimethoxycyclobut-3-ene-1,2-dione in two steps. A 2.5 mol-% loading of the organocatalyst successfully catalyzed the asymmetric allylation of isatins with allyltributyltin to give the corresponding 3-allyl-3-hydroxyoxindoles in high yields and enantioselectivities (up to 98% ee).

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

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A new insight into the highly enantioselective (up to > 99.5% ee ) epoxidation of olefins in the presence of chiral titanium(IV) salan complexes is reported. A series of 14 chiral ligands with varying steric and electronic properties have been designed, and it was found that electronic effects modulate the catalytic activity (without affecting the enantioselectivity), whereas the steric properties account for the enantioselectivity of the epoxidation. Competitive oxidations of p-substituted styrenes reveal the electrophilic nature of the oxygen-transferring active species, with a Hammett 1 value of -0.51; the enantioselectivity is unaffected by the electron-donating (or withdrawing) ability of the p-substituents. Mechanistic studies provide evidence in favor of a stepwise reaction mechanism: in the first (rate-determining) stage, olefin most probably coordinates to the active species, followed by intramolecular enantioselective oxygen transfer. The enantioselectivity increases with decreasing temperature. The modified Eyring plots for the epoxidation of styrene and (Z)-beta -methylstyrene are linear, indicating a single, enthalpy-controlled mechanism of stereoselectivity, with deltadelta H ?6 = -6.6 kJmol-1 and -5.4 kJmol-1, respectively.

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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

Eight, six, and four optical isomers of diamine hexols 3>6+ containing meso-2,3-butanediamine, (R)-1,2-propanediamine, and (R,R)-1,2-cyclohexanediamine, respectively, were separated by column chromatography.The absorption and CD (circular dichroism) spectra were measured in the visible and ultraviolet regions in 0.01 mol dm-3 HCl, the absolute configurations being determined mainly on the basis of the CD spectra.Assuming that the configurational chiralities are identical to those of the corresponding ethylenediamine hexol isomers, it has been established that the lel and ob orientations of the (R)-diamine ligand show different vicinal CD curves due to the asymmetric carbon atom in the ligand.

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

Reference of 20439-47-8, In heterogeneous catalysis, the catalyst is in a different phase from the reactants. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 20439-47-8, name is (1R,2R)-Cyclohexane-1,2-diamine. In an article，Which mentioned a new discovery about 20439-47-8

A simple and convenient one-pot method for the reductive N-alkylation of (R,R)-trans-1,2-diaminocyclohexane by prochiral ketones using a Ti(OiPr)4/NaBH4 system to obtain the corresponding alkyl amine derivatives in 76-95% yields with good diastereoselectivity (dr = up to 23:1:1) is reported.

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

Application of 20439-47-8, In heterogeneous catalysis, the catalyst is in a different phase from the reactants. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 20439-47-8, name is (1R,2R)-Cyclohexane-1,2-diamine. In an article，Which mentioned a new discovery about 20439-47-8

Copper(ii) (1Cu-21Cu) and previously established experimental anticancer platinum(ii) metallointercalator complexes (1 Pt-16Pt) have been prepared and investigated for their antimicrobial properties. These complexes are of the general structure [M(I L)(AL)]2+ where IL represents functionalised 1,10-phenanthrolines (1IL-10IL), and A L represents 1,2-diaminoethane, 1S,2S- or 1R,2R-diaminocyclohexane. The structures of synthesised complexes were confirmed using a combination of elemental analysis, UV spectrometry, circular dichroism, 1H and [1H-195Pt]-HMQC NMR, X-ray crystallography, and electrospray ionisation mass spectrometry and where appropriate. Crystallisation attempts yielded single crystals of [Cu(4-methyl-1,10-phenanthroline)(1R,2R- diaminocyclohexane)](ClO4)2 (4Cu), [Cu(5,6-dimethyl-1,10-phenanthroline)(1R,2R-diaminocyclohexane)(H 2O)](ClO4)2·1.5H2O (10 Cu) and [Cu(5,6-dimethyl-1,10-phenanthroline)3](ClO 4)2·5,6-dimethyl-1,10-phenanthroline·2H 2O (21Cu). Growth inhibition of liquid cultures of bacteria (Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa), and yeast (Saccharomyces cerevisiae) discerned the most antimicrobially potent metal complexes ?20 muM, as well as that of their intercalating ligands alone. To further investigate their mode of antimicrobial activity, membrane permeabilisation caused by selected complexes was visualised by means of a cell viability kit under fluorescence microscopy.

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Reference：
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 Patent，once mentioned of 20439-47-8

Novel organic compounds of the formula STR1 Where R1 and R2 are individually selected from the group consisting of hydrogen and alkyl(C1 -C6); or R1 and R2 taken together are selected from the group consisting of STR2 where n is an integer 3-6, STR3 where m is an integer 3-6, and STR4 and L is selected from the group consisting of –O–, –CH2 –, STR5 where R3 is alkyl(C1 -C6) or –CH2 CH2 OH, which have antineoplastic activity, compositions containing the compounds and method of using the compounds to treat tumors in mammals.

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Reference：
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

Bis(thiophosphinic amidate) complexes (i.e., 1) of representative group 3 and lanthanide metals have been quantiatively prepared in situ from the corresponding thiophosphinic amides and Ln[N(TMS)2]3. These unusual pentacoordinate complexes exhibit very high activity as catalysts for intramolecular alkene hydroamination. Copyright

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

Synthetic Route 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

The first bifunctional thiourea catalyzed asymmetric Michael addition reactions of nitroalkanes to 2-furanones are described. The highly functionalized gamma-lactones with two or three consecutive stereogenic carbons were obtained in high yields (up to 99%), high diastereoselectivities (up to >20: 1 dr) and enantioselectivities (up to >99% ee).

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

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A novel chelating chiral bis(formamidine-urea) ligand was synthesized and used to prepare the corresponding Ni and Cu11 complexes. Spectroscopic and X-ray crystallographic analysis of the former revealed that the urea moiety of the acyclic tetradentate ligand is deprotonated and binds to the square-planar Ni2+ ion through amide nitrogen atoms. This complex showed quasi-reversible redox behavior in cyclic voltammetry, with E1/2 = 640 mV vs. Cp2Fe+/Cp2Fe corresponding to the NiIII/NiII couple. The Cu complex was shown by EPR spectroscopy to also adopt a square-planar geometry [g? = 2.25 (A? = 184 G), g? = 2.06 at 6 K], and reduction was found to be irreversible, perhaps due to the rigid nature of the tetradentate ligand. The nickel complex was found to be a modestly active catalyst for epoxidation of electron-rich alkenes under Mukaiyama’s conditions, likely involving a radical mechanism. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.

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

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 20439-47-8, name is (1R,2R)-Cyclohexane-1,2-diamine, introducing its new discovery. SDS of cas: 20439-47-8

Thioureas and isothiocyanates, compounds of high importance in organic synthesis, have not been considered so far as chiroptical probes that can provide structural information from the analysis of circular dichroism spectra. CD spectra of a set of molecules containing the thiourea, isothiocyanate and phthalimide chromophores were obtained and analyzed on the grounds of the calculated populations of conformers and their individual contributions to the CD spectra. It is shown that the thiourea and isothiocyanate chromophores can provide useful structural information from the analysis of their exciton-coupled CD spectra. Exciton-coupled CD spectra of thioureas were found to be sensitive to the Z/E conformation of the chromophore. DFT calculations based on the B2LYP functional were shown to provide a better match with the experimental spectra collected in the short wavelength region, compared to the traditionally used B3LYP functional.

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