Tag: M.W:200-300

Reference of 1271-19-8, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 1271-19-8, Name is Titanocenedichloride,introducing its new discovery.

REACTIONS OF SEMICARBAZONES WITH BIS(CYCLOPENTADIENYL)-TITANIUM(IV)CHLORIDE

The reactions of bis(cyclopentadienyl)titanium(IV)chloride (Cp2TiCl2) with mono- and dibasic semicarbazones in tetrahydrofuran (molar ratio 1:1) in the presence of triethylamine at room temperature, have been described.With monobasic semicarbazones (derived from condensation of semicarbazide with aldehydes/ketones) such as of acetone (AcScH), acetophenone (AcPhScH), benzophenone (BzPhScH), ethylmethylketone (EMScH), iso-butylmethylketone (i-BuMeScH), cyclopentanone (CyPScH), cyclohexanone (CyHxScH), furfuraldehyde (FScH), benzaldehyde (BAScH) and cinnamaldehyde (CinAScH), Cp2TiCl2 reacts with the formation of derivatives of the type where – is the anion of the corresponding monobasic semicarbazone.The reactions of Cp2TiCl2 with dibasic semicarbazones (derived from hydroxy aryl aldehydes) such as of salicylaldehyde (SASc’H2) and vanillin (VanSc’H2) yield the product of the type , where 2- is the anion of the corresponding dibasic semicarbazone.These complexes have been cheracterized on the basis of elemental analyses, electrical conductance measurements and spectral (infrared, NMR and electronic) data.

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

Related Products of 10495-73-5, 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. 10495-73-5, Name is 6-Bromo-2,2′-bipyridine, molecular formula is C10H7BrN2. In a Article£¬once mentioned of 10495-73-5

Hydrogenation of esters catalyzed by ruthenium PN3-Pincer complexes containing an aminophosphine arm

Hydrogenation of esters under mild conditions was achieved using air-stable ruthenium PN3-pincer complexes containing an aminophosphine arm. High efficiency was achieved even in the presence of water. DFT studies suggest a bimolecular proton shuttle mechanism which allows H2 to be activated by the relatively stable catalyst with a reasonably low transition state barrier.

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

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 18531-99-2, molcular formula is C20H14O2, introducing its new discovery. Formula: C20H14O2

Synthesis of l-rhamnose derived chiral bicyclic triazoles as novel sodium-glucose transporter (SGLT) inhibitors

Herein we describe the synthesis of a series of novel fused bicyclic 1,2,3-triazoles from commercially available, natural deoxy sugar, l-rhamnose. The key reactions involved are (i) Zn(OTf)2 catalyzed enantioselective alkynylation of l-rhamnose derived azidoaldehyde and (ii) deprotection of the acid sensitive 1,2-isopropylidene group followed by in situ intramolecular click-cycloaddition of azidoalkynols. Some compounds exhibit excellent sodium-glucose transporter (SGLT1 and SGLT2) inhibition activity. This journal is

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

Synthetic Route of 18531-99-2, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18531-99-2, Name is (S)-[1,1′-Binaphthalene]-2,2′-diol, molecular formula is C20H14O2. In a Article£¬once mentioned of 18531-99-2

Asymmetric Synthesis of Axially Chiral 1,1′-Biphenyl-2-carboxylates via Nucleophilic Aromatic Substitution on 2-Menthoxybenzoates by Aryl Grignard Reagents

A practical method is presented for an asymmetric synthesis of axially chiral 1,1′-biphenyl-2-carboxylates via the ester-assisted nucleophilic aromatic substitution reaction.Thus, upon treatment of 2-tert-butylphenyl 2-<(-)-menthoxy>benzoates with an aryl Grignard reagent, chirality of the leaving (-)-menthoxy group is transferred to the newly formed biphenyl linkage with up to 94percent optical yield.

