10. A diatropic ring current in a fluorofullerene trannulene

Ipsocentric current-density maps for a fluorofullerene derivative, C₆₀F₁₅H₃, modelling the addition pattern of the experimentally characterised C₆₀F₁₅[CBr(CO₂Et)₂]₃ which contains an [18]trans-annulene system, reveal a diamagnetic ring current dominated by the contribution of the four HOMO electrons, as in a classical (4n + 2) aromatic annulene.