Synthesis and structure of fluorophenyl derivatives of the 10-vertex monocarbaborane anions [1-CB9H10]− and [2-CB9H10]−

► New fluoroaryl carboranes [2-(X-FC6H4)-2-CB9H9]− (X = 2, 3, 4) have been synthesized. ► On heating 2-arylcarboranes rearrange to 1-arylcarboranes [1-(X-FC6H4)-1-CB9H9]−. ► Structures of the prepared fluoroaryl carboranes were determined by X-ray diffraction.