Showing papers in "Organometallics in 2011"

TL;DR: This personal account summarizes the work, beginning with the discovery of the first stable carbene in 1988 up until the recent isolation of mesoionic carbenes, showing that these stable species are not limited to the role of ligand for transition metals, but that they are also powerful agents for the activation of small molecules, and for the stabilization of highly reactive diamagnetic and paramagnetic species.

TL;DR: In this paper, the authors describe recent progress in the synthesis and structural characterization of isolable N-heterocyclic silylenes and their fascinating reactivities with respect to an emergent topic in main-group chemistry: metal-free small-molecule activation.

TL;DR: The PNP-ligated iridium(III) trihydride complex as mentioned in this paper exhibited the highest catalytic activity for hydrogenation of carbon dioxide in aqueous KOH, and the results nicely explain the experimental observations that the catalytic cycle is dependent on both the strength of the base and hydrogen pressure.

TL;DR: A series of pincer-type complexes of Os and Ru have been synthesized and investigated in catalytic alcohol dehydrogenation as mentioned in this paper for primary alcohols for reactions of transfer hydrogenation, dehydrogenative coupling, and amine alkylation.

TL;DR: A series of RuII(η6-arene) complexes with 1,2,3-triazolylidene ligands have been prepared and fully characterized in this paper.

TL;DR: In this paper, electron-rich PNP-and PNN-type ruthenium(II) hydrido borohydride pincer complexes, [RuH(BH4)(tBu-PNP)] (tBu)-PNP = (2,6-bis(di-tert-butylphosphinomethyl)pyridine) (5) and [RuBH 4)(t Bu-PNN)] (TbH4), were prepared from their corresponding N2-bridged dinuclear Ru(II

TL;DR: In this article, the reaction of a β-diketiminato n-butylmagnesium complex with pinacol-borane in the presence of pyridine derivatives provides facile access to borylated dihydropyridines.

TL;DR: A series of 2,6-dibenzhydryl-N-(2-phenyliminoacenaphthylenylidene)-4-methylbenzenamines (L1−L5) and the nickel(II) dibromide complexes thereof (C1−C5) were synthesized and fully characterized.

TL;DR: In this article, the pincer ruthenium complexes based on the new bipyridine-NHC ligand 1 were prepared and studied, resulting in an efficient catalytic hydrogenation of esters to the corresponding alcohols under mild conditions.

TL;DR: A series of ruthenium complexes can perform acceptorless dehydrogenation of diols as well as the reaction of amines and alcohols to form ester, lactam, and amide products.

TL;DR: In this paper, the authors provide examples of particularly innovative results that may serve as a springboard for future developments, such as antimetastatic drugs, kinase inhibitors, and antiproliferative agents with redox activity.

TL;DR: Experimental and computational results confirm that these N,N-diarylated mesoionic carbenes exhibit enhanced stability in comparison to their alkylated counterparts, which allows for the preparation of ruthenium olefin metathesis catalysts that are efficient in both ring-opening and ring-closing reactions.

TL;DR: In this paper, the synthesis of cylinder-type carbene complexes from polycarbene ligands and coinage metal ions via metal-controlled self-assembly has been explored, and two equivalents of tetraimidazolium salt H4-2a,b(Br)4 or H4 -2a-b(PF6)4 reacts with four equivalents of Ag2O to yield molecular cylinders of type [Ag4(2a)2]Y4 (Y− = [AgBr2]− and/or Br−) or [Ag

TL;DR: In this paper, four new Pd(II) complexes containing sulfonate-functionalized N-heterocyclic carbene ligands have been synthesized, in which the ligands adopt a monodentate, bis-chelating, and pincer coordination form.

TL;DR: In this paper, resorcinol-derived bis(phosphinite) ligands 1,3-(R2PO)2C6H4 (R = iPr and Ph) with Fe(PMe3)4 furnishes iron POCOP-pincer hydride complexes with two PMe3cis to each other.

