|Molar mass||70.1 g/mol|
|Appearance||clear, colorless liquid|
|Melting point||−93.9 °C (−137.0 °F; 179.2 K)|
|Boiling point||49.2 °C (120.6 °F; 322.3 K)|
|156 mg·l−1 (25 °C)|
|Solubility||soluble in ethanol, acetone, ether|
|Vapor pressure||400 mmHg (31 °C)|
Refractive index (nD)
|Flash point||−37.2 °C (−35.0 °F; 236.0 K)|
|361 °C (682 °F; 634 K)|
|US health exposure limits (NIOSH):|
|TWA 600 ppm (1720 mg/m3)|
IDLH (Immediate danger)
|cyclopropane, cyclobutane, cyclohexane|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Cyclopentane is a highly flammable alicyclic hydrocarbon with chemical formula C5H10 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 occurs as a colorless liquid with a petrol-like odor. Its melting 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 rings of carbon atoms.
Cyclopentane is used in the manufacture of synthetic resins and rubber adhesives and also as a blowing agent in the manufacture of polyurethane insulating foam, as found in many domestic appliances such as refrigerators and freezers, replacing environmentally damaging alternatives such as CFC-11 and HCFC-141b
More advanced technologies, such as computer hard drives and outerspace equipment employ multiply alkylated cyclopentane (MAC) lubricants because of their extremely low volatility.
The United States produces more than half a million kilograms of this chemical per year.
Formulation of cycloalkanes
Cycloalkanes can be formulated via a process known as catalytic reforming.
For example, 2-methylbutane can be reformed into cyclopentane, by use of a platinum catalyst. This is particularly well. known in automobiles, as branched alkanes will burn much more readily.
- Record of cyclopentane in the GESTIS Substance Database of the IFA, accessed on 28 February 2015
- "NIOSH Pocket Guide to Chemical Hazards #0171". National Institute for Occupational Safety and Health (NIOSH).
- J. Wislicenus and W. Hentschel (1893) "Der Pentamethenylalkohol und seine Derivate" (Cyclopentanol and its derivatives), Annalen der Chemie, 275 : 322-330; see especially pages 327-330. Wislicenus prepared cyclopentane from cyclopentanone ("Ketopentamethen"), which is prepared by heating calcium adipate.
- Greenpeace - Appliance Insulation
- Pennzane - lubrication technology