literature-known and novel S-containing pincer-type ligands for ruthenium-catalyzed homogeneous hydrogenation and dehydrogenation reactions was carried out. The scope and limitations of these catalysts were carefully investigated, and it was shown that simple bench-stable SNS–Ru complexes can be used to facilitate the hydrogenation of a variety of different substrates at a maximum H2 pressure of 20 bar under operationally
Pyridine-based SNS-iridium and -rhodium sulfide complexes, including d8–d8 metal–metal interactions in the solid state
作者:Yulie Klerman、Eyal Ben-Ari、Yael Diskin-Posner、Gregory Leitus、Linda J. W. Shimon、Yehoshoa Ben-David、David Milstein
DOI:10.1039/b802223b
日期:——
show differences in the IR stretching frequencies in solution vs. solid states, which are a result of uncommon metal–metal interactionsbetween square planar d8 systems in the solid state. Complexes 1, 3, 5 and 6 were structurally characterized by X-ray crystallography. A network of hydrogen bonds involving the BF4− counter anion and hydrogen atoms of complex 5 was observed.
The synthesis and the reactivity of Pd(0) olefin complexes [Pd(η2-olefin)(SNS)] and [Pd(η2-olefin)(NSN)] containing potentiallyterdentate nitrogen–sulfur ligands were studied. The presence of a potentially coordinating atom in the environment of the metal, influences strongly the fluxional behavior in solution but not the overall reactivity with respect to olefin exchange and thermodynamic stability
Attack of Substituted Alkynes on Olefin Palladium(0) Derivatives of Pyridylthioethers. The First Kinetic Study on the Mechanism of Formation of Palladacyclopentadiene Complexes
The formation of metallacyclopentadienyl derivatives was studied under controlled conditions, and the kinetics and mechanism of reactions between pyridylthioether olefin Pd(0) substrates and substituted alkynes of the type ZC⋮CZ (Z = COOMe, COOEt, COOt-Bu) leading to the corresponding palladacyclopentadienyl species were systematically investigated. In the case of less hindered ancillary ligands the
Pyridine-2,6-bis(thioether) (SNS) Complexes of Ruthenium as Catalysts for Transfer Hydrogenation
作者:Michael J. Page、Jörg Wagler、Barbara A. Messerle
DOI:10.1021/om1005319
日期:2010.9.13
6-bis(tert-butylthiomethyl)pyridine (SNStBu) to Ru(PPh3)3Cl2 and Ru(MeCN)4Cl2 led to the isolation of the complexes Ru(SNStBu)Cl2(PPh3) (1) and Ru(SNStBu)Cl2(MeCN) (4), respectively. Substitution of one chloride ligand from 1 and 4 with acetonitrile proved facile via salt metathesis with NaBPh4 to yield [Ru(SNStBu)Cl(MeCN)(PPh3)]BPh4 (2) and [Ru(SNStBu)Cl(MeCN)2]BPh4 (5). Reaction of 1 with an excess of AgBF4 in acetonitrile