Day: February 19, 2021

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. 114615-82-6, Name is Tetrapropylammonium perruthenate, molecular formula is C12H28NO4Ru. In a Article£¬once mentioned of 114615-82-6, name: Tetrapropylammonium perruthenate

Compound-specific D/H ratios of lipid biomarkers from sediments as a proxy for environmental and climatic conditions

Hydrogen isotope ratios (D/H) of lipid biomarkers extracted from aquatic sediments were measured to determine wether they can be used as a proxy for D/H of environmental water. Values of deltaD were determined by using a recently developed isotope-ratio-monitoring gas chromatograph-mass spectrometer system (irmGCMS) and were confirmed by conventional hydrogen isotopic measurements (i.e., combustion followed by reduction) on individual compounds isolated by preparative capillary gas chromatography. Diverse lipids (alkanes, n-alkanols, sterols, and pentacyclic triterpenols) were analyzed to examine hydrogen-isotopic controls on lipids of varying origin and biosynthetic pathway. For algal sterols (24-methylcholest-3beta, 24-ethylcholest-5,22-dien-3beta-ol, and 4,23,24-trimethylcholesterol, or dinosterol), the fractionation between sedimentary lipids and environmental water was -201 ¡À 10? and was similar in both marine and freshwater sites. In a sediment from a small lake in a forested catchment, triterpenols from terrestrial sources were enriched in D by 30? relative to algal sterols. Apparent fractionation factors for n-alkyl lipids were smaller than those of triterpenols and were more variable, probably reflecting multiple sources for these compounds. We conclude that hydrogen-isotopic analyses of algal sterols provide a viable means of reconstructing D/H of environmental waters. Results are less ambiguous than reconstructions based on analyses of kerogen or other operationally defined organic matter fractions. Copyright

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.114615-82-6, Name is Tetrapropylammonium perruthenate, molecular formula is C12H28NO4Ru. In a Patent£¬once mentioned of 114615-82-6, HPLC of Formula: C12H28NO4Ru

THERAPEUTIC COMPOUNDS FOR TREATING DYSLIPIDEMIC CONDITIONS

Compounds of Formula I and the pharmaceutically acceptable salts and esters thereof, wherein Z is selected from the group consisting of: (a) Formula Ia and (b) Formula Ib are novel LXR agonists and are useful in the treatment of dyslipidemic conditions particularly depressed levels of HDL cholesterol.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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Synthesis and redox properties of [{CpRu(L2)}2-(mu-fumaronitrile)] [OTf]2 and [CpRu(L2) (sigmaN-fumaronitrile)] [OTf] with L2 = N,N?-diisopropyl-1,4-diaza-1,3-butadiene (iPr-DAB) or L = PPh3

The reaction of [CpRu(iPr-DAB) (OTf)] (iPr-DAB = N,N?-diisopropyl-1,4-diaza-1,3-butadiene) with excess fumaronitrile yields [CpRu(iPr-DAB) (sigmaN-fumaronitrile)] [OTf] (1), which is in equilibrium with the binuclear complex [{CpRu(iPr-DAB)}2(mu-fumaronitrile)] [OTf]2 (2) and free fumaronitrile. Complex 2 could be prepared quantitatively by the reaction of [CpRu(iPr-DAB)] [OTf] with 0.5 equiv. of fumaronitrile. The reaction of [CpRu(PPh3)2] [OTf] with excess fumaronitrile led to the monomeric complex [CpRu(PPh3)2(sigmaN-fumaronitrile)] [OTf] (3), while reaction with 0.5 equiv. of fumaronitrile gave [{CpRu(PPh3)2}2(mu-fumaronitrile)] [OTf]2 (4) in 100% yield. Attempts to isolate the asymmetric compound [CpRu(iPr-DAB) (mu-fumaronitrile)CpRu(PPh3)2] [OTf]2 (5) failed since in all cases a mixture of 2,4 and the desired complex 5 was formed. The redox behavior of complexes 1 and 2 was investigated by cyclic voltammetry and UV-Vis/IR spectroelectrochemistry. The chemically irreversible one-electron reduction of both complexes is localized on the fumaronitrile ligand, as was also found for the PPh3-substituted complexes 3 and 4. These results are in sharp contrast with the chemically reversible, iPr-DAB-localized one-electron reduction of the mononuclear derivatives [CpRu(iPr-DAB)(X)]+ (X = CO, PPh3), Oxidation of the RuII centers in 1 and 2 resulted in secondary chemical reactions. The final oxidation product in the case of the binuclear complex 2 has been unambiguously identified as the cation [CpRu(iPr-DAB) (OTf)]+. This result demonstrates that the RuIII-(sigmaN-fumaronitrile) bond in the studied complexes is rather weak and easily dissociates. The oxidation-induced reactivity of 2 hence rules out the spectroscopic characterization of the mixed-valence RuIIRuIII intermediate 2+.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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. 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), molecular formula is C20H16Cl2N4Ru. In a Article£¬once mentioned of 15746-57-3, Recommanded Product: 15746-57-3

