Abstract
Rh(III)-catalyzed B(4)-azo coupling reactions of o-carborane acids with aryl diazonium tetrafluoroborates have been developed, leading to the regioselective formation of B(4)-azo-coupled o-carboranes. Moreover, B(4)-azo-coupled o-carboranes can be further functionalized by introducing a second azo group, producing B(4)-C(1)-di(arylazo) o-carborane. The B(4)-azo group as an efficient directing group enables catalytic C-H amidation reactions, providing a new synthetic route for complex o-carborane derivatives.
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