JOURNAL OF MOLECULAR STRUCTURE, vol.1246, 2021 (SCI-Expanded)
A series of benzimidazolium salts (1a-d) and their Pd-PEPPSI complexes (pyridine-enhanced precatalyst preparation, stabilization, and initiation) (2a-d) were prepared to catalyze the direct arylation of heteroaromatics (2-acetylthiophene and 2-furaldehyde) with various aryl bromides. The structures of all isolated compounds were elucidated based on spectroscopic methods (H-1 and C-13 NMR, FT-IR and LC-MS spectroscopy). Under optimized reaction conditions, C5-arylated products were obtained in moderate to excellent yields in the direct arylation of heteroaromatics. (C) 2021 Elsevier B.V. All rights reserved.