Category: 37366-09-9

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Guanidinates as chelating anionic ligands for early, middle and late transition metals: Syntheses and crystal structures of [Ti{i]2(NPh)2CNEt2}2Cl2, [Ru{ii2-(NPh)2CNHPh}3] and [Pt{ri2-(NPh)2CNHPh}2]

Treatment of the dimeric ruthenium halide complex [Ru(r|-C6H6)Q2]2 with 1,2,3-triphenylguanidine provided the tris-chelate [Ru{r|2-(NPh)2CNHPh}3] with loss of the aromatic ligand and metal oxidation. This product may also be prepared by treatment of the previously reported [Ru(n-/>-PrrC6H4Me){ri2-(NPh)2CNHPh}Cl] with bases (KOH, LiN’Pr2, NEtj). Complexes containing chelating guanidinate ligands are also available by means of metathesis of the monolithiated ligands Li[C(NR)2NR2] with metal halide complexes, as exemplified by the synthesis of the square planar bis-chelate [Pt{n2-(NPh)2CNHPh}2] from [Pt(PhCN)2ClJ and [Ti{n2-(NPh)2CN(Et)2}2Cl2] from [TiCl4(THF)2]. The characterisation of these complexes allows a comparison of the co-ordination properties of chelating guanidinates with early, middle and late transition metals. The Royal Society of Chemistry 2000.

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

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Quinones synthesis via hydrogen peroxide oxidation of dihydroxy arenes catalyzed by homogeneous and macroporous-polymer-supported ruthenium catalysts

Ruthenium(II)/dimethyl phenyloxazoline (Ru(II)/dm-Pheox) complex 2a and its macroporous-polymeric-catalyst 4 were found to be very rapid and efficient catalysts in the hydrogen peroxide oxidation of 1,2- and 1,4-dihydroxy arenes. Most of the quinone products were delivered in 99% yield. The polymeric-catalyst 4 could be reused at least five times.

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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, Product Details of 37366-09-9

Half sandwich complexes of chalcogenated pyridine based bi-(N, S/Se) and terdentate (N, S/Se, N) ligands with (eta6-benzene)ruthenium(ii): Synthesis, structure and catalysis of transfer hydrogenation of ketones and oxidation of alcohols

The half sandwich complexes [(eta6-C6H 6)Ru(L)Cl][PF6] (1-5) have been synthesized by the reactions of (2-arylchalcogenomethyl)pyridine [L = L1-L3] and bis(2-pyridylmethyl)chalcogenide [L = L4-L5] (chalcogen = S, Se; Ar = Ph/2-pyridyl for S, Ph for Se) with [(eta6-C6H 6)RuCl2]2, at room temperature followed by treatment with NH4PF6. Their HR-MS, 1H, 13C{1H} and 77Se{1H} NMR spectra have been found characteristic. The single crystal structures of 1-5 have been established by X-ray crystallography. The Ru has pseudo-octahedral half sandwich “piano-stool” geometry. The complexes 1-5 have been found efficient for catalytic oxidation of alcohols with N-methylmorpholine-N-oxide (NMO) and transfer hydrogenation of ketones with 2-propanol (at moderate temperature 80 C) as TON values are up to 9.9 ¡Á 103 and 9.8 ¡Á 103 respectively for the two catalytic reactions. On comparing the required catalyst loading for good conversions and reaction time for the present complexes with those reported in literature for other transfer hydrogenation/oxidation catalysts, it becomes apparent that 1-5 have good promise. The complexes of Se ligands have been found more efficient than their sulphur analogues. The complexes of bidentate ligands are more efficient than those of terdentate, due to difficult bond cleavage in the case of latter. These orders of efficiency are supported by DFT calculations. The calculated bond lengths/angles by DFT are generally consistent with the experimental ones.

