1,721,026 research outputs found
Nucleophilic substitution on a Ru-coordinated Cp ring by a carborane anion
No full textThe Cp ring in [RuCl(Cp)(PPh3)(2)] undergoes an apparent nucleophilic attack by the carbanion carb (Hcarb = 2-Me-1,2-dicarba-closo-dodecaborane), to give an H-/carb(-) exchange process, which is favoured by coordination of the hydride to the ruthenium centre
Enantiomeric discrimination in coordination of sulfoxides to platinum(II): X-ray structure of the kinetically over thermodynamically favoured erythro cis-dichloro-bis(methyl-p-tolylsulfoxide)platinum(II)
No full textA Seven-Membered Platinum-Amino-Amidine Metallacycle. X-ray Structure of cis-[Pt(NH=CPhNButCH2CH2NHBut)Cl2]. ́Me2CO
No full textSynthesis and crystal structure of (η-C5H5)NiRu3(CO)6(C6H9). A new complex obtained by insertion of a nickel atom into a Ru3 cluster
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Platinum(II) Complexes with Monocoordinated 2,9-Dimethyl-1,10-phenanthroline and Phosphine Ligands. Exchange of the Donor Nitrogen and Rotation about the Pt-P and P-C Bonds Studies by NMR Spectroscopy: Arene Stacking as an Intramolecular Brake
No full textOlefin Trifluoroacetato Derivatives of Copper(I) and Their Olefin/CO Exchange Reaction
No full textCompounds of general formula Cu(CF3COO)(olefin) (olefin = cyclooctene (coe), 1,5-cyclooctadiene (cod), diethylfumarate (defu), methylcinnamate (meci)) have been prepared and the molecular structures have been solved by X-ray diffraction in the case of olefin = coe, defu, meci. The complexes are characterized by a dimeric [Cu2(ƒÝƒ{CF3CO2)2(olefin)2] core with bridging trifluoroacetates and a ƒØ2-bonded olefin. In the case of the defu and meci complexes, [Cu2(ƒÝƒ{CF3CO2)2(olefin)2] dimeric units are linked by the oxygen atom of a carbonyl group of the ester to give polymeric chains. The compound [Cu2(ƒÝƒ{CF3COO)2(meci)2]n is the first structurally characterized example of a metal-bonded methylcinnamate. By recrystallization of [Cu2(CF3COO)2(cod)2], a derivative featuring a cod / Cu molar ratio of 0.5 has been isolated and structurally characterized as [Cu2(ƒÝ-CF3COO)2(ƒÝ-cod)]n, which represents the first example of a polymeric metal complex containing a bridging cod ligand. The carbo..
Rhodium(I), palladium(II), and platinum(II) complexes containing new mixed phosphane-phosphite ligands - Effect of the catalytic system stability on the enantioselective hydroformylation of styrene
No full textThe new mixed phosphane-phosphite ligands 1 and 2, derived from 3,3′-di-tert-butyl-2,2′-dihydroxy-5,5′-dimethoxybiphenyl and (S)-binaphthol, respectively, reacted with [Rh(COD)(THF)2]CF3SO3 to give the compounds [Rh(COD)(1)]CF3SO3 and [Rh(COD)(2)]CF3SO3 in which the ligands 1 and (S)-2 are chelated to the rhodium centre. The reaction with [Rh(CO)2Cl]2 gave two different products, [Rh(CO)2(L)Cl] and [Rh(CO)(L)Cl] [L = 1 and (S)-2], containing L as a chelate. On the basis of the IR and NMR spectroscopic data, the proposed structure of the pentacoordinate species is a trigonal bipyramide in which the phosphane-phosphite ligand assumes an equatorial-axial coordination. The reactions of 1 and 2 with [Pd(C6H5CN)2Cl2] and [Pt(COD)I2] gave the corresponding compounds [Pd(L)Cl2] and [Pt(L)I2] in which the ligands are chelated to the metal centre. The crystal structure of the chloroform solvate of [Pd(L)Cl2] was fully characterised by an X-ray study. The chiral ligands (S)-2 and (S)-3 [derived from the orthobis(trimethylsilyl)-substituted (S)-binaphthol] were tested in the hydroformylation of styrene. The results obtained were discussed in light of the catalytic system stability
Synthesis, Characterization and Olefin/CO Exchange Reactions of Copper(I) Derivatives Containing Bidentate Oxygen Ligands
No full textNew hexafluoroacetyalacetonato- (hfacac) and trifluoroacetato olefin complexes of copper(I) of the general formula Cu(hfacac)(olefin) and Cu(CF3CO2)(olefin) have been prepared from Cu2O / hfacacH / olefin or Cu(CF3CO2)(toluene)0.5 / olefin systems. The structures of [Cu(hfacac)(coe)], [Cu(hfacac)(van)], [Cu(μ-CF3COO)(tbve)]n and [Cu(μ-CF3COO)(van)]2•C7H8, have been determined by X-ray diffraction methods, where coe = cyclooctene , van = 4-vinylanisole and tbve = t-butylvinylether. In the solid state, the 4-vinylanisole / trifluoroacetate complex, [Cu(CF3COO)(van)]2, is dimeric with two carboxylato groups symmetrically bridging two copper atoms, while the t-butylvinylether derivative, [Cu(μ-CF3COO)(tbve)]n, is polymeric with single [CF3COO]− bridges between adjacent copper atoms. Olefin hfacac complexes are monomeric and considering the two oxygen atoms and the midpoint of the double bond of the coordinated olefin, the copper atom lies in a nearly trigonal..
(η6-Arene) ruthenium(II) complexes containing enantiomerically pure (β-aminoalkyl) phosphines or a (β-aminoalkyl) phosphinite:: synthesis, stereochemical and kinetic studies (pg 3149, 2000)
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