TL;DR: In this article, the pincer complex Ru(II)-PNN (PNN = 2-(di-tert-butylphosphinomethyl)-6-diethylaminomethsyl)pyridine) catalytic cycle was investigated to investigate the mechanism of the reactions of amines with primary alcohols to produce amides.

TL;DR: In this paper, the authors reviewed several examples taken from recent work, such as: the "hydrogen borrowing" amine alkylation by alcohols; the dehydrogenative coupling of amine and alcohol to give amide; Ru complexes as solar cell photosensitizers; Ir organometallics as water oxidation catalyst precursors and as OLED emitters; and recent hydrogen storage strategies involving catalytic dehydrogenation of ammonia-borane and of organic heterocycles.

TL;DR: In this paper, a ligand 6,6′-dihydroxy-2,2′-bipyridyl (dhbp) was synthesized via its tautomer, and this provided an efficient route to novel metal complexes of dhbp.

TL;DR: In this article, a mesoionic N-heterocyclic carbene (NHC) consisting of 1,4-diphenyl-3-methyl-1,2,3-triazol-5-ylidene (Tz) was used as a catalyst for the stereoselective hydroarylation of alkynes.

TL;DR: A series of neutral and cationic rhodium and iridium(I) complexes based on hemilabile O-donor-and Ndonorfunctionalized NHC ligands having methoxy, dimethylamino, and pyridine as donor functions have been synthesized.

TL;DR: In this article, a cyclometalated [Cp*IrIII(2-pyridyl-2′-2-phenyl)Cl] precatalyst has been characterized by EPR spectroscopy and has a rhombic symmetry.

TL;DR: New paramagnetic Ni(I)(IMes)(2)X (IMes: 1,3-bis-(2,4,6-trimethylphenyl)-imidazol-2-ylidene) and Ni(II)(tmiy)(2)(X)(Ar) were formed from the oxidative addition of aryl halides to Ni bound by a sterically-less hindered NHC ligand, tmiy.

TL;DR: An effective model of cooperative effect of silver for the copper-catalyzed trifluoromethylation of activated and unactivated aryl iodides to trifluromethymethylated arenes using Me3SiCF3 was achieved with a broad substrate scope as mentioned in this paper.

TL;DR: In this paper, the synthesis and characterization of a series of (N-heterocyclic carbene)PdCl2(TEA) (TEA = triethylamine) complexes are presented.

TL;DR: In this paper, the yttrium complex was characterized by X-ray diffraction analysis as a solvent-free monomer, in which the carbazolide ligand coordinates to the y3+ ion in a κP:κN:κP′-tridentate mode and the two aminobenzyl groups coordinate to the Y3+, ion in η1C:κ N-bidentate modes.

TL;DR: In this article, N3-alkylated 1,2,3-triazolium salts with Pd(OAc)2 afforded a μ2−I2 bridged bimetallic complex [Pd(trz)I2]2 and monometallic bis(carbene) complexes Pd[trz]2I2 as a mixture of trans and cis isomers.

TL;DR: An easy and direct access to POP-type osmium(II) and Osmium (IV) complexes, including OsH4{dbf(PiPr2)2} (dbf[PiPr 2] = 4,6-bis(diisopropylphosphine)dibenzofuran), is reported in this article.

TL;DR: In this paper, the authors employ correlated and highly polarized basis levels and natural bond orbital techniques to analyze the anomalous structural and basicity properties of inorganic Si-O-Si linkages compared to organic C−O-C congeners, and find that vicinal hyperconjugative interactions of nO → σ*XH type are primarily responsible for promoting the increased torsional flexibility and reduced basicity of disiloxanes from ethers.

TL;DR: In this article, the carboxyl and nitro groups in commercially available 3-nitrobenzoic acid were converted to chiral imidazoline and amine, respectively.

TL;DR: Organometallic IrIII cyclopentadienyl complexes as discussed by the authors have been shown to be stable in the presence of tetramethyl(phenyl)cystals and 2-phenylquinoline.