Tag: M.W:200-300

Electric Literature of 29841-69-8, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.29841-69-8, Name is (1S,2S)-(-)-1,2-Diphenylethylenediamine, molecular formula is C14H16N2. In a article£¬once mentioned of 29841-69-8

Synthesis and characterization of chiral nickel(II) Schiff base complexes and their CD spectra-absolute configuration correlations

Some nickel(II) complexes of quadridentate Schiff bases prepared from the condensation of 2 mol of 2-hydroxyacetophenone (HACP) or dehydroacetic acid (DHA) with 1 mol of optically active propylene-1,2-diamine (pn), trans-cyclohexane-1,2-diamine (chxn) or 1,2-diphenylethylenediamine (dpen) were synthesized and characterized by EA, IR, UV-vis, and CD spectra. The absolute configurations of the three complexes were determined by X-ray single crystal structure measurement and correlated with CD spectroscopy. In this study, special attention is focussed on the CD signals of the related complexes in the d-d transition region, in the hope of obtaining a tentative correlation between the CD pattern and the absolute configuration about the central metal. A new empirical rule for the assignment of the absolute configuration around the nickel ion in each complex and the handedness of the chiral diamine contained in the Schiff base ligand is put forward. In the case of tetra-coordinated pseudo-planar Ni(II) complexes, the rule can be stated as follows: (i) a positive Cotton effect in the d-d region around 550 nm is assigned to the (S)Deltalambda-configuration for the HACP-(S)-pn-Ni, HACP-(SS)-dpen-Ni, DHA-S-pn-Ni, and DHA-(SS)-dpen-Ni derivatives; and (ii) a concomitant inversion of the Cotton effect in the same range is assigned to the (S)Lambdadelta-configuration for the HACP-(SS)-chxn-Ni and DHA-(SS)-chxn-Ni derivatives.

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

Electric Literature of 18531-94-7, 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. 18531-94-7, Name is (R)-[1,1′-Binaphthalene]-2,2′-diol, molecular formula is C20H14O2. In a Article£¬once mentioned of 18531-94-7

Synthesis of chiral 3,3?-disubstituted 1,1?-binaphthyl-2, 2?-disulfonic acids

A convenient synthesis of chiral 3,3?-disubstituted 1,1?-binaphthyl-2,2?-disulfonic acids (BINSA, 1) was developed. The key was directed ortho-lithiation of BINSA methyl ester 2 with n-BuLi and subsequent reaction with an electrophile. Electrophiles such as Br2, I2, Me3SiOTf, and i-PrOB(Pin) reacted smoothly with 3,3?-dilithiated BINSA methyl ester, and the corresponding 3,3?-dihalo-, 3,3?-bis(trimethylsilyl)-, and 3,3?-diboryl- BINSA derivatives were obtained in yields of 21-78%. This simple synthetic method is highly attractive since the ability to prepare 3,3?- disubstituted BINOLs in advance can be useful.

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Metal catalyst and ligand design,
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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, 16858-01-8, name is Tris(2-pyridylmethyl)amine, introducing its new discovery. Computed Properties of C18H18N4

Rhodium, palladium and platinum complexes of tris(pyridylalkyl)amine and tris(benzimidazolylmethyl) amine N4-tripodal ligandst

