Illustrated Glossary of Organic Chemistry

Cyclopentadiene (cyclopenta-1,3-diene): A conjugated diene hydrocarbon of molecular formula C5H6. Deprotonation of cyclopentadiene produces the highly stable cyclopentadienyl anion, which is aromatic. Removal of hydride ion from cyclopentadiene produces the highly unstable cyclopentadienyl cation, which is antiaromatic.

Molecular Structure of Cyclopentadiene







Lewis structure
  
Ball and spoke
  
Space filling model
  
Molecular model kit