Iridium-Catalyzed Cyclative Indenylation and Dienylation through Sequential B(4)–C Bond Formation, Cyclization, and Elimination from <i>o</i>‑Carboranes and Propargyl Alcohols

Described herein is the first iridium-catalyzed cyclative indenylation through sequential B(4)–C and intramolecular C–C bond formation from o-carboranes and propargyl alcohols, leading to the formation of B(4)-indenylated o-carboranes with excellent regioselectivity via direct B–H activation. Moreover, the iridium-catalyzed regioselective 1,3-dienylation has been accessed through sequential B–H activation, dehydration, and decarboxylation, producing B(4)-dienylated o-carboranes.