Category: ruthenium-catalysts

Application 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.

Dynamic Memory Effects in the Mechanochemistry of Cyclic Polymers

Cyclic polymers containing multiple gem-dichlorocyclopropane (gDCC) mechanophores along their backbone were prepared using ring expansion metathesis polymerization. The mechanochemistry of the cyclic polymers was investigated using pulsed ultrasonication. The fraction of gDCC mechanophores that are activated per chain halving event (phi) was compared to that of linear analogs. For 167 kDa cyclic polymer, phi = 0.38, vs phi = 0.62 for 158 kDa linear polymers analogs, even though cyclic chain fragmentation necessarily proceeds through a linear intermediate of comparable composition to the initially linear systems. Ozonolysis of the mechanochemical products further shows that the mechanochemical “activation zone” in the cyclic polymer is less continuous than in the linear polymer. These results suggest that the linear intermediate in cyclic polymer fragmentation undergoes subsequent scission during the same high strain rate extensional event in which it is formed and furthermore retains at least a partial memory of its original cyclic conformation at the time of fragmentation.

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

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., Recommanded Product: (1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium

Synthesis and high-resolution NMR structure of a beta3- octapeptide with and without a tether introduced by olefin metathesis

Bridging between (i)- and (i+3)-positions in a beta3-peptide with a tether of appropriate length is expected to prevent the corresponding 314-helix from unfolding (Fig. 1). The beta3-peptide H-beta3hVal-beta3hLys-beta3hSer(All) -beta3hPhe-beta3hGlu-beta3hSer(All) -beta3hTyr-beta3hIle-OH (1; with allylated betahSer residues in 3-and 6-position), and three tethered beta-peptides 2 – 4 (related to 1 through ring-closing metathesis) have been synthesized (solid-phase coupling, Fmoc strategy, on chlorotrityl resin; Scheme). A comparative CD analysis of the tethered beta-peptide 4 and its non-tethered analogue 1 suggests that helical propensity is significantly enhanced (threefold CD intensity) by a (CH2)4 linker between the beta3hSer side chains (Fig. 2). This conclusion is based on the premise that the intensity of the negative Cotton effect near 215 nm in the CD spectra of beta3-peptides represents a measure of ‘helical content’. An NMR analysis in CD3OH of the two beta3- octapeptide derivatives without (i.e., 1) and with tether (i.e., 4; Tables 1 – 6, and Figs. 4 and 5) provided structures of a degree of precision (by including the complete set of side chainside chain and side chain – backbone NOEs) which is unrivaled in beta-peptide NMR-solution-structure determination. Comparison of the two structures (Fig. 5) reveals small differences in side-chain arrangements (separate bundles of the ten lowest-energy structures of 1 and 4, Fig. 5, A and B) with little deviation between the two backbones (superposition of all structures of 1 and 4, Fig. 5, C). Thus, the incorporation of a CH 2-O-(CH2)4-O-CH2 linker between the backbone of the beta3-amino acids in 3-and 6-position (as in 4) does accurately constrain the peptide into a 314-helix. The NMR analysis, however, does not suggest an increase in the population of a 3 14-helical backbone conformation by this linkage. Possible reasons for the discrepancy between the conclusion from the CD spectra and from the NMR analysis are discussed.

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

32993-05-8, Name is Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II), molecular formula is C41H35ClP2Ru, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 32993-05-8, Recommanded Product: 32993-05-8

Preparation of diazoalkane complexes of ruthenium and their cyclization reactions with alkenes and alkynes

