Addition copolymerization of norbornene lactone catalyzed by Pd complexes

2021 ◽  
Author(s):  
Kosuke Isaji ◽  
Shin‐ichi Matsuoka ◽  
Masato Suzuki
Keyword(s):  
Pd Complexes

Asymetrical Dimer - allyl-palladiu Complexes II. Data from Infrared Spectra and Chemical Behaviour

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Maria Maganu ◽  
Filip Chiraleu ◽  
Constantin Draghici ◽  
Gheorghe Mihai
Keyword(s):  
Carbon Monoxide ◽  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Infrared Spectra ◽  
Analytical Methods ◽  
1H Nmr Spectroscopy ◽  
Chemical Behaviour ◽  
The Asymmetry ◽  
Pd Complexes

The previous data obtained by 1H-NMR spectroscopy established the existence of an asymmetry of the bond between Pd and p-allylic groups, even in the p-allyl-Pd complexes dimers which are considered usually symmetric dimers. The asymmetry of the bond depends by the substitutes of the allylic group. Other analytical methods were investigated for additional proof of the obtained results. Thus, this paper discusses how this asymmetry would be reflected in the infrared spectra and in the reaction of the complexes with carbon monoxide.

Pd complexes containing non-symmetrical diphosphines in the terpolymerization of ethene, propene and carbon monoxide

2007 ◽  
Vol 265 (1-2) ◽  
pp. 98-108 ◽  
Author(s):  
Antonella Leone ◽  
Sebastian Gischig ◽  
Giambattista Consiglio
Keyword(s):  
Carbon Monoxide ◽  
Pd Complexes

Zirconium-catalyzed alkene cycloalumination for the synthesis of substituted phosphines and their transition metal (Mo, Pd) complexes

2016 ◽  
Vol 824 ◽  
pp. 73-79
Author(s):  
Leisan К. Dil'mukhametova ◽  
Vladimir А. D'yakonov ◽  
Тat'yana V. Tyumkina ◽  
Usein М. Dzhemilev
Keyword(s):  
Transition Metal ◽  
Pd Complexes

scholarly journals Crystal and molecular structure and 31P and 195Pt nmr spectroscopy of [Pt3S2(PMe2Ph)6][BEt4]2; a trinuclear complex containing triply-bridging sulphide ligands

1984 ◽  
Vol 62 (4) ◽  
pp. 696-702 ◽  
Author(s):  
Gordon William Bushnell ◽  
Keith Roger Dixon ◽  
Reiko Ono ◽  
Alan Pidcock
Keyword(s):  
Trinuclear Complex ◽  
Complete Analysis ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Interactions ◽  
Nuclear Magnetic Resonance Spectra ◽  
Square Planar ◽  
Metal Metal ◽  
Pd Complexes

An X-ray diffraction study of [Pt3S2(PMe2Ph)6][BEt4]2 shows that it crystallises in the monoclinic space group, C2/c, with a = 15.447(2), b = 18.033(3), c = 26.505(5) Å, β = 96.73(2)°. The cation consists of three, distorted, square-planar cis-PtS2(PMe2Ph)2 moieties combined by sharing of the two sulphur atoms to produce a central Pt3S2 unit with C2 symmetry and Pt—Pt distances of 3.182(1) Å (one edge) and 3.108(1) Å (two edges). Complete analysis and computer simulation of 31P{1H} and 195Pt{1H} nuclear magnetic resonance spectra give values for 1J(Pt—P), 3202 Hz; 3J(Pt—P), −25 Hz; and 2J(Pt—Pt), 476 Hz. The structure is compared with previous results for analogous Ni and Pd complexes and the structural and nmr parameters are discussed with reference to the possibility of metal–metal interactions.

scholarly journals Synthesis of Pd Complexes Containing Tailed NHC Ligands and Their Use in a Semicontinuous Membrane-Assisted Suzuki Cross-Coupling Process

2018 ◽  
Vol 22 (11) ◽  
pp. 1509-1517 ◽  
Author(s):  
Dominic Ormerod ◽  
Matthieu Dorbec ◽  
Eugen Merkul ◽  
Nadya Kaval ◽  
Nicolas Lefèvre ◽  
...  
Keyword(s):  
Cross Coupling ◽  
Coupling Process ◽  
Pd Complexes

Catalysis with a Skip: Dynamically Coupled Addition, Proton Transfer, and Elimination During Au- and Pd-Catalyzed Diol Cyclization

2021 ◽  
Author(s):  
Matthew Teynor ◽  
Windsor Scott ◽  
Daniel Ess
Keyword(s):  
Potential Energy ◽  
Proton Transfer ◽  
Energy Landscape ◽  
Cyclization Reactions ◽  
Potential Energy Landscape ◽  
Water Elimination ◽  
Catalytic Intermediates ◽  
Pd Complexes ◽  
Dynamics Simulations ◽  
Step Mechanism

Au and Pd complexes have emerged as highly effective π-bond cyclization catalysts to construct heterocycles. These cyclization reactions are generally proposed to proceed through multi-step addition-elimination mechanisms involving Au- or Pd-alkyl intermediates. For Au- and Pd-catalyzed allylic diol cyclization, while the DFT potential energy surface landscapes show a stepwise sequence of alkoxylation π-addition, proton transfer, and water elimination, quasiclassical direct dynamics simulations reveal new dynamical mechanisms that depend on the metal center. For Au, trajectories reveal that after π-addition the Au-alkyl intermediate is always skipped because addition is dynamically coupled with proton transfer and water elimination. In contrast, for Pd catalysis, due to differences in the potential-energy landscape shape, only about half of trajectories show Pd-alkyl intermediate skipping. The other half of the trajectories show the traditional two-step mechanism with the intervening Pd-alkyl intermediate. Overall, this work reveals that interpretation of a DFT potential-energy landscape can be insufficient to understand catalytic intermediates and mechanisms and that atomic momenta through dynamics simulations is needed to determine if an intermediate is genuinely part of a catalytic cycle.<br>

Highly efficient palladium-catalysed carbon dioxide hydrosilylation employing PMP ligands

2019 ◽  
Vol 48 (3) ◽  
pp. 1017-1022 ◽  
Author(s):  
Patrick Steinhoff ◽  
Melanie Paul ◽  
Julian P. Schroers ◽  
Michael E. Tauchert
Keyword(s):  
Carbon Dioxide ◽  
Highly Efficient ◽  
Excellent Activity ◽  
Pd Complexes

A series of zero-valent Pd complexes featuring PMP ligands (M = LiI, CuI, ZnII) is reported. An excellent activity in chemoselective CO2 hydrosilylation producing silyl formate is observed (TOF1/2 = 3000 h−1).

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