Chem. Sci., 2025, Accepted Manuscript DOI: 10.1039/D5SC05285H, Edge Article Akifumi Sumida, Kaisei Yamamoto, Takahiro Iwamoto, Kensuke Naka, Hiroaki Imoto Despite their significant potential in organometallic chemistry, the utility of arsines as ligands in transition-metal catalysis remains underexplored relative to their phosphine counterparts. Although the Pd-catalyzed C–H difunctionalization of thiophene...