Off-on-off fluorescence pH switch of three trinuclear RuII complexes containing imidazole rings

Three tripodal ligands H3L1-3 containing imidazole rings were synthesized by the reaction of 1,10-phenanthroline-5,6-dione with 1,3,5-tris[(3-formylphenoxy)methyl]benzene, 1,3,5-tris[(3-formylphenoxy)methyl]- 2,4,6-trimethylbenzene, and 2,2?,2?-tris[(3-formylphenoxy)ethyl] amine, respectively. Trinuclear RuII polypyridyl complexes [(bpy)6Ru3H3L1-3](PF 6)6 were prepared by the condensation of Ru(bpy) 2Cl2¡¤2H2O with ligands H 3L1-3. The pH effects on the UV/Vis absorption and fluorescence spectra of the three complexes were studied, and ground- and excited-state ionization constants of the three complexes were derived. The three complexes act as “off-on-off” fluorescence pH switch through protonation and deprotonation of imidazole ring with a maximum on-off ratio of 5 in buffer solution at room temperature.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Reference of 246047-72-3, 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. 246047-72-3, C46H65Cl2N2PRu. A document type is Article, introducing its new discovery.

Facile synthesis of fluorovinyl-containing lactams via ring-closing metathesis of N-substituted 2-fluoroallylamides

A cost-efficient method for the preparation of a series of N-substituted 2-fluoroallylamines and their application in the synthesis of fluoroalkene-containing lactams are described. N-substituted 2-fluoroallylamine could be readily synthesized from methyl 2-fluoroacrylate via aminolysis and subsequently selective reduction of the amide group. These amines were further converted into the corresponding amides with diverse acids bearing a terminal double bond. The Ring-Closing Metathesis (RCM) of the resulting amides led to the formation fluorovinyl-containing lactams in good yields.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.32993-05-8, Name is Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II), molecular formula is C41H35ClP2Ru. In a Article£¬once mentioned of 32993-05-8, Recommanded Product: 32993-05-8

Enaminones via ruthenium-catalyzed coupling of thioamides and alpha-diazocarbonyl compounds

Enaminones can be prepared via the Rh2(OAc)4- catalyzed coupling of alpha-diazocarbonyl compounds with thioamides. However, rhodium is the most expensive and least abundant among the dominant precious metals used for catalysis. Furthermore, a very limited substrate scope is known for the intermolecular rhodium catalyzed coupling reaction. Therefore, there is a need to find a more economical catalyst substitute with a broad substrate scope. In this paper, we describe the use of Ru(II) catalysts for the synthesis of enaminones. The reaction can be performed efficiently with the Grubbs first-generation catalyst or [(Ph)3P]3RuCl2 in a sealed tube. Both catalysts are much less expensive than Rh 2(OAc)4. Secondary and tertiary thioamides, when reacted with alpha-diazodiesters, alpha-diazoketoesters, alpha-diazodiketones, and alpha-diazomonoketones give enaminones. Primary thioamides give thiazole derivatives when reacted with alpha-diazomonoketones. However, with other diazo compounds, primary thioamides also give enaminones. All enaminones are obtained in good yields and with good diastereoselectivity. Accordingly, the method described in this paper is an efficient and economical alternative to the Rh2(OAc)4-catalyzed coupling process.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

