From Wikipedia, the free encyclopedia
Jump to: navigation, search
Cyclopentene Ball-and-stick model of cyclopentene
Space-filling model of cyclopentene
CAS number 142-29-0 YesY
PubChem 8882
ChemSpider 8544 YesY
ChEBI CHEBI:49155 YesY
Jmol-3D images Image 1
Molecular formula C5H8
Molar mass 68.11 g/mol
Density 0.771 g/cm3
Melting point −135 °C (−211 °F; 138 K)
Boiling point 44 to 46 °C (111 to 115 °F; 317 to 319 K)
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point −29 °C (−20 °F; 244 K)
Related compounds
Related compounds Cyclopentadiene
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Cyclopentene is a chemical compound with the formula C5H8.[1] It is a colorless liquid with a petrol-like odor. It is one of the cycloalkenes.

Cyclopentene is produced industrially in large amounts. It is used as a monomer for synthesis of plastics, and in a number of chemical syntheses.

It can be obtained from vinylcyclopropane in the vinylcyclopropane-cyclopentene rearrangement.


  1. ^ "cyclopentene". Retrieved June 15, 2012.