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Pentalene is a polycyclic hydrocarbon composed of two fused cyclopentadiene rings. It has chemical formula C8H6 and CAS number 250-25-9. It is antiaromatic, because it has 4n pi electrons. For this reason it dimerizes even at temperatures as low as -100°C [1] [2]

See also


  1. Carey, Francis A.; Sundberg, Richard J.; (1984). Advanced Organic Chemistry Part A Structure and Mechanisms (2nd ed.). New York N.Y.: Plenum Press. ISBN 0-306-41198-9.
  2. Bally T., Chai S., Neuenschwander M., Zhu Z. (1997). "Pentalene: Formation, Electronic, and Vibrational Structure" (PDF). J. Am. Chem. Soc. 119: 1869-1875(7). doi:10.1021/ja963439t. Retrieved 2007-07-06.

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