Ruthenium catalysts

15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II), molecular formula is C20H16Cl2N4Ru, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 15746-57-3, category: ruthenium-catalysts

Effects of excited state – Excited state configurational mixing on emission bandshape variations in ruthenium – Bipyridine complexes

The 77 K emission spectra of 21 [Ru(L)4bpy]m+ complexes for which the Ru/bpy metal-to-ligand-charge-transfer ( 3MLCT) excited-state energies vary from 12 500 to 18 500 cm -1 have vibronic contributions to their bandshapes that implicate excited-state distortions in low frequency (lf, hnulf < 1000 cm-1), largely metal-ligand vibrational modes which most likely result from configurational mixing between the 3MLCT and a higher energy metal centered (3LF) excited state. The amplitudes of the lf vibronic contributions are often comparable to, or sometimes greater than those of medium frequency (mf, hnumf > 1000 cm-1), largely bipyridine (bpy) vibrational modes, and for the [Ru(bpy)3] 2+ and [Ru(NH3)4bpy]2+ complexes they are consistent with previously reported resonance-Raman (rR) parameters. However, far smaller lf vibronic amplitudes in the rR parameters have been reported for [Os(bpy)3]2+, and this leads to a group frequency approach for interpreting the 77 K emission bandshapes of [Ru(L) 4bpy]m+ complexes with the vibronic contributions from mf vibrational modes referenced to the [Os(bpy)3]2+ rR parameters (OB3 model) and the envelope of lf vibronic components represented by a “progression” in an “equivalent” single vibrational mode (lf1 model). The lf1 model is referenced to rR parameters reported for [Ru(NH3)4bpy]2+. The observation of lf vibronic components indicates that the MLCT excited-state potential energy surfaces of Ru-bpy complexes are distorted by LF/MLCT excited-state/excited-state configurational mixing, but the emission spectra only probe the region near the 3MLCT potential energy minimum, and the mixing can lead to larger distortions elsewhere with potential photochemical implications: (a) such distortions may labilize the 3MLCT excited state; and (b) the lf vibrational modes may contribute to a temperature dependent pathway for nonradiative relaxation.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: ruthenium-catalysts. In my other articles, you can also check out more blogs about 15746-57-3

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

Related Products of 301224-40-8, An article , which mentions 301224-40-8, molecular formula is C31H38Cl2N2ORu. The compound – (1,3-Dimesitylimidazolidin-2-ylidene)(2-isopropoxybenzylidene)ruthenium(VI) chloride played an important role in people’s production and life.

A 3,4-dimercapto-3-cyclobutene-1,2-dione-chelated ruthenium carbene catalyst for: Z -stereoretentive/stereoselective olefin metathesis

A ruthenium carbene catalyst chelated with a 3,4-dioxocyclobut-1-ene-1,2-dithiolate ligand was synthesized and its molecular structure was determined by single-crystal X-ray diffraction. The Ru catalyst had excellent catalytic activity with high yields and good Z/E ratios for the ring opening metathesis polymerization (ROMP) of norbornene (yield: 96%/Z/E: 86 : 14) and 1,5-cyclooctadiene (yield: 86%/Z/E: 91 : 9) and for ring opening cross metathesis (ROCM) reactions of norbornene/5-norbornene-2-exo, 3-exo-dimethanol with styrene (yields: 64%-92%/Z/E: 97 : 3-98 : 2) or 4-fluorostyrene (yield: 46%-94%/Z/E: 98 : 2). The catalyst also had high Z-stereoretentivity (91 : 9-98 : 2) for cross-metathesis (CM) reactions of terminal olefins with (Z)-2-butene-1,4-diol. More importantly, the catalyst had moderate Z-stereoselectivity for homometathesis reactions of terminal olefins giving cis-olefins as the major products (Z/E ratios of 70 : 30-77 : 23). Like other Ru carbene complexes, the catalyst tolerates many different functional groups. The presented data, supported by DFT calculations, show that our catalyst, bearing a chelating 3,4-dioxocyclobut-1-ene-1,2-dithiolate ligand, exhibits higher stability towards air than Hoveyda’s stereoretentive complex systems.

