Abstract
Two series of palladium complexes of the type [PdBr2(NHC)2] (4–6) and [PdBr2(NHC)Py] (7–9) bearing coumarin substituted triazole–based NHC ligands have been reported. Complexes have been prepared by in situ deprotonation of 1,2,4-triazolium salts with palladium acetate in DMSO/pyridine, and characterized by spectral and analytical techniques. The complexes displayed a distorted square–planar coordination geometry around the palladium atom, which is evidenced by the single crystal X–ray diffraction analysis of 4–6 and 9. Both the series of complexes have been evaluated for their efficacies in C–C bond formation reactions of various aryl bromides with phenylboronic acid, and C–H activation reactions of thiophene substituted cyanopyridine derivative. Complexes 7–9 outperformed the bis–NHC coordinated derivatives, 4–6, in both the type of catalytic reactions, which is attributed to the presence of a labile pyridine ligand.
Published Version
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