Thermal cyclotrimerization of tetraphenyl[5]cumulene (tetraphenylhexapentaene) to a tricyclodecadiene derivative.

@article{Islam2009ThermalCO,
  title={Thermal cyclotrimerization of tetraphenyl[5]cumulene (tetraphenylhexapentaene) to a tricyclodecadiene derivative.},
  author={N. Islam and T. Ooi and T. Iwasawa and M. Nishiuchi and Y. Kawamura},
  journal={Chemical communications},
  year={2009},
  volume={5},
  pages={
          574-6
        }
}
Tetraphenyl[5]cumulene (tetraphenylhexapentaene) underwent cyclotrimerization in refluxing toluene for 10-15 min to give a tricyclodecadiene derivative in 68% yield. 
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