Category: 37366-09-9

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New ruthenium(II)-letrozole complexes as anticancer therapeutics

Novel ruthenium-letrozole complexes have been prepared, and cell viability of two human cancer cell types (breast and glioblastoma) was determined. Some ruthenium compounds are known for their cytotoxicity to cancer cells, whereas letrozole is an aromatase inhibitor administered after surgery to post-menopausal women with hormonally responsive breast cancer. A significant in vitro activity was established for complex 5¡¤Let against breast cancer MCF-7 cells and significantly lower activity against glioblastoma U251N cells. The activity of 5¡¤Let was even higher than that of 4, a compound analogous to the well-known drug RAPTA-C. Results from the combination of 5¡¤Let (or 4) with 3-methyladenine (3-MA) or with curcumin, respectively, revealed that the resultant cancer cell death likely involves 5¡¤Let-induced autophagy.

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

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Thiophenolato-bridged dinuclear arene ruthenium complexes: A new family of highly cytotoxic anticancer agents

New cationic diruthenium complexes of the type [(arene)2Ru 2(SPh)3]+, arene being C6H 6, p-iPrC6H4Me, C6Me 6, C6H5R, where R = (CH2) nOC(O)C6H4-p-O(CH2) 6CH3 or (CH2)nOC(O)CHCHC 6H4-p-OCH3 and n = 2 or 4, are obtained from the reaction of the corresponding precursor [(arene)RuCl2] 2 and thiophenol and isolated as their chloride salts. The complexes have been fully characterised by spectroscopic methods and the solid state structure of [(C6H6)2Ru2(SPh) 3]+, crystallised as the hexafluorophosphate salt, has been established by single crystal X-ray diffraction. The complexes are highly cytotoxic against human ovarian cancer cells (cell lines A2780 and A2780cisR), with the IC50 values being in the submicromolar range. In comparison the analogous trishydroxythiophenolato compounds [(arene)2Ru 2(S-p-C6H4OH)3]Cl (IC50 values around 100 muM) are much less cytotoxic. Thus, it would appear that the increased antiproliferative effect of the arene ruthenium complexes is due to the presence of the phenyl or toluyl substituents at the three thiolato bridges. The Royal Society of Chemistry 2010.

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

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Mono and dinuclear complexes of half-sandwich platinum group metals (Ru, Rh and Ir) bearing a flexible pyridyl-thiazole multidentate donor ligand

The mononuclear cationic complexes [(eta6-C6H6)RuCl(L)]+ (1), [(eta6-p-iPrC6H4Me)RuCl(L)]+ (2), [(eta5-C5H5)Ru(PPh3)(L)]+ (3), [(eta5-C5Me5)Ru(PPh3)(L)]+ (4), [(eta5-C5Me5)RhCl(L)]+ (5), [(eta5-C5Me5)IrCl(L)]+ (6) as well as the dinuclear dicationic complexes [{(eta6-C6H6)RuCl}2(L)]2+ (7), [{(eta6-p-iPrC6H4Me)RuCl}2(L)]2+ (8), [{(eta5-C5H5)Ru(PPh3)}2(L)]2+ (9), [{(eta5-C5Me5)Ru(PPh3)}2(L)]2+ (10), [{(eta5-C5Me5)RhCl}2(L)]2+ (11) and [{(eta5-C5Me5)IrCl}2(L)]2+ (12) have been synthesized from 4,4?-bis(2-pyridyl-4-thiazole) (L) and the corresponding complexes [(eta6-C6H6)Ru(mu-Cl)Cl]2, [(eta6-p-iPrC6H4Me)Ru(mu-Cl)Cl]2, [(eta5-C5H5)Ru(PPh3)2Cl)], [(eta5-C5Me5)Ru(PPh3)2Cl], [(eta5-C5Me5)Rh(mu-Cl)Cl]2 and [(eta5-C5Me5)Ir(mu-Cl)Cl]2, respectively. All complexes were isolated as hexafluorophosphate salts and characterized by IR, NMR, mass spectrometry and UV-vis spectroscopy. The X-ray crystal structure analyses of [3]PF6, [5]PF6, [8](PF6)2 and [12](PF6)2 reveal a typical piano-stool geometry around the metal centers with a five-membered metallo-cycle in which 4,4?-bis(2-pyridyl-4-thiazole) acts as a N,N?-chelating ligand.

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

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B-substituted (arene)ruthenacarborane-sulfonium, -thioether and -mercaptan complexes: Mild single and double dealkylation and structural implications in the antipodal distance

Reactions of [RuCl2(eta6-arene)]2 (arene = benzene, p-cymene) with nido-[7-R-10-L-7,8-C2B9H 9]- in THF at room temperature for 3 d give the (arene)ruthenacarborane complexes closo-[3-Ru(eta6-arene)-1-R-8-L- 1,2-C2B9H9]+ {arene = benzene, R = H [L = Me2S (1a), THT (1b), EtPhS (1c)], R = Me [L = Me2S (2a)]; arene = p-cymene, R = H [L = Me2S (3a)]} and mercaptan closo-[3-Ru(eta6-arene)-1-R-8-HS-1,2-C2B 9H9] [arene = benzene, R = H (4), Me (5); arene = p-cymene, R = H (6)] in yields of 20-40% and 22-29%, respectively. The asymmetric ligand nido-[9-Me2S-7,8-C2B9H 10]- leads to the thioether complex closo-[3- Ru(eta6-benzene)-7-MeS-l,2-C2B9H 10] (8) in 34 % yield under the same reaction conditions. The crystal structure of 1a is described and compared with those of 4 and 8. The fully assigned 11B NMR spectroscopic data for a whole series of ruthenacarboranes having B-substituted sulfonium, thioether and mercaptan groups are presented. These data show a relation between antipodal cluster atom distances (antipodal distance) and antipodal effect (AE) in the crystal structures of these complexes and for other families of heteroboranes such as closo-[EB11H11] and closo-[EB9H9]. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.