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

Synthetic Route of 1671-87-0, 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. 1671-87-0, name is 3,6-Di(pyridin-2-yl)-1,2,4,5-tetrazine. In an article£¬Which mentioned a new discovery about 1671-87-0

Preparation of pyrrolizinone derivatives via sequential transformations of cyclic allyl imides: Synthesis of quinolactacide and marinamide

A facile synthetic route has been developed for the preparation of pyrrolizinone derivatives employing N-allyl imides as starting materials. The nucleophilic addition of a vinyl Grignard reagent/RCM/elimination sequence afforded pyrrolizinones in good yields and has been applied for the preparation of naturally occurring quinolactacide and marinamide.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Product Details of 1941-30-6. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1941-30-6

In-situ observation of crystal growth of silicalite under hydrothermal synthesis condition

Crystal growth process of silicalite from a clear aqueous solution of the synthesis mixture with a composition of 0.1 TPABr-0.05Na2O-SiO2-300H2O was studied by an optical microscope. The growth rates of specific crystals were measured at temperatures of 135, 150, 165 and 180C. During the initial stage of crystallization, a linear growth rate was observed. Apparent activation energies for crystal length(El) and crystal width(Ew) were 61 kJ/mol and 36 kJ/mol, respectively.

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

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Configurational assignment of vic-amino alcohols from their circular dichroism spectra with dirhodium tetracetate as an auxiliary chromophore

The circular dichroism spectra of a variety of vic-amino alcohols in the presence of dirhodium tetraacetate as an auxiliary chromophore were measured in ethanol as the solvent. The method was tested with several model compounds, representing both acyclic and cyclic amino alcohols, including biologically important adrenergic drugs as well as amino sugars. The study demonstrated that the sign of the Cotton effects is determined by the preferred helicity of the O-C-C-N unit in the chiral complex formed in situ. The combined analysis of the CD, UV-vis, 1H and 13C NMR indicated predisposition to form chiral complexes by initial coordination of the amino alcohol at the axial coordination site followed by migration to the equatorial position. Finally, after migration of the ligand to an equatorial position(s) a bridging or a chelating complex is formed. Hence, vic-amino alcohols in ethanol act as bidentate ligands in the end.

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

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 16858-01-8, molcular formula is C18H18N4, introducing its new discovery. HPLC of Formula: C18H18N4

Reductive Activation of O2 by Non-Heme Iron(II) Benzilate Complexes of N4 Ligands: Effect of Ligand Topology on the Reactivity of O2-Derived Oxidant

A series of iron(II) benzilate complexes (1-7) with general formula [(L)FeII(benzilate)]+ have been isolated and characterized to study the effect of supporting ligand (L) on the reactivity of metal-based oxidant generated in the reaction with dioxygen. Five tripodal N4 ligands (tris(2-pyridylmethyl)amine (TPA in 1), tris(6-methyl-2-pyridylmethyl)amine (6-Me3-TPA in 2), N1,N1-dimethyl-N2,N2-bis(2-pyridylmethyl)ethane-1,2-diamine (iso-BPMEN in 3), N1,N1-dimethyl-N2,N2-bis(6-methyl-2-pyridylmethyl)ethane-1,2-diamine (6-Me2-iso-BPMEN in 4), and tris(2-benzimidazolylmethyl)amine (TBimA in 7)) along with two linear tetradentate amine ligands (N1,N2-dimethyl-N1,N2-bis(2-pyridylmethyl)ethane-1,2-diamine (BPMEN in 5) and N1,N2-dimethyl-N1,N2-bis(6-methyl-2-pyridylmethyl)ethane-1,2-diamine (6-Me2-BPMEN in 6)) were employed in the study. Single-crystal X-ray structural studies reveal that each of the complex cations of 1-3 and 5 contains a mononuclear six-coordinate iron(II) center coordinated by a monoanionic benzilate, whereas complex 7 contains a mononuclear five-coordinate iron(II) center. Benzilate binds to the iron center in a monodentate fashion via one of the carboxylate oxygens in 1 and 7, but it coordinates in a bidentate chelating mode through carboxylate oxygen and neutral hydroxy oxygen in 2, 3, and 5. All of the iron(II) complexes react with dioxygen to exhibit quantitative decarboxylation of benzilic acid to benzophenone. In the decarboxylation pathway, dioxygen becomes reduced on the iron center and the resulting iron-oxygen oxidant shows versatile reactivity. The oxidants are nucleophilic in nature and oxidize sulfide to sulfoxide and sulfone. Furthermore, complexes 2 and 4-6 react with alkenes to produce cis-diols in moderate yields with the incorporation of both the oxygen atoms of dioxygen. The oxygen atoms of the nucleophilic oxidants do not exchange with water. On the basis of interception studies, nucleophilic iron(II) hydroperoxides are proposed to generate in situ in the reaction pathways. The difference in reactivity of the complexes toward external substrates could be attributed to the geometry of the O2-derived iron-oxygen oxidant. DFT calculations suggest that, among all possible geometries and spin states, high-spin side-on iron(II) hydroperoxides are energetically favorable for the complexes of 6-Me3-TPA, 6-Me2-iso-BPMEN, BPMEN, and 6-Me2-BPMEN ligands, while high spin end-on iron(II) hydroperoxides are favorable for the complexes of TPA, iso-BPMEN, and TBimA ligands.