The diazoalkane complexes [Ru(eta5-C5H 5)(N2CAr1Ar2)(PPh3)(L)]BPh4 (1-5: Ar1 = Ar2 = Ph (a), Ar1 = Ph and Ar2 = p-tolyl (b), Ar1Ar2 = C 12H8 (c), Ar1 = Ph and Ar2 = PhCO (d); L = PPh3 (1), P(OMe)3 (2), P(OEt)3 (3), PPh(OEt)2 (4), ButNC (5)) were prepared by allowing the chloro compounds RuCl(eta5-C5H5)(PPh3)(L) to react with the diazoalkanes Ar1Ar2CN2 in ethanol. Treatment of complexes 1-5 with ethylene (CH2=CH2) under mild conditions (1 atm, room temperature) led not only to the eta2-ethylene complexes [Ru(eta5-C5H5)(eta2-CH 2=CH2)(PPh3)(L)]BPh4 (10-14) but also to dipolar (3 + 2) cycloaddition, affording the 4,5-dihydro-3H-pyrazole derivatives [Ru(eta5-C5H5){eta1- N=NC(Ar1Ar2)CH2CH2}(PPh3)(L)]BPh4 (6-9). Acrylonitrile (CH2=C(H)CN) reacted with diazoalkane complexes 2 and 3 to give the 1H-pyrazoline derivatives [Ru(eta5-C 5H5){eta1-N=C(CN)CH2C(Ar1Ar2)NH} (PPh3)(L)]BPh4 (19, 20). However, reactions with propylene (CH2=C(H)CH3), maleic anhydride (ma, CH=CHCO(O)CO) and dimethyl maleate (dmm, CH3OCOCH=CHOCOCH3) led to the eta2-alkene complexes [Ru(eta5-C5H 5)(eta2-R1CH=CHR2)(PPh3)(L)]BPh4 (17-22). Treatment of the diazoalkane complexes 1 and 2 with acetylene CH?CH under mild conditions (1 atm, room temperature) led to dipolar cycloaddition, affording the 3H-pyrazole complexes [Ru(eta5-C 5H5){eta1-N=NC(Ar1Ar2)CH=CH}(PPh 3){P(OMe)3}]BPh4 (24), whereas reactions with the terminal alkynes PhC?CH and ButC?CH gave the vinylidene derivatives [Ru(eta5-C5H5){=C=C(H) R}(PPh3){P(OMe)3}]BPh4 (25, 26). The alkyl propiolates HC?CCOOR1 (R1 = Me, Et) also reacted with complexes 2 to give the 3H-pyrazole complexes [Ru(eta5-C5H 5){eta1-N=NC(Ar1Ar2)C(COOR1)=CH}(PPh3){P(OMe) 3}]BPh4 (27, 28). The complexes were characterized by spectroscopy and by X-ray crystal structure determinations of [Ru(eta5-C5H5){eta1-N=C(CN) CH2C(Ph)(p-tolyl)NH}(PPh3){P(OMe)3}]BPh 4 (19b), [Ru(eta5-C5H5) {eta2-CH=CHCO(O)CO}(PPh3){P(OMe)3}]BPh 4 (21), and [Ru(eta5-C5H5) {eta1-N=NC(C12H8)CH=CH}(PPh 3){P(OMe)3}]BPh4 (24c).

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

Application of 32993-05-8. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 32993-05-8, Name is Chlorocyclopentadienylbis(triphenylphosphine)ruthenium(II). In a document type is Article, introducing its new discovery.

Ruthenium hydride complexes of chiral and achiral diphosphazane ligands and asymmetric transfer hydrogenation reactions

The half-sandwhich ruthenium chloro complexes bearing chelated diphosphazane ligands, [(eta5-Cp)RuCl{kappa2-P,P-(RO)2PN(M e)P(OR)2}] [R = C6H3Me2-2,6] (1) and [(eta5-Cp*)RuCl{kappa2- P,P-X2PN(R)PYY?}] [R = Me, X = Y = Y? = OC6H5 (2); R = CHMe2, X2 = C20H12O2, Y = Y? = OC6H5 (3) or OC6H4tBu-4 (4)] have been prepared by the reaction of CpRu(PPh3)2Cl with (RO)2PN(Me)P(OR)2 [R = C6H3Me2-2,6 (L1)] or by the reaction of [Cp*RuCl2]n with X2PN(R)PYY? in the presence of zinc dust. Among the four diastereomers (two enantiomeric pairs) possible for the “chiral at metal” complexes 3 and 4, only two diastereomers (one enantiomeric pair) are formed in these reactions. The complexes 1, 2, 4 and [(eta5-Cp)RuCl{kappa2-P,P-Ph2PN((S) -*CHMePh)PPhY}] [Y = Ph (5) or N2C3HMe2-3,5 (SCSPRRu)-(6)] react with NaOMe to give the corresponding hydride complexes [(eta5-Cp)RuH{kappa2-P,P-(RO)2PN(Me )P(OR)2}] (7), [(eta5-Cp*)RuH{kappa2-P, P?-X2PN(R)PY2}] [R = Me, X = Y = OC6H5 (8); R = CHMe2, X2 = C20H12O2, Y = OC6H4tBu-4 (9)] and [(eta5-Cp)RuH{kappa2-P,P-Ph2PN((S)- *CHMePh)PPhY}][Y = Ph (10) or N2C3HMe2-3,5 (SCSPRRu)-(11a) and (SCSPSRu)-(11b)]. Only one enantiomeric pair of the hydride 9 is obtained from the chloro precursor 4 that bears sterically bulky substituents at the phosphorus centers. On the other hand, the optically pure trichiral complex 6 that bears sterically less bulky substituents at the phosphorus gives a mixture of two diastereomers (11a and 11b). Protonation of complex 7 using different acids (HX) gives a mixture of [(eta5-Cp)Ru(eta2-H2){kappa 2-P,P-(RO)2PN(Me)P(OR)2}]X (12a) and [(eta5-Cp)Ru(H)2{kappa2-P,P-(RO) 2PN(Me)P(OR)2}]X (12b) of which 12a is the major product independent of the acid used; the dihydrogen nature of 12a is established by T1 measurements and also by synthesizing the deuteride analogue 7-D followed by protonation to obtain the D-H isotopomer. Preliminary investigations on asymmetric transfer hydrogenation of 2-acetonaphthone in the presence of a series of chiral diphosphazane ligands show that diphosphazanes in which the phosphorus centers are strong pi-acceptor in character and bear sterically bulky substituents impart moderate levels of enantioselectivity. Attempts to identify the hydride intermediate involved in the asymmetric transfer hydrogenation by a model reaction suggests that a complex of the type, [Ru(H)(Cl){kappa2-P,P-X2PN(R)PY2}(sol vent)2] could be the active species in this transformation.

