Corannulene cyclopentacorannulene

Sygula, A., 8c Rabideau, P. W. (1999). Non-pyrolytic syntheses of buckybowls Corannulene, cyclopentacorannulene, and a semibuckmin-sterfullerene. Journal of the American Chemical Society, 121, 7800-7803. 

Cyclopentacorannulene (67) was obtained as a mixture with corannulene (in ratio 7 3) in 10-15% yield from dichloride 66 by flash vacuum pyrolysis at 1,000 °C (Scheme 18) [106]. In contrast, 67 could also be prepared, in 20% yield, by titanium-mediated carbenoid couplings of 68 in solution phase [34]. 

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