• ligand
  • The synthesis and characterisation of the bis(diphenylphosphino )-ethylamine, Ph2PN(Et)PPh2, ligand and its subsequent reactions with various palladium precursors is described in Chapter 2. (ukzn.ac.za)
  • when the same reaction was carried-out in the presence of the Pd(0) species [Pd2(dba)(dba = dibenzylideneacetone) the dinuclear ligand-bridged complex [Pd2C12 {u-Ph2PN(Et)PPh2}was formed. (ukzn.ac.za)
  • Direct reaction of the ligand with [Pd2(dba)afforded, in the first instance, [Pd2{u-Ph2PN(Et)PPh2}5, an extremely air-sensitive red compound, that readily reacted with oxygen in the solution to afford palladium metal and a yellow clathrate species that contained the oxidised ligand i.e. (ukzn.ac.za)
  • In the case of the dinuclear ligand-bridged complex 2, this is achieved through formation of a Pd-Pd bond of length 2.600(1)A. Of particular interest is the crystal structure of the clathrate, which has the oxidised ligand and dba molecules stacked in alternating lines approximately parallel to the [c ]-axis of the unit cell. (ukzn.ac.za)
  • The synthesis and characterisation of the bis(2-pyridyl)phenylphosphine, PhP(py)2 ligand and its subsequent reaction with [PdCI2(PhCN)to afford the mononuclear complex cis-[PdCI2{n1-PhP(py)2}6 is decribed in Chapter 3. (ukzn.ac.za)
  • The square-planar coordination at each palladium atom in 7 is achieved through the formation of a Pd-Pd bond of length 2.586(1)A. The synthesis and characterisation of the 2,5-(diphenylphosphino)thiophene, Ph2P(C4H2S)PPh2 ligand is described in Chapter 4. (ukzn.ac.za)
  • A catalyst system comprising palladium acetate and bidentate bis(diphenylphosphino)alkane ligand of general formula Ph 2 P(CH 2 ) n PPh 2 ( n = 3-5) was highly active in N,N′-diphenylurea synthesis from nitrobenzene, aniline and carbon monoxide and showed different reactivity from the system with the more common monodentate triphenylphosphine ligand. (springer.com)
  • However, in identical conditions, the [Pd(Ph 2 PNHC 6 H 4 PPh 2 )Cl 2 ] complex, where the P , N -ligand has been replaced by a related bidentate P -donor one, shows a significantly lesser performance. (springer.com)
  • The synthesis of Pd-NHC complexes can also be achieved through substitution of a labile ligand L in a Pd-L complex. (wikipedia.org)
  • The PdIV complexes feature the tripodal tris(pyrazol-1-yl)borate (Tp) ligand as well as two Pd-C(sp3) bonds and the oxidant generates a new Pd-C(sp2) bond. (ku.edu)
  • Detailed 1H NMR spectroscopic studies at low temperature provided the evidence of the formation for the (Tp)PdII intermediate via ligand exchange and the formation of the desired PdIV complexes in solution. (ku.edu)
  • These PdIV complexes, which also possess the stabilizing tripodal Tp ligand, are generated in the presence of iodonium salts. (ku.edu)
  • Diphenyl-2-pyridylphosphine is a sought after ligand for its ability to relay protons to transition metals such as palladium(II) in homogeneous catalysis. (wikipedia.org)
  • JohnPhos is particularly an effective ligand for the palladium-catalyzed amination of aryl chlorides, bromides, and triflates. (wikipedia.org)
  • catalyst
  • In the palladium-catalyzed cyclization of allenic allylic esters using Pd(dba) 2 as catalyst, it was shown that the allene acts as a carbon nucleophile. (diva-portal.org)
  • Potential reusability of magnetically separable palladium catalyst and performing the reactions at environmentally conditions are notable features of the present methods making great potential for practical applications. (springer.com)
  • Ghorbani-Choghamarani A, Tahmasbi B, Moradi P (2016) Palladium- S -propyl-2-aminobenzothioate immobilized on Fe 3 O 4 magnetic nanoparticles as catalyst for Suzuki and Heck reactions in water or poly (ethylene glycol). (springer.com)
  • Catalyst regeneration, Et3Al was added to do transmetallation with palladium. (wikipedia.org)
  • stable
  • A stable PdIV complex was isolated, characterized and shown to mediate the formation of a heterocycle. (ku.edu)
  • clarification needed] Palladium films with defects produced by alpha particle bombardment at low temperature exhibit superconductivity having Tc=3.2 K. Naturally occurring palladium is composed of seven isotopes, six of which are stable. (wikipedia.org)
  • synthesis
  • The synthesis of Pd-NHC complexes follow the methods used for the synthesis of transition metal NHC complexes. (wikipedia.org)