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

Application of 37366-09-9. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer. In a document type is Article, introducing its new discovery.

Novel microwave synthesis of half-sandwich [(eta6-C 6H6)Ru] complexes and an evaluation of the biological activity and biochemical reactivity

We have used a novel microwave-assisted method to synthesize a pair of half-sandwich ruthenium-arene-thiosemicarbazone complexes of the type [(eta6-C6H6Ru(TSC)Cl]PF6. The thiosemicarbazone (TSC) ligands are 2-(anthracen-9-ylmethylene) hydrazinecarbothioamide and 2-(anthracen-9-ylmethylene)-N- ethylhydrazinecarbothioamide derived from 9-anthraldehyde. The complexes are moderately strong binders of DNA, with binding constants of 104 m-1. They are also strong binders of human serum albumin, having binding constants of the order of 105 m-1. The complexes show some in vitro anticancer activity against human colon cancer cells, Caco-2 and HCT-116, with positive therapeutic indices. They did not show any activity as antibacterial agents against the organisms that were studied. Copyright

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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: 37366-09-9

Optically active P5-deltacyclenes: Selective oxidation, ligand properties, and a diastereoselective rearrangement reaction

Cage-chiral tetra-tert-butyl-P5-deltacyclene 5 is accessible as a pair of highly enriched enantiomers 5? and 5?. The only secondary phosphorus atom P1 of the cage can be selectively oxidized by reaction with t-BuOOH. The P1-oxo species 9a? and 9a?, allow the direct determination of their ee values. Oxidation occurs with the complete retention of the optical activity of the compounds. The chiroptical properties of 9a? and 9a? are strongly dominated by their cage chirality, the oxygen atom does not contribute significantly. Elemental sulfur and selenium oxidize P5 with high preference to yield P5-thio- and P5-seleno-P5-deltacyclenes 10 and 11 of the intact cages again. Longer reaction time and more than stoichiometric amounts of selenium, leads to tri-seleno-P5-tetracycloundecane 12, a partially opened oxidized rearrangement product. The ligand properties of racemic 9a were determined. Diphosphetane phosphorus atom P2 of 9a is the active donor center to bind a Cr(CO)5 fragment, but a tautomerization of 9a takes place if [(benzene)RuCl2]2 is added. A hydrogen atom migrates from P1 to the oxygen atom to form a phosphinous acid ligand. The lone pair of P1 is regenerated and acts as the active ligand function of the cage in this case. As for 5, the base n-BuLi induces an efficient cage rearrangement reaction of 9a, where P1 and the neighboring carbon atom C4 containing its t-Bu substituent change places. C4 moves to its new position without breaking the bond with P5, this way forming the novel P1-oxo-P5-norsnoutene cage in a highly diastereoselective process.

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

37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2, belongs to ruthenium-catalysts compound, is a common compound. In a patnet, once mentioned the new application about 37366-09-9, category: ruthenium-catalysts

Synthesis, spectral and structural studies of water soluble arene ruthenium (II) complexes containing 2,2?-dipyridyl-N-alkylimine ligand

A series of water soluble complexes of general formula [(eta6- arene)Ru{(C5H4N)2CNRi}Cl]PF6 have been prepared by the reaction of [{(eta6-arene)RuCl 2}2] with appropriate 2,2?-dipyridyl-N-alkylimine ligands (dpNRi) in the presence of NH4PF6 (where; R = Me or Et; arene = p-cymene, C6Me6, C6H 6). The 2,2?-dipyridyl-N-alkylimine ligands are prepared by reaction of 2,2?-dipyridyl ketone with the corresponding alkylamine. The complexes are readily obtained as air stable yellow to dark brown solids by simple stirring at room temperature. The complexes are isolated as their hexafluorophosphate salts and characterized on the basis of spectroscopic data. The molecular structure of representative complex [(eta6-C 6Me6)Ru{(C5H4N)2CN-Me}Cl] PF6 has been determined by single crystal X-ray diffraction studies.

