Heteroleptic palladium(II) complexes containing N-heterocyclic carbenes and 4-phenyl-1H-1,2,3-triazole: Synthesis,characterization, and catalytic application |
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Abstract: | AbstractReaction of the dimeric N-heterocyclic carbene (NHC) palladium compounds [Pd(μ-Cl)(Cl)(NHC)]2 with 4-phenyl-1H-1,2,3-triazole gave four mono- and dinuclear complexes 1–4. Mononuclear complexes 1 and 2 [(NHC)PdCl2(4-phenyl-1H-1,2,3-triazole)] were obtained when the reactions were performed in CH2Cl2, whereas dinuclear complexes 3 and 4 [Pd2(μ-Cl)(μ-4-phenyl-1H-1,2,3-triazole)Cl2(NHC)2] were obtained when the reactions were performed in THF in reflux with Et3N as the base. Further explorations of the catalytic properties of 1–4 for Pd-catalyzed transformations have been performed and these complexes exhibited moderate to high catalytic activities for Suzuki–Miyaura coupling and arylation of benzoxazoles with aryl bromides. |
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Keywords: | N-Heterocyclic carbene palladium 4-Phenyl-1H-1,2,3-triazole Suzuki–Miyaura coupling direct arylation |
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