ABSTRACT Seven new PEPPSI (Pyridine‐Enhanced Precatalyst Preparation Stabilization and Initiation) type complex compounds containing bisbenzimidazole ligands were synthesized, and their structures were characterized by spectroscopic methods ( 1 H, 13 C‐NMR, IR, HRMS). The catalytic activities of PEPPSI‐precatalysts were tested in Suzuki‐Miyaura cross‐coupling reactions using phenylboronic acid, aryl bromides and aryl chlorides. It was observed that the precatalysts, having electron‐dense benzimidazole ligands (compounds 1 , 2 ), exhibited higher catalytic activity. In contrast, catalyst precursors having electron‐poor benzimidazole ligands were found to have lower catalytic activity (compound 7 ).
Yılmaz et al. (Wed,) studied this question.