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

Application of 20759-14-2. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 20759-14-2, Name is Ruthenium(III) chloride hydrate

Optimising the synthesis, polymer membrane encapsulation and photoreduction performance of Ru(II)- and Ir(III)-bis(terpyridine) cytochrome c bioconjugates

Ruthenium(ii) and iridium(iii) bis(terpyridine) complexes were prepared with maleimide functionalities in order to site-specifically modify yeast iso-1 cytochrome c possessing a single cysteine residue available for modification (CYS102). Single X-ray crystal structures were solved for aniline and maleimide Ru(ii) 3 and Ru(ii) 4, respectively, providing detailed structural detail of the complexes. Light-activated bioconjugates prepared from Ru(ii) 4 in the presence of tris(2-carboxyethyl)-phosphine (TCEP) significantly improved yields from 6% to 27%. Photoinduced electron transfer studies of Ru(ii)-cyt c in bulk solution and polymer membrane encapsulated specimens were performed using EDTA as a sacrificial electron donor. It was found that membrane encapsulation of Ru(ii)-cyt c in PS140-b-PAA48 resulted in a quantum efficiency of 1.1 ¡À 0.3 ¡Á 10-3, which was a two-fold increase relative to the bulk. Moreover, Ir(iii)-cyt c bioconjugates showed a quantum efficiency of 3.8 ¡À 1.9 ¡Á 10-1, equivalent to a ?640-fold increase relative to bulk Ru(ii)-cyt c.

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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, Application In Synthesis of Dichloro(benzene)ruthenium(II) dimer

Arene-ruthenium(II) and bis(allyl)-ruthenium(IV) complexes containing 2-(diphenylphosphanyl)pyridine ligands: Potential catalysts for nitrile hydration reactions?

Neutral arene-ruthenium(II) complexes [RuCl2(eta6- arene){kappa1-(P)-PPh2py}] and [RuCl2(eta 6-arene){kappa1-(P)-PPh2(py-4-NMe 2)}] (arene = benzene, p-cymene, mesitylene, hexamethylbenzene) have been synthesized and studied as potential catalysts for the selective hydration of nitriles to amides using benzonitrile as a model substrate. The effectiveness of these complexes was low due to the high tendency of the 2- (diphenylphosphanyl)pyridine ligands to form stable kappa2-(P,N)- chelate rings, as demonstrated by NMR spectroscopy and catalytic experiments performed with the isolated cationic derivatives [RuCl(eta6-arene) {kappa2-(P,N)-P N}][SbF6] [P N = PPh2py, PPh2(py-4-NMe2)]. Despite its reluctance to adopt a chelating kappa2-(P,N) coordination mode, cooperative effects of the bulky 2-(diphenylphosphanyl)pyridine ligand PPh2(py-6-tert-amyl) were not observed in complexes [RuCl2(eta6-arene) {kappa1-(P)-PPh2(py-6-tert-amyl)}] (arene = benzene, p-cymene). The novel bis(allyl)-ruthenium(IV) derivatives [RuCl(eta 3:eta3-C10H16) {kappa2-(P,N)-P N}][SbF6] [P N = PPh2py, PPh2(py-4-NMe2)] and [RuCl2(eta3: eta3-C10H16){kappa1-(P)-PPh 2(py-6-tert-amyl)}] (C10H16 = 2,7-dimethylocta-2,6-diene-1,8-diyl) were also synthesized and fully characterized, and again led to modest conversions in the benzonitrile hydration reaction. Improvements in the catalytic activities of complexes [RuCl 2(eta6-p-cymene){kappa1-(P)-PPh 2py}], [RuCl(eta6-p-cymene){kappa2-(P,N)- PPh2py}][SbF6] and [RuCl(eta3: eta3-C10H16){kappa2-(P,N)- PPh2py}][SbF6] were observed in the presence of excess PPh2py due to the in situ formation of the catalytically more active dication [Ru{kappa2-(P,N)-PPh2py}3] 2+.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 37366-09-9 is helpful to your research., Application In Synthesis of Dichloro(benzene)ruthenium(II) dimer

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

Electric Literature of 10049-08-8, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 10049-08-8, Name is Ruthenium(III) chloride, molecular formula is Cl3Ru. In a Article£¬once mentioned of 10049-08-8

Experimental observation of nonlinear circular dichroism in a pump-probe experiment

We present experimental evidence of nonlinear optical activity in a time-resolved pump-probe experiment carried out in a liquid of chiral molecules. By modulating the polarization of the probe or of the pump, we measure a variation of the circular dichroism (CD) induced by the pump. Application of these techniques to time-resolved spectroscopy of excited molecules is discussed.

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 10049-08-8 is helpful to your research., Electric Literature of 10049-08-8

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