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

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Facile synthesis of heterobimetallic [FeII(mu-diphosphine)RuII] and homobimetallic [FeII(mu-diphosphine)FeII] complexes and their in vitro cytotoxic activity on cisplatin-resistant cancer cells

A series of heterobimetallic [Fe,Ru] and homobimetallic [Fe,Fe] complexes, featuring mu -diphosphine bridges between the two metal centres, are reported along with their in vitro cytotoxicity activity on the A2780cisR cell-line. The known starting material [CpFe(CO)2(CH3)] (Cp = eta5-C5H5) (1) was reacted with dppe (1,2-bis(diphenylphosphino)ethane) forming the known mononuclear kappa1-dppe complex: [CpFe(CO)(COCH3)(kappa1-dppe)] (2) and the known dinuclear complex: and [[CpFe(CO)(COCH3)]2(mu-dppe)] (3). Dimer cleavage reactions between complex 2 and two ruthenium arene complexes [(eta6-p-cymene)RuCl2]2 and [(eta6-benzene)RuCl2]2 formed two new heterobimetallic complexes: [CpFe(CO)(COCH3)(mu-dppe)Ru(eta6-cymene)Cl2] (4) and [CpFe(CO)(COCH3)(mu-dppe)Ru(eta6-C6H6)Cl2] (5). A homobimetallic system, [[CpFe(CO)(I)]2(mu-dppb)] (6) was obtained by the facile reaction between of [CpFe(CO)2I] and 1,4-bis(diphenylphosphino)butane (dppb). Complex 6 was methylated using MeLi to generate the more lipophilic complex [[CpFe(CO)(CH3)]2(mu-dppb)] (7). All of the complexes were fully characterized by spectroscopy (1H, 13C {1H}, 31P {1H} NMR; FTIR, UV?Vis), and high resolution mass spectrometry (HRMS). Density functional theory calculations (DFT) (Level of theory B3LYP, basis set for H, C, P, O, Cl is 6-31+G(d,p) and for Ru, Fe, I is DGDZVP) on complexes 5 and 6 are also reported. An excellent agreement between the DFT calculated infra-red (IR) spectra of the optimised geometries of 5 and 6 was found with the experimentally determined spectra. In vitro cytotoxicity studies of all complexes was carried out on A2780cisR (cisplatin resistant ovarian cancer cell-line) and compared to cisplatin as a positive control and RAPTA-C as a negative control. Although limited to only one cell-line, the results show that the heterobimetallic complexes 4 and 5 are the most cytotoxic (IC50 = 4.9 ¡À 0.4 muM and 6.5 ¡À 0.1 muM respectively), whilst the dinculear [Fe,Fe] complexes exhibit no, or very low cytotoxicity.

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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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Electric Literature of 37366-09-9, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.37366-09-9, Name is Dichloro(benzene)ruthenium(II) dimer, molecular formula is C12H12Cl4Ru2. In a patent, introducing its new discovery.

Aminooxazolinate; a chiral amidinate analogue

High levels of diastereoselection with respect to chirality-at-metal are achieved at equilibrium for complexes containing a new and available range of diazaallyl ligands.

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

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Synthesis of mu-diborolyl triple-decker complexes [CpCo(1,3-C 3B2Me5)Ru(arene)]+

Cationic triple-decker complexes [CpCo(1,3-C3B 2Me5)Ru(arene)]PF6 (arene is benzene (2a), p-cymene (2b)) with a bridging diborolyl ligand were synthesized by the reaction of the sandwich anion [CpCo(1,3-C3B2Me5)]- (1) with [(arene)RuCl2]2. The structure of [2b]PF6 was confirmed by X-ray diffraction analysis.

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

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Chiral pyridylamino-ruthenium(ii) complexes: Synthesis, structure and catalytic properties in Diels-Alder reactions

Half-sandwich complexes [(eta6-arene)RuCl(pyam)][SbF 6] (pyam = Ln = N-(2-pyridylmethyl)-(R)-1-phenylethylamine (L1), N-(2-pyridylmethyl)-(R)-1-naphthylethylamine (L2), N-(2-quinolylmethyl)-(R)-1-naphthylethylamine (L3), N-(2-pyridylmethyl)-(R)-1-cyclohexylethylamine (L4), N-(2-pyridylmethyl)-(1R,2S,4R)-1-bornylamine (L5)) have been synthetised and characterised. Treatment of these compounds with AgSbF 6 generates dicationic complexes [(eta6-arene)Ru(pyam) (H2O)]2+ which act as enantioselective catalysts for the Diels-Alder reactions of methacrolein and cyclopentadiene. The catalytic reactions occur quickly at room temperature with good exo: endo selectivity (from 84: 16 to 98: 2) and moderate enantioselectivity (up to 74% ee). The molecular structures of the chloride complexes (RRu,S N,RC)-[(eta6-p-MeC6H 4iPr)RuClL1][SbF6], (RRu,S N,SC2)-[(eta6-p-MeC6H 4iPr)RuClL5][SbF6], and that of the aqua complex (RRu,SN,SC2)-[(eta6-p- MeC6H4iPr)RuL5(H2O)][SbF 6]2, were determined by X-ray diffractometric methods. The distinctive variations observed in the molecular structures of these complexes only concern the puckering parameters of the metallacycle and the relative disposition of substituents within this ring. A clear trend to localise the most steric demanding substituents at equatorial positions is evident from the structural study. The Royal Society of Chemistry 2008.