  • In this Dissertation, the synthesis of various PdIV complexes and studies aimed at explaining the range of fundamental transformations at the PdIV-center beyond reductive elimination are presented. (ku.edu)
  • This introduction also documents the observed and the proposed advantages of Palladium(IV) complexes in the applications to organic synthesis. (ku.edu)
  • chemistry
  • Chapter One discusses a general introduction into Palladium(IV) chemistry which includes a comparison between Pd0-PdII and PdII-PdIV catalytic cycles. (ku.edu)
  • Heck
  • Complexes 1-6 catalyzed the Heck coupling reactions of iodobenzene and butylacrylate. (scielo.org.za)
  • The use of Pd-NHC complexes in Heck-Mizoroki cross-coupling permits the use of cheaper, ample supplies of aryl chloride substrates. (wikipedia.org)
  • Kantam ML, Srinivas P, Yadav J, Likhar PR, Bhargava S (2009) Trifunctional N,N,O -terdentate amido/pyridyl carboxylate ligated Pd(II) complexes for Heck and Suzuki reactions. (springer.com)
  • atoms
  • Structural studies suggest electronic effects within the complexes to be strongly affected by steric interactions between the hydrogen atoms of the o -xylyl bridges and the benzimidazole components and their substituents. (rsc.org)
  • Regioselectivity is controlled by variety of steric and electronic factors the most important of which being a form of trans effect, in which atoms complexed trans to the P‑atom become more electrophilic than ones located trans to the N‑atom. (wikipedia.org)
  • platinum
  • More than half the supply of palladium and its congener platinum is used in catalytic converters, which convert as much as 90% of the harmful gases in automobile exhaust (hydrocarbons, carbon monoxide, and nitrogen dioxide) into less noxious substances (nitrogen, carbon dioxide and water vapor). (wikipedia.org)
  • Palladium is a soft silver-white metal that resembles platinum. (wikipedia.org)
  • Hydrogenation
  • In order to form complexes that will catalyze the hydrogenation of unsaturated hydro-carbons in a system consisting of (Ph 3 P) 2 Pd 2 , HOAc, and H 2 , the presence of oxygen is necessary. (springer.com)
  • allylic
  • Their complexes are particularly effective at generating single enatiomers in reactions involving highly symmetric transition states, such as allylic substitutions, which are typically difficult to perform stereoselectively. (wikipedia.org)
  • borate
  • Overall two-electron oxidative addition of the aryldiazonium cation para -methoxybenzenediazonium (pmbd + ) to [(Tp*)Pd II Me 2 ] − (Tp* − = hydridotris-(3,5-dimethylpyrazolyl)borate) produces the first characterized palladium( IV ) aryldiazenido complex, [(Tp*)Pd IV Me 2 (pmbd)] (pmbd − = para -methoxybenzenediazenido). (rsc.org)
  • Negishi
  • The use of NHC-Pd-PEPPSI complexes in Negishi cross-coupling has resulted in high turnover numbers and turnover frequencies. (wikipedia.org)
  • However, studies of Pd-NHC complexes and their utility in Negishi coupling are currently lacking despite these promising results. (wikipedia.org)
  • dissolves
  • Palladium dissolves slowly in concentrated nitric acid, in hot, concentrated sulfuric acid, and when finely ground, in hydrochloric acid. (wikipedia.org)
  • derivative
  • This chapter contains a tabular compilation of nuclear magnetic resonance data and UV-visible spectral data of palladium complex of porphyrin derivative C 84 H 44 N 4 Pd. (springer.com)
  • metal
  • Homoleptic metal halide complexes are known with several stoichiometries, but the main ones are the hexahalometallates and the tetrahalometallates. (wikipedia.org)
  • hydrogen
  • Palladium is an attractive material for hydrogen and hydrogen-isotope storage applications due to its properties of large storage density and high diffusion of lattice hydrogen. (osti.gov)
  • Using recently developed inter-atomic potentials for the palladium-silver-hydrogen system, we perform large-scale atomistic simulations to examine the defect-mediated mechanisms that govern helium bubble growth. (osti.gov)
  • high
  • Due to a smaller crystal field splitting energy, the halide complexes of the first transition series are all high spin when possible. (wikipedia.org)
  • cross-coupling
  • As in other Pd-NHC mediated cross-coupling reactions, the use of Pd-NHC complexes also allow higher turnover numbers than their NHC-free counterparts. (wikipedia.org)