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Topic summary

Cyclopentane

Related topics
Names Preferred IUPAC name
Cyclopentane
Other names
pentamethylene
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard100.005.470EC Number
  • 206-016-6
RTECS number
  • GY2390000
UNII
  • InChI=1S/C5H10/c1-2-4-5-3-1/h1-5H2
    Key: RGSFGYAAUTVSQA-UHFFFAOYSA-N
  • InChI=1/C5H10/c1-2-4-5-3-1/h1-5H2
    Key: RGSFGYAAUTVSQA-UHFFFAOYA
  • C1CCCC1
Properties C5H10Molar mass70.135 g·mol Appearance clear, colorless liquid Odormild, sweet Density0.751 g/cm Melting point−93.9 °C (−137.0 °F; 179.2 K) Boiling point49.2 °C (120.6 °F; 322.3 K) 156 mg·l (25 °C) Solubilitysoluble in ethanol, acetone, etherVapor pressure45 kPa (20 °C) Acidity (pKa) ~45 −59.18·10 cm/mol 1.4065 Hazards Occupational safety and health (OHS/OSH):
Main hazards
Flammable NFPA 704 (fire diamond)
1
3
0
Flash point−37.2 °C (−35.0 °F; 236.0 K) 361 °C (682 °F; 634 K) Explosive limits1.1%–8.7% NIOSH (US health exposure limits):
PEL (Permissible)
none
REL (Recommended)
TWA 600 ppm (1720 mg/m)
IDLH (Immediate danger)
N.D. Related compounds
Related compounds
cyclopropane, cyclobutane, cyclohexane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cyclopentane (also called C pentane) is a highly flammablealicyclichydrocarbon with chemical formulaC5H10 and CAS number 287-92-3, consisting of a ring of five carbon atoms each bonded with two hydrogen atoms above and below the plane. It is a colorless liquid with a petrol-like odor. Its freezing point is −94 °C and its boiling point is 49 °C. Cyclopentane is in the class of cycloalkanes, being alkanes that have one or more carbon rings. It is formed by crackingcyclohexane in the presence of alumina at a high temperature and pressure.

It was first prepared in 1893 by the German chemist Johannes Wislicenus.

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