Some scientific research about 153-94-6

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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, 153-94-6, molcular formula is C11H12N2O2, introducing its new discovery. Recommanded Product: 153-94-6

Biochemical investigations of two 6-DMATS enzymes from streptomyces reveal new features of l -tryptophan prenyltransferases

Two putative prenyltransferase genes, SAML0654 and Strvi8510, were identified in Streptomyces ambofaciens and Streptomyces violaceusniger, respectively. Their deduced products share 63-?% sequence identity. Biochemical investigations with recombinant proteins demonstrated that L-tryptophan and derivatives, including D-tryptophan, 4-, 5-, 6- and 7-methyl-dl-tryptophan, were well accepted by both enzymes in the presence of DMAPP. Structural elucidation of the isolated products revealed regiospecific prenylation at C-6 of the indole ring and proved unequivocally the identification of two very similar 6-dimethylallyltryptophan synthases (6-DMATS). Detailed biochemical investigations with SAML0654 proved L-tryptophan to be the best substrate (Km 18 mum, turnover 0.3 s-1). Incubation with different prenyl donors showed that they also accepted GPP and catalyzed the same specific prenylation. Utilizing GPP as a prenyl donor has not been reported for tryptophan prenyltransferases previously. Both enzymes also catalyzed prenylation of some hydroxynaphthalenes; this has not previously been described for bacterial indole prenyltransferases. Interestingly, SAML0654 transferred prenyl moieties onto the unsubstituted ring of hydroxynaphthalenes. They can do more: L-Tryptophan (1-?a) and derivatives as well as hydroxynaphthalenes like 2,3-dihydroxynaphthalene (10-?a) were accepted by 6-DMATSSa and 6-DMATSSv from Streptomyces strains, in the presence of DMAPP and GPP. C6-prenylated indole derivatives and dihydroxynaphthalenes with prenylation at the unsubstituted ring were identified as enzyme products of 6-DMATSSa.

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

Archives for Chemistry Experiments of 68737-65-5

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Reference of 68737-65-5, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.68737-65-5, Name is (1R,2R)-N,N’-Dimethyl-1,2-cyclohexanediamine, molecular formula is C8H18N2. In a Article,once mentioned of 68737-65-5

Polystyrenes with chiral phosphoramide substituents as Lewis base catalysts for asymmetric addition of allyltrichlorosilane: Enhancement of catalytic performance by polymer effect

In the asymmetric addition of allyltrichlorosilane to benzaldehyde, polystyrenes with chiral phosphoramide substituents as Lewis base catalysts showed up to 2.4 times better catalytic activity and 1.4 times higher enantioselectivity than the corresponding low-molecular-weight analogues. The Royal Society of Chemistry 2005.

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

Can You Really Do Chemisty Experiments About 29841-69-8

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Chemistry is an experimental science, Recommanded Product: 29841-69-8, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 29841-69-8, Name is (1S,2S)-(-)-1,2-Diphenylethylenediamine

Chemistry of opium alkaloids, 45. Improvements in the total synthesis of morphine

The chiral 1,2,3,4-tetrahydroisoquinoline intermediates in the Price and Beyerman routes to morphine, (+)-(R)-1-(3-hydroxy-4-methoxybenzyl)-6-methoxy- 1,2,3,4-tetrahydroisoquinoline (6) and (+)-(R)-1-(3,5-dibenzyloxy-4- methoxybenzyl)-6-methoxy-1,2,3,4-tetrahydroisoquinoline (5), were prepared in high ee by ruthenium-catalyzed asymmetric transfer hydrogenation of the corresponding imine precursors (Noyori method). The yield of the key raw material in the Beyerman route, 3,5-dibenzyloxy-4-methoxyphenylacetric acid (1), starting from gallic acid methyl ester (7) was improved by a factor of 5 over previously described syntheses. Key steps in the new procedure are the selective formation of methyl 3,5-dihydroxy-4-methoxybenzoate (9) via the 3,5-diacetate and an improved benzylation of the hydroxyl groups in 9.

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

A new application about 1271-19-8

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A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, SDS of cas: 1271-19-8, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article, authors is Lamboy, Jose L.,once mentioned of 1271-19-8

Synthesis, solution and solid state structure of titanium-maltol complex

The reaction of Cp2TiCl2 with two equivalents of maltol (3-hydroxy-2-methyl-4-pyrone) in water, at room temperature and pH of 5.4, leads to a complete replacement of Cp and chloride ligands affording, Ti(maltolato)2(OH)2. The complex has been characterized by IR, NMR and ESI-MS spectroscopic and cyclic voltammetry methods. In DMSO-d6 solution, the complex shows two isomers in a ratio of 4:1, in which one OH signal can be identified per isomer. This suggests that in solution the complex is monomeric, most likely a chiral cis-Ti(maltolato)2(OH)2 and trans-Ti(maltolato)2(OH)2. The monomeric nature of the complex (in water/methanol 1:1) was verified by ESI-MS spectroscopy, showing a parent peak at 329 m/z. Electrochemical behavior of Ti(maltolato)2(OH)2using cyclic voltammetry experiments showed the complex undergoes irreversible reduction in aprotic solvents. In D2O solution, at pH of 8.4, the 1H NMR spectrum of the complex shows a mixture of monomer and tetramer Ti(IV)-maltol complexes in a ratio of 1:1. The crystallization of Ti(maltolato)2(OH)2 at pH of 8.4 leads to the formation of [Ti4(maltolato)8(mu-O4)] · 18H2O. A single crystal of [Ti4(maltolato)8(mu-O4)] · 18H2O was analyzed by X-ray diffraction methods. Solid state structure determination of the Ti-maltol complex showed to be tetrameric, containing two bridging oxides (in cis position) and two bidentate maltol ligands per titanium in a pseudo-octahedral coordination geometry.