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. 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a Article£¬once mentioned of 37366-09-9, category: ruthenium-catalysts

Locked and Loaded: Ruthenium(II)-Capped Cucurbit[ n]uril-Based Rotaxanes with Antimetastatic Properties

We report here the first coupling of Ru(II) units with cucurbit[6/7]uril-based pseudorotaxane ligands meant for biological application. The resulting ruthenium-capped rotaxanes were fully characterized, and a structure of one supramolecular system was determined by X-ray diffraction. Because the biological properties of Ru-based metallodrugs are tightly linked to the ligand-exchange processes, the effect of salt concentration on the hydrolysis of chlorides from the Ru(II) center was monitored by using 1H NMR spectroscopy. The biological activity of Ru(II)-based rotaxanes was evaluated for three selected mammalian breast cell lines, HBL-100, MCF-7, and MDA-MB-231. The antimetastatic activity of the assembled cationic Ru(II)-rotaxane systems, evaluated in migration assays against MCF-7 and MDA-MB-231 cell lines, is notably enhanced compared to that of RAPTA-C, a reference that was used. The indicated synergistic effect of combining Ru(II) with a pseudorotaxane unit opens a new direction in searching for anticancer supramolecular metallodrugs.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Synthetic Route of 114615-82-6. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 114615-82-6, Name is Tetrapropylammonium perruthenate. In a document type is Patent, introducing its new discovery.

Substituted Imidazopyridines as HDM2 Inhibitors

The present invention provides substituted imidazopyridines as described herein or a pharmaceutically acceptable salt or solvate thereof. The representative compounds are useful as inhibitors of the HDM2 protein. Also disclosed are pharmaceutical compositions comprising the above compounds and potential methods of treating cancer using the same.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 114615-82-6, Name is Tetrapropylammonium perruthenate, SDS of cas: 114615-82-6.

17-heterocyclyl-14beta-5alpha-androstane, androstene and androstadiene derivatives active on the cardiovascular system, and pharmaceutical compositions containing same

17-Heterocyclyl-5alpha-14beta-androstane, androstene and androstadiene of formula (I): STR1 wherein: Y is oxygen or guanidinoimino, when a double bond exists at position 3; Y is hydroxy, OR2 or SR2, when a single bond exists at position 3; R is a saturated or unsaturated mono- or biheterocyclic ring, containing one or more heteroatoms selected from the group consisting of oxygen, sulfur, and nitrogen, unsubstituted or substituted by one or more of halogen, hydroxymethyl, alkoxy, amino, alkylamino, dialkylamino, cyano, nitro, sulfonamido, C1 -C6 lower alkyl or COR3 ; and R1 is hydrogen, methyl, ethyl or n-propyl substituted by OH or NR4 R5.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI

Synthetic Route of 301224-40-8. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 301224-40-8, Name is (1,3-Dimesitylimidazolidin-2-ylidene)(2-isopropoxybenzylidene)ruthenium(VI) chloride

Total synthesis of viridiofungin A

Viridiofungin A, a member of amino alkyl citrate antibiotics from Trichoderma viride, was enantioselectively synthesized in naturally occurring form for the first time, employing regio- and stereoselective opening of the chiral glycidate with vinylmagnesium bromide and alkene cross metathesis of the citric acid core and hexadec-15-en-8-one as key steps. The Royal Society of Chemistry 2005.

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Reference£º
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI