Chem. Commun., 2026, Accepted Manuscript DOI: 10.1039/D6CC02142E, Communication Chen Chen, Xin-Yu Hu, Bing-Xiao Li, Heng-Yi Zhao, Ai-Ting Shi, Bolin Zhu We report a ligand-controlled palladium-catalyzed carbonylation of thianthrenium salts employing HCOOH or DCOOD as a CO source. This divergent method enables the synthesis of (deuterated) aromatic aldehydes, aromatic or alkenyl...