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• W4383345805 endingPage "121676" @default.
• W4383345805 startingPage "121676" @default.
• W4383345805 abstract "Seven unsymmetrical imidazolium chlorides featuring a mesityl (Mes) or 2,6-diisopropylphenyl substituent (Dip) on one of their nitrogen atoms and a cycloalkyl group of variable size (cyclopentyl, cyclohexyl, 1-adamantanyl, cycloheptyl, cyclooctyl, or cyclododecyl) on the other one served to prepare a small library of novel palladium PEPPSI complexes with the generic formula [PdCl2(NHC)(Py)]. Three symmetrical compounds featuring the bulky yet flexible 1,3-dicyclododecylimidazol-2-ylidene and the archetypical IMes and IDip ligands were also synthesized. All the products were isolated in modest to satisfactory yields (15–85%) and fully characterized using 1H and 13C NMR spectroscopies. The molecular structures of five of them were determined using single crystal X-ray diffraction analysis, which revealed that, in most cases, the conformational freedom of the N-cycloalkyl moieties subsisted in the crystal phase. Topographic maps and %VBur parameters were computed to quantify the steric requirements of the uNHC ligands. The catalytic activity of the ten complexes was assessed in the Suzuki–Miyaura cross-coupling of phenylboronic acid and aryl halides. The reactions required only a low catalyst loading (0.05–0.25 mol%) and were carried out under mild aerobic conditions in a green, water-based solvent mixture. High yields of biphenyl derivatives were achieved with all the aryl bromides tested, irrespective of the presence of electron-donating or withdrawing substituents on their aromatic ring. When 4-chloro-acetophenone, a representative electron-poor aryl chloride served as substrate, all the complexes featuring cycloalkyl substituents on their NHC ligand became mostly inactive, whereas the IMes and IDip-based catalyst precursors maintained a high activity." @default.
• W4383345805 created "2023-07-07" @default.
• W4383345805 creator A5031876273 @default.
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• W4383345805 date "2023-10-01" @default.
• W4383345805 modified "2023-10-17" @default.
• W4383345805 title "Synthesis, characterization, and catalytic evaluation of palladium PEPPSI complexes bearing unsymmetrical NHC ligands in Suzuki–Miyaura reactions" @default.
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• W4383345805 doi "https://doi.org/10.1016/j.ica.2023.121676" @default.
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