PEPPSI-type 2-methyl-2-propenyl-functionalized N-heterocyclic carbene-palladium complexes: Synthesis, structural characterization and catalytic activity on Suzuki-Miyaura reaction
Abstract
N-Heterocyclic carbenes (NHCs) have been known to be efficient ligands for the Suzuki-Miyaura cross-coupling. In this work, four novel 2-methyl-2-propenyl substituted N-heterocyclic carbene ligands (1a-d) were synthesized and they were used to produce four novel air-stable PEPPSI-type palladium-NHC complexes (2a-d). All of the new compounds were fully characterized by elemental analysis, H-1, C-13 NMR and FT-IR spectroscopies. In addition, prepared complexes (2a-d) were investigated as catalysts in the Suzuki-Miyaura coupling reaction under very mild conditions using a mixture of i-PrOH/water as a solvent and a base at the room temperature. Under optimal reaction conditions, the expected biaryl products were obtained in moderate to high yields. (C) 2018 Elsevier B.V. All rights reserved.
Source
JOURNAL OF MOLECULAR STRUCTUREVolume
1177Collections
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