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- W2895055807 abstract "A well-established oxidative addition of organic halides (R-X) to N-heterocyclic carbene (NHC) complexes of palladium(0) leads to formation of (NHC)(R)PdII (X)L species, the key intermediates in a large variety of synthetically useful cross-coupling reactions. Typical consideration of the cross-coupling catalytic cycle is based on the assumption of intrinsic stability of these species, where the subsequent steps involve coordination of the second reacting partner. Thus, high stability of the intermediate (NHC)(R)PdII (X)L species is usually taken for granted. In the present study it is discussed that such intermediates are prone to non-classical R-NHC intramolecular coupling process (R = Me, Ph, Vinyl, Ethynyl) that results in removal of NHC ligand and generation of another type of Pd catalytic system. DFT calculations (BP86, TPSS, PBE1PBE, B3LYP, M06, wB97X-D) clearly show that outcome of R-NHC coupling process is not only determined by chemical nature of the organic substituent R, but also strongly depends on the type of solvent. The reaction is most favorable in polar solvents, whereas the non-polar solvents render the products less stable. © 2019 Wiley Periodicals, Inc." @default.
- W2895055807 created "2018-10-12" @default.
- W2895055807 creator A5029774717 @default.
- W2895055807 creator A5053135866 @default.
- W2895055807 date "2018-10-03" @default.
- W2895055807 modified "2023-10-16" @default.
- W2895055807 title "Switching the nature of catalytic centers in Pd/NHC systems by solvent effect driven non-classical R-NHC Coupling" @default.
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- W2895055807 doi "https://doi.org/10.1002/jcc.25572" @default.
- W2895055807 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30284292" @default.
- W2895055807 hasPublicationYear "2018" @default.
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