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

246047-72-3, Name is (1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium, molecular formula is C46H65Cl2N2PRu, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 246047-72-3, Computed Properties of C46H65Cl2N2PRu

Qualitative FT-Raman investigation of the ring opening metathesis polymerization of dicyclopentadiene

This study describes the qualitative analysis of the polymerization reaction of DCPD (DiCycloPentaDiene) and its reaction products. The polymerization was carried out using WCl6/Si(allyl)4 (1), first generation Grubbs’ (2) and second generation Grubbs’ (3) catalysts. When system 1 was used as a catalyst, solution concentration determined whether soluble or insoluble polymer was obtained. When Grubbs’ catalysts were employed, insoluble polymer was formed in all cases. The ring opening metathesis polymerization (ROMP)-reaction and the resulting polymers were monitored in situ via FT-Raman-spectroscopy. Using FT-Raman-spectroscopy, the stereospecific nature of the forming polymer can be determined during the polymerization reaction. The obtained spectra illustrate that the linear polymer has a prevailing cis double bond configuration, while the polymer formed using the 1e generation Grubbs catalyst has a predominant trans double bond configuration. The second generation Grubbs catalyst exhibits a poor stereoselectivity. These results are in accordance to literature data where the stereospecific nature of these polymers where determined using NMR-spectroscopy.

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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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Catalyst-controlled asymmetric synthesis of fostriecin and 8-epi-fostriecin

Catalytic asymmetric synthesis of the natural antibiotic fostriecin (CI-920) and its analogue 8-epi-fostriecin and evaluation of their biological activity are described. We used four catalytic asymmetric reactions to construct all of the chiral centers of fostriecin and 8-epi-fostriecin; cyanosilylation of a ketone, Yamamoto allylation, direct aldol reaction, and Noyori reduction, two of which were developed by our group. Catalytic enantioselective cyanosilylation of ketone 13 produced the chiral tetrasubstituted carbon at C-8. Both enantiomers of the product cyanohydrin were obtained with high enantioselectivity by switching the center metal of the catalyst from titanium to gadolinium. Yamamoto allylation constructed the C-5 chiral carbon in the alpha,beta-unsaturated lactone moiety. A direct catalytic asymmetric aldol reaction of an alkynyl ketone using LLB catalyst constructed the chirality at C-9 with the introduction of a synthetically versatile alkyne moiety, which was later converted to cis-vinyl iodide, the substrate for the subsequent Stille coupling for the triene synthesis. Noyori reduction produced the secondary alcohol at C-11 from the acetylene ketone 6 with excellent selectivity. Importantly, all the stereocenters were constructed under catalyst control in this synthesis. This strategy should be useful for rapid synthesis of stereoisomers of fostriecin.

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

Related Products of 37366-09-9, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a Article£¬once mentioned of 37366-09-9

Asymmetrische Katalysen. LXXXII. Enantioselektive Hydrierung von 4-Oxoisophoron

Enantioselective hydrogenation of 4-oxoisophorone 1, catalysed by BINAP-RuII complexes, gives the corresponding saturated diketone 2 in 80percent chemical yield and 50percent enantiomeric excess.By repeated crystallisation from petroleum ether/dichloromethane 4/1 the diketone 2 is obtained optically pure in 25percent total yield.The monoalcohol 3 is formed as a byproduct of the hydrogenation.The formation of 3 can be suppressed by using the monomethyl-eol ether 4 as a substrate.Catalytic hydrogenation of 4 in methanol gives exclusively the dimethylketal 5, which upon acidic hydrolysis is transformed into the diketone 2 in 50percent ee.

