While the carborane-based catalysts cannot yet compete with the performance of dicationic halogen bond donors in other reactions (like Diels-Alder cycloaddition reactions), the current findings nevertheless provide a strong basis for further improvement, e.g. by rotationally locking the halogen bonding moieties or by introducing a further (e.g., Lewis basic) functionality into the catalyst structure. Investigations in this direction are currently ongoing in our lab.