<i>cis</i>-Specific Hydrofluorination of Alkenylarenes under Palladium Catalysis through an Ionic Pathway
作者:Enrico Emer、Lukas Pfeifer、John M. Brown、Véronique Gouverneur
DOI:10.1002/anie.201310056
日期:2014.4.14
paper describes the hydrofluorination of alkenes through sequential H− and F+ addition underpalladiumcatalysis. The reaction is cis specific, thus providing access to benzylic fluorides. The mechanism of this reaction involves an ionicpathway and is distinct from known hydrofluorinations involving radical intermediates. The first catalytic enantioselective hydrofluorination is also disclosed.
Molecular Architecture <i>via</i> Coordination: Self-Assembly, Characterization, and Host−Guest Chemistry of Mixed, Neutral-Charged, Pt−Pt and Pt−Pd Macrocyclic Tetranuclear Complexes. X-ray Crystal Structure of Cyclobis[[<i>cis</i>- Pt(dppp)(4-ethynylpyridine)<sub>2</sub>][<i>cis</i>-Pd<sup>2+</sup>(PEt<sub>3</sub>)<sub>2</sub>2<sup>-</sup>OSO<sub>2</sub>CF<sub>3</sub>]]
作者:Jeffery A. Whiteford、Cuong V. Lu、Peter J. Stang
DOI:10.1021/ja9635286
日期:1997.3.1
cis-ML2(OSO2CF3)2 (M = Pt or Pd; L = PEt3 or L2 = dppp), in CH2Cl2 or acetone, at room temperature, results in mixed, neutral-charged cyclic tetranuclear, Pt−Pt or Pt−Pd macrocyclic complexes in 90−99% yields via self-assembly. All tetramers are microcrystalline air- and water-stable solids with decomposition points > 170 °C. The benzonitrile based macrocycles can be disassembled in solution with 4,4‘-bipyridine
Substitution reactions of (diphosphine)palladium(II) and -platinum(II) chloride and triflate complexes
作者:Diane L. Oliver、Gordon K. Anderson
DOI:10.1016/s0277-5387(00)83533-0
日期:1992.1
Abstract The triflate complexes [Pd(OTf)2L2] (L2 = dppm, dppe, dppp) and [Pt(OTf)2(dppp)] are prepared by reaction of the corresponding chloride with methyl triflate. The chloropalladium complexes [PdCl2L2] do not react with PPh3, but with PBu3 substitution of one chloride takes place, whereas [PtCl2(dppp)] reacts with either PPh3 or PBu3. The triflate complexes [M(OTf)2L2] (M = Pd, Pt; L2 = dppm,
coordination to cis-protected C2-symmetric palladium(II) or unprotected tetravalent palladium(II) ions, respectively. The trigonal-bipyramidal complex was characterized by NMR and UV–vis spectroscopy, electrospray ionization mass spectrometry (ESI-MS), and single-crystal X-ray diffraction. The cubic structure was characterized by NMR and UV–vis spectroscopy and ESI-MS.
solid-state characterization of nanoscalecoordinationcages formed by tetradentate cavitand ligands and appropriate metal precursors. The preorganization of the cavitand ligand in terms of structural rigidity and relative orientation of the pyridyl units leads to the exclusive formation of coordinationcages in a wide temperature and concentration range. Desired features of the cage self-assembly process,