Abstract
In contrast to icosahedral carboranes, instead of deboration, 13-vertex carboranes undergo cage-carbon extrusion and cluster contraction to give icosahedral monocarborane anions on reaction with nucleophiles. In the proposed mechanism, nucleophilic attack on a cage carbon atom cleaves the CcageCcage bond, new CcageB bonds form to preserve cluster integrity, and hydrogen migration generates the final icosahedral product (see scheme).
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