To investigate the influence of a potentially N4-tripodal amine ligand on the structure and internal exchange processes of its complexes with late transition metals, five rhodium, six palladium and two platinum complexes have been prepared from seven alkyl-bridged N-heterocyclic amine tripodal ligands: tris(2-pyridylmethyl)amine, (2-(2-pyridylethyl))bis(2-pyridylmethyl)amine, bis(2-(2-pyridylethyl))-2-pyridylmethylamine, bis(2-(2-pyridylethyl))amine, ((6-(hydroxymethyl)-2-pyridyl)methyl)bis(2-pyridylmethyl)amine, tris(2-benzimidazolylmethyl)amine (tbima) and tris(3-ethyl-2-benzimidazolylmethyl)amine. Single-crystal X-ray diffraction studies were completed for ten complexes: the d6-rhodium(in) complexes are octahedral with kappa4W-bound ligands, whereas the d8-palladium(II) and d8-platinum(II) complexes are square planar, kappa3N-bound by the tripodal ligand with a dangling N-donor leg, except for the unusual [Pd2(tbima)2Cl 2]Cl2 dimer in which each palladium(II) ion is square planar and bound by two benzimidazole legs from one tbima ligand, one leg from the other tbima ligand and a chloride ancillary ligand. Cation bilayers are a common structural motif in the crystal structures. Variable-temperature 1H NMR studies reveal exchange occurs between the coordinated and dangling N-donor legs in the palladium and platinum complexes. Exchange free energy (DeltaG?C) values have been calculated and some general rules governing the favoured complex structures and exchange pathways elucidated. The palladium(II) and platinum(II) complexes of a ligand with an pyridylethyl leg are unstable with respect to elimination of vinylpyridine. The Royal Society of Chemistry 2006.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 16858-01-8 is helpful to your research. Computed Properties of C18H18N4

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Metal catalyst and ligand design,
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Reference of 18531-99-2, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 18531-99-2, Name is (S)-[1,1′-Binaphthalene]-2,2′-diol,introducing its new discovery.

Effects of solvent on inclusion complexation of a chiral dipeptide toward racemic BINOL

The effects of reaction solvent on inclusion complexation of a chiral dipeptide (3S,6S)-1 derived from (S)-proline toward racemic BINOL was investigated, discovering that the reaction solvent played a crucial role in determining the inclusion complexation behavior of dipeptide (3S,6S)-1 toward rac-BINOL. (3S,6S)-1 did not show any chiroselective or achiroselective complexation toward rac-BINOL in polar protic solvents such as methanol and ethanol, polar aprotic solvents including trichloromethane and THF, while in polar aprotic solvent ethyl acetate and apolar aprotic solvents benzene, (3S,6S)-1 displayed achiroselective complexation toward rac-BINOL. However, the resulting heterocomplex HC-2 from benzene and HC-3 from ethyl acetate have a different composition. Single crystal X-ray diffraction analysis demonstrates that the two heterocomplexes are formed via different H-bond interaction patterns, in which the reaction solvent has a dramatic effect. Furthermore, this work provides a relatively green method for quantitative enantiomeric enrichment of nonracemic BINOL, in which unacceptable and toxic benzene was replaced by ethyl acetate.

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Reactivity control in the addition of N,N?-dialkylated 1,n-diamines to activated skipped diynes: Synthesis of fused bicyclic 1,4-diazepanes and 1,5-diazocanes

A metal-free domino reaction for the synthesis of a new family of fused bicyclic 1,4-diazepanes and 1,5-diazocanes has been developed. The reaction involves the use of N,N?-dialkylated 1,n-diamines as the nitrogen source, through-space orbital interactions between the two nitrogen atoms as the reactivity director element, and an activated skipped diyne as the reactive platform. A key Morita-Baylis-Hillman-like reaction allows the formation of 1,4-diazepanes and 1,5-diazocanes (medium-sized diazoheterocycles). These structures incorporate a 1,n-diazocycle fused to a I3-butenolide ring and different functionalities to be used as convenient handles for further complexity generation. The good efficiency of this reaction and its simple experimental protocol make this process an excellent candidate for the fast construction of structure-focused libraries based on this fused bicyclic motif.

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Metal catalyst and ligand design,
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Synthesis and characterization of (cyclopentadienyl)titanium(IV) complexes of 1,3-dihydro-1,3-dioxo-alpha-(substituted)-2H-isoindole 2-acetates

Complexes having the general formulae (C5H5)2TiCl(L), C5H5)TiCl(L)2 and (C5H5)2Ti(L)2, have been synthesized by the reactions of N-protected amino acids (LH), (where R = -H, -CH(CH3)2, -CH2C6H5, -CH2CH2SCH3 and -CHR- = -CH2CH2-) with titanocene dichloride in the presence of triethylamine in refluxing tetrahydrofuran.These derivatives have been characterized by elemental analyses, molecular weight measurements, and IR, 1H and 13C NMR spectral studies.