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

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Planar chirality in tethered eta6:eta1-(phosphinophenylenearene-P)ruthenium(II) complexes and their potential use as asymmetric catalysts

Reaction of 2-dicyclohexylphosphinobiphenyl with [(eta6-benzene)RuCl2]2 yielded the tethered complex [Ru(eta6:eta1-dicyclohexylphosphinobiphenyl-P)Cl2 ], 1, rather than a bridge-splitting product, [(eta6-benzene)Ru(L)Cl2], that is often observed. Treatment of [(eta6-benzene)RuCl2]2 with 2-dicyclohexylphosphino-2?-(N,N-dimethylamino)biphenyl yielded the planar chiral, tethered complex [Ru(eta6:eta1-2-dicyclohexylphosphino-2-?-(N,N-d imethylamino)biphenyl-P)Cl2], 2. Abstraction of a chloride from 2 with AgSbF6 and treatment with PPh3 selectively gave the chiral-at-metal complex [anti-Ru(eta6:eta1-2-dicyclohexylphosphino-2?-(N ,N-dimethylamino)-biphenyl-P) (PPh3)Cl]SbF6, 3a, which underwent spontaneous resolution upon crystallization. The Me2N group is coplanar with the eta6-phenyl ring in the cations and directs attack at the metal center, as well as determining the thermodynamic stability of anti versus syn epimers. The dication derived from enantiopure 3a catalyzed the Diels-Alder reaction of methacrolein and cyclopentadiene with modest (19-23%) enantioselectivity. Analogues of 2 and 3a containing 2-(dicyclohexylphosphino)-2?-methylbiphenyl were also prepared. We have found that epimerization at the metal center is slow in these compounds. Averaged NMR spectra at ambient temperatures are observed, however, due to rapid conformational interconversions that can be slowed at low temperature.

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

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ENANTIOSELECTIVE SYNTHESIS OF 6-AMINO-7-HYDROXY-4, 5, 6, 7-TETRAHYDRO-IMIDAZO [4, 5, 1-JK] [1] -BENZAZEPIN-2 [1H] -ONE AND ZILPATEROL

This invention relates to a process for the hydrogenation of a ketooxime to selectively form an aminoalcohol stereoisomer, and, in particular, to a process for the hydrogenation of 4,5-dihydro-imidazo[4,5,l-jk][1]benzazepin-2,6,7[1H]-trione-6-oxime or a salt thereof to selectively form a stereoisomer of 6-amino-7-hydroxy-4, 5, 6, 7-tetrahydro-imidazo[4,5,1-jk][1]-benzazepin-2[1H]-one or a salt thereof. This invention also relates to the use of the 6-amino-7-hydroxy-4, 5, 6, 7-tetrahydro-imidazo[4,5,1-jk][1]-benzazepin- 2[1H]-one hydrogenation product or a salt thereof to selectively make a stereoisomer of zilpaterolor a salt thereof, as well as the use of such a zilpaterol stereoisomer or salt in methods of treatment and medicaments for animals.

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

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ALKYL CARBAMATE-SUBSTITUTED BUTYROLACTONES SERVING AS LIPASE INHIBITORS

The invention relates to substituted beta-lactones (oxetanones) of general formula (I), in which R1, R2 and n have the meanings cited in the description, and to medicaments, which contain these compounds and which have a pancreas lipase-inhibiting effect. The invention also relates to a method for producing the compounds of formula (I) and to intermediate products of this method

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