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

Reference of 301224-40-8, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 301224-40-8, Name is (1,3-Dimesitylimidazolidin-2-ylidene)(2-isopropoxybenzylidene)ruthenium(VI) chloride, molecular formula is C31H38Cl2N2ORu. In a Patent£¬once mentioned of 301224-40-8

MACROCYCLE DERIVATIVES USEFUL AS INHIBITORS OF BETA-SECRETASE (BACE)

The present invention is directed to macrocycle derivatives, pharmaceutical compositions containing them and their use in the treatment of Alzheimer’s disease (AD) and related disorders. The compounds of the invention are inhibitors of beta-secretase, also known as beta-site cleaving enzyme and BACE, BACE1, Asp2 and memapsin2.

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

Synthesis, structure, and reactivity of RuII complexes with trimethylsilylethinylamidinate ligands

The mononuclear amidinate complexes [(eta6-cymene)-RuCl(1a)] (2) and [(eta6-C6H6)RuCl(1b)] (3), with the trimethylsilyl-ethinylamidinate ligands [Me3SiC?CC(N-c-C 6H11)2]- (1a-) and[Me3SiC?CC(N-i-C3H7)2] – (1b-) were synthesized in high yields by salt metathesis. In addition, the related phosphane complexes[(eta5- C5H5)Ru(PPh3)(1b)] (4a) [(eta5- C5Me5)Ru(PPh3)(1b)] (4b), and [(eta6-C6H6)Ru(PPh3)(1b)](BF 4) (5-BF4) were prepared by ligand exchange reactions. Investigations on the removal of the trimethyl-silyl group using [Bu 4N]F resulted in the isolation of [(eta6-C 6H6)Ru(PPh3){(N-i-C3H 7)2CC?CH}](BF4) (6-BF4) bearing a terminal alkynyl hydrogen atom, while 2 and 3 revealed to yield intricate reaction mixtures. Compounds 1a/b to 6-BF4 were characterized by multinuclear NMR (1H, 13C, 31P) and IR spectroscopy and elemental analyses, including X-ray diffraction analysis of 1b, 2, and 3. Copyright

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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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Stereoselective Synthesis of 2 Z,4 e -Configured Dienoates through Tethered Ring Closing Metathesis

A two-step sequence leading from racemic allylic alcohols and vinylacetic acid to ethyl (2Z,4E)-dienoates is described. The sequence involves Steglich esterification of the reactants, followed by a one-pot ring closing metathesis-base induced elimination-alkylation reaction to furnish the products in high stereoselectivity. Trapping of the intermediate sodium carboxylates is accomplished efficiently using Meerwein’s salt Et3OBF4.

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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, Safety of Dichloro(benzene)ruthenium(II) dimer

Selective Complexation of Li+ in Water at Neutral pH Using a Self-Assembled Ionophore

A trinuclear metallamacrocycle was obtained by assembly of a tridentate ligand and a ruthenium complex in water at neutral pH. The complex acts as a potent ionophore for lithium ions with a Li+/Na+ selectivity of 10000:1. Copyright

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Safety of Dichloro(benzene)ruthenium(II) dimer, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 37366-09-9, in my other articles.

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

In an article, published in an article, once mentioned the application of 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer,molecular formula is C12H12Cl4Ru2, is a conventional compound. this article was the specific content is as follows.Recommanded Product: Dichloro(benzene)ruthenium(II) dimer

Highly versatile heteroditopic ligand scaffolds for accommodating group 8, 9 & 11 heterobimetallic complexes

Two highly versatile xanthene scaffolds containing pairs of heteroditopic ligands were found to be capable of accommodating a range of transition metal ions, including Au(i), Ir(i), Ir(iii), Rh(i), and Ru(ii) to generate an array of heterobimetallic complexes. The metal complexes were fully characterised and proved to be stable in the solid and solution state, with no observed metal-metal scrambling. Heterobimetallic complexes containing the Rh(i)/Ir(i) combinations were tested as catalysts for the two-step dihydroalkoxylation reaction of alkynediols and sequential hydroamination/hydrosilylation reaction of alkynamines.

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