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

Synthetic Route of 16858-01-8, 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. 16858-01-8, Name is Tris(2-pyridylmethyl)amine, molecular formula is C18H18N4. In a Article£¬once mentioned of 16858-01-8

Constructing zwitterionic polymer brush layer to enhance gravity-driven membrane performance by governing biofilm formation

In this study, zwitterionic polymer brushes with controlled architecture were grafted on the surface of gravity-driven membrane (GDM) via surface-initiated reaction to impart antifouling property. A variety of membrane characterization techniques were conducted to demonstrate the successful functionalization of zwitterionic polymers on PVDF hollow fiber membrane. The membrane underwent 90 min of reaction time possessing strong hydrophilicity and high permeability was determined as the optimal modified membrane. Long-term GDM dynamic fouling experiments operated for 30 days using sewage wastewater as feed solution indicated zwitterionic polymer modified membrane exhibit excellent membrane fouling resistance thus enhanced stable flux. Confocal laser scanning microscopy (CLSM) imaging implied that zwitterionic polymer modification significantly inhibit the adsorption of extracellular polymeric substances (EPS) which dominates fouling propensity, resulting in the formation of a thin biofilm with high porosity under synthetic functions of foulants deposition and microbial activities. Interfacial free energy prediction affirmed the presence of zwitterionic functional layer on membrane surface could substantially decrease the interactions (e.g., electrostatic attractions and hydrophobic effects) between membrane and foulants, thereby reduced flux decline and high stable flux. Our study suggests surface hydrophilic functionalization shows promising potential for improving the performance of ultra-low pressure filtration.

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Metal catalyst and ligand design,
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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, 1271-19-8, name is Titanocenedichloride, introducing its new discovery. name: Titanocenedichloride

Reaction of metallocenes with maleic anhydride

Spectral investigation applying UV, IR, and 1H NMR techniques to the reaction of ferrocene, titano- and zirconocene dichlorides with maleic anhydride was carried out. It was found that in all cases charge transfer complexes were formed. It was showed that the structure of the metallocene affected both the process of the formation and structure of the complexes.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1271-19-8 is helpful to your research. name: Titanocenedichloride

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

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Quality Control of: Tetrapropylammonium bromide, Which mentioned a new discovery about 1941-30-6

A Quasithermodynamic Approach to the Viscous Flow of Aqueous Electrolyte Solutions at Moderate and High Concentrations

Recent viscosity data for aqueous electrolyte solutions of varying concentrations and at various temperatures have been analysed using the Eyring rate-process equation to obtain the activation parameters for viscous flow.Some phenomenological correlations observed for the activation parameters have been examined, and solute-solvent interactions are discussed in terms of the concentration dependence of the activation parameters.

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

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Application In Synthesis of 1,10-Phenanthroline-2,9-dicarboxylic acid, Which mentioned a new discovery about 57709-61-2

Solvent-Driven Conformational Exchange for Amide-Linked Bichromophoric BODIPY Derivatives

The fluorescence lifetime and quantum yield are seen to depend in an unexpected manner on the nature of the solvent for a pair of tripartite molecules composed of two identical boron dipyrromethene (BODIPY) residues attached to a 1,10-phenanthroline core. A key feature of these molecular architectures concerns the presence of an amide linkage that connects the BODIPY dye to the heterocyclic platform. The secondary amide derivative is more sensitive to environmental change than is the corresponding tertiary amide. In general, increasing solvent polarity, as measured by the static dielectric constant, above a critical threshold tends to reduce fluorescence but certain hydrogen bond accepting solvents exhibit anomolous behaviour. Fluorescence quenching is believed to arise from light-induced charge transfer between the two BODIPY dyes, but thermodynamic arguments alone do not explain the experimental findings. Molecular modelling is used to argue that the conformation changes in strongly polar media in such a way as to facilitate improved rates of light-induced charge transfer. These solvent-induced changes, however, differ remarkably for the two types of amide.

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