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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, spectroscopic and electronic characterizations of two half sandwich ruthenium(II) complexes with 2-(2?-hydroxyphenyl)-benzoxazole and 4-picolinic acid ligands

The [(C6H6)RuCl(HPB)] and [(C6H6)RuCl2(C5H4 NCOOH)] complexes have been prepared and studied by IR, UV-Vis spectroscopy and X-ray crystallography. The complexes was prepared in reaction of [(C6H6)RuCl2]2 with 2-(2?-hydroxyphenyl)-benzoxazole or 4-picolinic acid in methanol. The electronic spectra of the obtained compounds have been calculated using the TDDFT method. The luminescence property of the half sandwich complex [(C6H6)RuCl(HPB)] was studied by the DFT method and the mechanism was suggested.

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

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PROCESS FOR PRODUCTION OF BIPHENYL DERIVATIVE

The invention provides a production method of a biaryltetrazole derivative useful as an intermediate for an angiotensin II receptor antagonist. The method comprises reacting an aryltetrazole derivative with a benzene derivative, deprotecting or reducing the resulting compound, and halogenating the deprotected or reduced compound

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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 AND REACTIONS OF SOME TRIPLE ALKOXO- AND THIOATO-BRIDGED ARENERUTHENIUM(II) COMPLEXES. X-RAY STRUCTURE DETERMINATION OF

Reaction of <2> (arene = C6H6, 1,4-MeC6H4CHMe2) with NaNH2 in CH3CN gives a dark oil which upon treatment with ROH/NaBPh4 (R = Me, Et) gives the triple bridged complexes (BPh4>.The structure of the benzene complex (R = Me) has been verified by X-ray analysis.The crystals are monoclinic, space group P21/n with a 11.725(4), b 15.573(5), c 18.739(2) Angstroem; beta 103.29(2)deg.These complexes undergo reactions with tertiary phosphines and hydrogen halides.There is also spectroscopic evidence for intermolecular exchange of the bridging alkoxo ligands on mixing pure solutions of the + cations (M = Ru, Os).Reaction of <2> with Pb(SEt) 2 in CH3CN gives the analogous + cations.

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

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Stepwise functionalization of two alkyne moieties in a dialkynylphosphine complex leading to the formation of a bifunctionalized phosphine complex bearing a stereogenic center at phosphorus

Stepwise functionalization of the two alkyne moieties in a dialkynylphosphine complex has been studied. The two alkynyl groups underwent stepwise hydrophosphination and insertion to yield two different substituents on the stereogenic phosphorus. Coordination of the dialkynylphosphine ligand PPh(C?CCH3)2 to the ruthenium center generated the complex [Ru(eta6-benzene){PPh(C?CCH3) 2}Cl2]. Removal of one Cl atom by AgPF6 followed by coordination of HPPh2 to ruthenium promoted the hydrophosphination reaction with high stereoselectivity. The hydrophosphination products then underwent insertion into the Pd-C bond of a cyclopalladated complex to give a bimetallic complex bearing a stereogenic phosphorus center with expected substituents. The product contains also a tridentate ligand chelating to palladium, which is believed to have been generated through a proton exchange process aided by palladium. Furthermore, this complex exists as two interconvertable conformations in a ratio of 3:1. The structures of complexes were confirmed by X-ray crystallographic analyses and 2D ROESY NMR studies.

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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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A convenient synthetic route to [CpRu(CH3CN3)]PF6

A convenient synthetic route to [CpRu(CH3CN)3]PF6 was presented. A new practical protocol that avoids the stoichiometric use of either thallium or silver salts for the synthesis of the given compound was described. It was shown that the introduction of the cyclopentadienyl ligand via ethanolic reduction of [(arene)RuCl2]2 in the presence of cyclopentadiene is a simple and convenient entry to cyclopentadienylruthenium complexes.

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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, 37366-09-9

SYNTHESIS AND REACTIONS OF SOME TRIPLE ALKOXO- AND THIOATO-BRIDGED ARENERUTHENIUM(II) COMPLEXES. X-RAY STRUCTURE DETERMINATION OF

Reaction of <2> (arene = C6H6, 1,4-MeC6H4CHMe2) with NaNH2 in CH3CN gives a dark oil which upon treatment with ROH/NaBPh4 (R = Me, Et) gives the triple bridged complexes (BPh4>.The structure of the benzene complex (R = Me) has been verified by X-ray analysis.The crystals are monoclinic, space group P21/n with a 11.725(4), b 15.573(5), c 18.739(2) Angstroem; beta 103.29(2)deg.These complexes undergo reactions with tertiary phosphines and hydrogen halides.There is also spectroscopic evidence for intermolecular exchange of the bridging alkoxo ligands on mixing pure solutions of the + cations (M = Ru, Os).Reaction of <2> with Pb(SEt) 2 in CH3CN gives the analogous + cations.

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