The mechanism of oxidative addition of Pd(0) to Si–H bonds: electronic effects, reaction mechanism, and hydrosilylation
作者:Michael R. Hurst、Lev N. Zakharov、Amanda K. Cook
DOI:10.1039/d1sc04419b
日期:——
temperature-dependent intramolecular H/Si ligand exchange on the NMR timescale, allowing determination of the energetic barrier to reversible oxidativeaddition. Taken together, these results give unique insight into the individual steps of oxidativeaddition and suggest the initial formation of a σ-complex intermediate to be rate-limiting. The insight gained from these mechanistic studies was applied
distorted-square-planar geometry around the palladium centers, probably due to the steric requirements of the chelating dcpe ligand and the bulky 9-triptycyl group on the silicon or germanium atom. A variable-temperature NMR experiment on the palladium silyl complex 2 indicated that the intramolecular interchange of coordination environments between the silyl and hydrido ligands through an Si–H σ-complex intermediate
The Influence of Silane Steric Bulk on the Formation and Dynamic Behavior of Silyl Palladium Hydrides
作者:Michael R. Hurst、Amanda G. Davis、Amanda K. Cook
DOI:10.1021/acs.organomet.2c00055
日期:2022.4.25
transmetalation reagents, and starting materials in the synthesis of highly valued organosilicon compounds and polymers. Their use in catalysis with palladium is widespread, commonly proposed to proceed via oxidativeaddition of Si–H to Pd(0); however, little is known about this fundamental reaction. Here, we show that the formation of silyl palladium hydride complexes (dcpe)PdH(SiR3), which exist in equilibrium
The Continuum Between Hexagonal Planar and Trigonal Planar Geometries**
作者:Martí Garçon、Andreas Phanopoulos、George A. Sackman、Christopher Richardson、Andrew J. P. White、Richard I. Cooper、Alison J. Edwards、Mark R. Crimmin
DOI:10.1002/anie.202211948
日期:2022.11.2
analysis of a series of heterometallic hydride complexes shows they have subtly different bonding geometries. These compounds can be described as snapshots along a continuum of bonding between trigonal and hexagonal planar geometries.
Reductive Routes to Dinuclear d<sup>10</sup>−d<sup>10</sup> Palladium(0) Complexes and Their Redistribution Equilibria in Solution
作者:Steven M. Reid、Mark J. Fink
DOI:10.1021/om010281z
日期:2001.7.1
The reaction of hydrazine with (dcpe)PdCl2 or (dippe)Pd(OAc)(2) leads to high yields of the isolated dinuclear complexes [(mu -dcpe)Pd](2) and [(mu -dippe)Pd](2), respectively. In solution, these dinuclear complexes undergo a monomer-dimer equilibrium with their corresponding 14-electron (P-P)Pd fragments. Solutions containing both [(mu -dcpe)Pd](2) and [(mu -dippe)Pd](2) give near statistical amounts of the novel "mixed" dimer (mu -dcpe)(mu -dippe)Pd-2.