Regiodivergent metal-catalyzed B(4)- and C(1)-selenylation of -carboranes.

Regiodivergent transition metal-catalyzed B(4)- and C(1)-selenylation reactions of -carboranes have been demonstrated. Namely, Ru(ii)-catalysis selectively generated B(4)-selenylated -carboranes from the reaction of -carborane acids with arylselenyl bromides with the release of carbon dioxide. In contrast, Pd(ii) catalysis provided exclusively C(1)-selenylated -carboranes from the decarboxylative reaction of -carborane acids with diaryl diselenides.