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

The important role of N,N,N-Trimethyldecan-1-aminium bromide

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Related Products of 2082-84-0, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.2082-84-0, Name is N,N,N-Trimethyldecan-1-aminium bromide, molecular formula is C13H30BrN. In a Patent,once mentioned of 2082-84-0

Molecules to Enhance Percutaneous Delivery and Methods for Discovery Therefor

An IR spectroscopic technique provides methods for measuring the irritation potential of a formulation and to assess the ability of molecules to enhance the permeability of substances into and through skin using samples comprising stratum corneum. Molecules are screened for their performance as chemical penetration enhancers using a unique in silico procedure that may be applied iteratively in an attempt to generate molecules showing successively higher performance. Both the irritation potential and the ability of the molecule to enhance penetration are considered in the in silico approach. The invention provides specific molecules that may be used in topical or transdermal formulations to improve the delivery of actives. The structures of compounds of the invention include: Formulas (I), (II), (III), (IV), (V), (IV) and analogs thereof.

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

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Ce(OTf)3-catalyzed [3 + 2] cycloaddition of azides with nitroolefins: Regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles

The first example of rare earth metal-catalyzed [3 + 2] cycloaddition of organic azides with nitroolefins and subsequent elimination reaction is described. In the presence of a catalytic amount of Ce(OTf)3, both benzyl and phenyl azides react with a broad range of aryl nitroolefins containing a range of functionalities selectively producing 1,5-disubstituted 1,2,3-triazoles in good to excellent yields.

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

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Application of 112068-01-6, 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. 112068-01-6, name is (S)-Diphenyl(pyrrolidin-2-yl)methanol. In an article,Which mentioned a new discovery about 112068-01-6

Effect of ligand structure on the zinc-catalyzed Henry reaction. Asymmetric syntheses of (-)-denopamine and (-)-arbutamine

(Matrix presented) Syntheses of variously modified ligands for the dinuclear zinc catalysts for the asymmetric aldol and nitroaldol (Henry) reactions are reported. Catalytic enantioselective nitroaldol reactions promoted by these modified ligands led to efficient syntheses of the beta-preceptor agonists (-)-denopamine and (-)-arbutamine.

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

Properties and Exciting Facts About H-Idc-OH

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ANTITHROMOBOTIC AGENTS

This invention relates to L-arginine aldehyde derivatives, having the Formula I STR1 where X and Y have the values defined in the description, as well as pharmaceutical formulations containing those compounds and methods of their use as thrombin inhibitors, coagulation inhibitors, and thromboembolic disorder agents.

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

Can You Really Do Chemisty Experiments About 3030-47-5

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Electric Literature of 3030-47-5, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.3030-47-5, Name is N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine, molecular formula is C9H23N3. In a Conference Paper,once mentioned of 3030-47-5

Fluorine-free and fluorine containing MOCVD precursors for electronic oxides: A comparison

MOCVD processes adopting two different precursors Sr(tmhd) 2pmdeta and Sr(hfac)2tetraglyme have been compared. In situ FT-IR monitoring shows that Sr(hfac)2tetraglyme posses suitable thermal stability upon sublimation and good mass-transport properties. By contrast, Sr(tmhd)2pmdeta posses lower stability which precludes efficient sublimation/evaporation processes, thus requiring reactors equipped with liquid delivery systems for efficient MOCVD processes. Insights on the MOCVD process have been obtained combining in situ FT-IR and ex situ XRD, XPS, SEM and EDX techniques. Homogeneous films have been deposited on Pt/TiN/SiO 2/Si substrates in the 300-500C temperature range. XRD and XPS analyses have shown that fluorine or carbonate containing films are obtained adopting Sr(hfac)2tetraglyme or Sr(dpm)2pmdeta, respectively.

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

Brief introduction of N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine

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Electric Literature of 3030-47-5, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.3030-47-5, Name is N1-(2-(Dimethylamino)ethyl)-N1,N2,N2-trimethylethane-1,2-diamine, molecular formula is C9H23N3. In a Article,once mentioned of 3030-47-5

Photocontrollable release and enhancement of photodynamic therapy based on host-guest supramolecular amphiphiles

A light-controlled porphyrinic photosensitizer release system was developed based on host-guest TPP-Azo/PEG-beta-CD supramolecular amphiphiles, which could significantly enhance the efficiency of photodynamic therapy. TPP-Azo was prepared via esterification between TPP and Azo derivatives, and further used to construct supramolecular amphiphiles with PEG-beta-CD. TEM images showed that TPP-Azo/PEG-beta-CD amphiphiles can self-assemble into spherical micelles, and then disaggregate under irradiation with 365 nm UV light. The phototoxicity and bio-distribution of TPP-Azo/PEG-beta-CD micelles against the MCF-7 cell line were also evaluated by MTT assay, flow cytometry and confocal scanning laser microscopy, respectively. According to MTT assay, the IC50 of the spherical micelle was 31.2 mug mL-1, but it became 20.6 mug mL-1 upon pre-irradiation with 365 nm UV light. This shows for the first time that UV light can well stimulate the release of porphyrin photosensitizers and improve the photodynamic therapy efficiency based on the system of host-guest supramolecular amphiphiles.

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