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Maleckis, Ansis; Kampf, Jeff W; Sanford, Melanie S
Journal of the American Chemical Society, 05/2013, Letnik: 135, Številka: 17Journal Article
This report describes a detailed investigation of acetate-assisted C–H activation at PdIV centers supported by the tris(2-pyridyl)methane (Py3CH) ligand. Mechanistic information about this transformation has been obtained through the following: (i) extensive one- and two-dimensional NMR analysis, (ii) reactivity studies of a series of substituted analogues, and (iii) isotope effect studies. These experiments all suggest that C–H activation at (Py3CH)PdIV(biphenyl)Cl2+ occurs via a multistep process involving chloride-to-acetate ligand exchange followed by conformational and configurational isomerization and then C–H cleavage. The data also suggest that C–H cleavage proceeds via an acetate-assisted mechanism with the carboxylate likely serving as an intramolecular base. The viability of acetate-assisted C–H activation at high valent palladium has important implications for the design and optimization of catalytic processes involving this transformation as a key step.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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