Transition metal-mediated B(4)–H hydroxylation/halogenation of o-carboranes bearing a 2-pyridylsulfenyl ligand

Regioselective rhodium-induced B(4)–H hydroxylation and halogenation reactions of o-carboranes are reported. The key intermediate has been isolated. Iridium-induced B(3)/B(4)–H activation of o-carboranes has been achieved through steric control.