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• W2036649184 abstract "The stable ionic PdII complexes 1A–4A were synthesized through the complexation of PdCl2(MeCN)2 with the phosphane-functionalized ionic liquids (FILs) 1–4 with π-acceptor character. Single-crystal X-ray diffraction analyses showed that 1A–4A were all composed of PdII-centred square-planar cations and triflate (OTf–, CF3SO3–) counteranions. The complex cations in 1A–3A possessed structural similarity to trans-PdCl2(PPh3)2. The cation in 4A was a new PdII-centered planar complex ligated by the phosphane–carbon anion–carbene (PCC) pincer in a tripodal manner. The stabilities of 1A–4A were improved due to the intensive π-backbonding interaction between the Pd and P atoms. When complexes 1A–4A were used as precatalysts for homogeneous carbonylative Sonogashira coupling of PhI with phenylacetylene free of CuI, 1A–3A exhibited excellent catalytic behaviour with a TON of up to 1700 at a CO pressure of 0.5 MPa and moderate temperature of 100 °C, whereas 4A exhibited poor activity towards the transformation of PhI due to the high stability of 4A. The recycling experiments of 3A in [Bpy]BF4 (as a solvent) indicated that 3A could be recycled for 5 runs with neither activity loss nor metal leaching into the organic phase. Complex 3A also proved to be a general precatalyst for the carbonylative Sonogashira couplings of a wide range of aryl iodides with phenylacetylene. The selectivity of the desired carbonylation product depended more on electronic effects than the steric effects of the substituents of the aryl iodides." @default.
• W2036649184 created "2016-06-24" @default.
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• W2036649184 date "2014-01-21" @default.
• W2036649184 modified "2023-10-16" @default.
• W2036649184 title "Phosphane‐Ligated Ionic Palladium Complexes: Synthesis, Characterization and Application as Efficient and Reusable Precatalysts for the Homogeneous Carbonylative Sonogashira Reaction under CuI‐Free Conditions" @default.
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• W2036649184 doi "https://doi.org/10.1002/ejic.201301318" @default.
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