Abstract
•New imidazolinium salts and their PEPPSI-type palladium-complexes were synthesized.•Structures of new compounds were characterized by different spectroscopic techniques.•The catalytic activities of palladium-complexes were tested in the direct arylation of five-membered aromatic N-heterocycles with (hetero)aryl bromides by via C-H functionalization.
In this study, a series of air- and moisture-stable imidazolidin-2-ylidene-based new palladium complexes with the general formula [PdX2(NHC)(Py)] were synthesized (NHC = N-heterocyclic carbene, Py = pyridine, X = Cl or I). The structures of the palladium complexes were characterized by different techniques such as 1H NMR, 13C NMR, FT-IR spectroscopy and elemental analysis. The more detailed structural characterization of one of the palladium complex was determined by single-crystal X-ray diffraction study. The catalytic activities of all palladium complexes were tested in the direct arylation of five-membered aromatic N-heterocycles such as 3,5-dimethylisoxazole and 1-methyl-1H-pyrrole-2-carboxaldehyde with (hetero)aryl bromides in presence of 1 mol% catalyst loading at 120 °C. Desired products were obtained in moderate to good yields.
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