Metal‐Free Arene and Heteroarene Borylation Catalyzed by Strongly Electrophilic Bis‐boranes

Abstract The geminal chelate bis‐borylalkanes 4 and 5 featuring strongly electrophilic B(C 6 F 5 ) 2 and B(C 6 F 5 ) groups, respectively, serve as efficient catalysts for the borylation of arenes and heteroarenes. The borylation reactions proceed under mild conditions with liberation of dihydrogen.