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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£¬ HPLC of Formula: C11H12N2O2, Which mentioned a new discovery about 153-94-6

Amide Bond Replacements Incorporated into CCK-B Selective “Dipeptoids”

This paper describes the chemical synthesis and CCK-B and CCK-A receptor binding affinities of a series of compounds in which the central amide bond of the CCK-B “dipeptoid” ligand tricyclo<3.3.1.13,7>dec-2-yl–<2<<1-(hydroxymethyl)-2-phenylethyl>amino>-1-(1H-indol-3-ylmethyl)-2-oxoethyl>carbamate (4) (CCK-B IC50 = 852 nM), and tricyclo<3.3.1.13,7>dec-2-yl(R)-<1-(1H-indol-3-ylmethyl)-1-methyl-2-oxo-2-<(2-phenylethyl)amino>ethyl>carbamate (23) (CCK-B IC50 = 32 nM) is replaced by 11 different amide replacements.These replacements are the methyleneamino (CH2NH ), the reverse amide (NHCO), the ester (COO), the N-methylamide (CONMe), the thioamide (CSNH), the N-acetylmethyleneamino (CH2NAc), the cis double bond (CHCH), the ethylene (CH2CH2), the thiolester (COS), the hydroxyethylene (CHOHCH2), and a 4,5-dihydro-1,3-thiazole.Most of the replacements have weaker affinity and reduced selectivity for the CCK-B receptor than the parent amide.However, this affinity can be improved by appending a fumarate side chain to the phenethyl group e.g. tricyclo<3.3.1.13,7>dec-2-yl-3-(1H-indol-3-yl-methyl)-3-methyl-4,9-dioxo-7-phenyl-5,13-dioxa-2,8-diazatetradec-10-enoate (36) (CCK-B IC50 = 38.8 nM).Replacement of the amide of compound 4 with a 4,5-dihydro-1,3-thiazole gives tricyclo<3.3.1.13,7>dec-2-yl-<1-<4,5-dihydro-4-(phenylmethyl)-2-thiazolyl>-2-(1H-indol-3-yl)ethyl>carbamate (5), which is selective for the CCK-A receptor (CCK-A IC50 = 125 nM, CCK-B IC50 = 2580 nM, ratio = 21).The methyleneamino and hydroxyetylene replacements, which have been used elsewhere as transition-state inhibitors of enzymes, are poor mimics of the amide in these CCK-B receptor ligands.Some of the steric, lipophilic, and and hydrogen bonding properties of amide replacements incorporated into the simple amide, N-methylacetamide, have been quantified with the aid of molecular modeling.These data will contribute to the rational selection of amide bond replacements in other substrates.

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

Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of: Tetrapropylammonium bromide. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1941-30-6

Synthesis of nd-doped ZSM-5 and its application to treating slightly polluted water

In this study, ZSM-5 zeolite was synthesized using diatomaceous mud as the raw material, and then doped with different amounts of Nd2 O3. The orthogonal experiments were performed to investigate the influence of Nd:Si molar ratio, zeolite dosage, contact time, solution pH and temperature on the removal of humic acid (HA). The removal of HA was comprehensively evaluated by chemical oxygen demand (COD), UV254 and UV410 of the solution. The results demonstrate that solution pH and zeolite dosage are the two most important factors influencing HA adsorption. The optimum experimental conditions were determined to be: 35W C, Nd:Si molar ratio of 1:100, 2.0 g/L zeolite, pH 4 and 50 min contact time. Under these conditions, the removal efficiencies of UV254, UV410 and COD are 82.70%, 76.00% and 82.10%, respectively, corresponding to a comprehensive removal of 81.02%.

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