Back Siklopentaan Afrikaans حلقي البنتان Arabic Siklopentan Azerbaijani سیکلوپنتان AZB Цыклапентан Byelorussian Циклопентан Bulgarian Ciclopentà Catalan Cyklopentan Czech Cyclopentan German Κυκλοπεντάνιο Greek
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| Names | |||
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| Preferred IUPAC name
Cyclopentane | |||
| Other names
pentamethylene
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| Identifiers | |||
3D model (JSmol)
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| ChEBI | |||
| ChemSpider | |||
| ECHA InfoCard | 100.005.470 | ||
| EC Number |
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PubChem CID
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| RTECS number |
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| UNII | |||
CompTox Dashboard (EPA)
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| Properties | |||
| C5H10 | |||
| Molar mass | 70.1 g/mol | ||
| Appearance | clear, colorless liquid | ||
| Odor | mild, sweet | ||
| Density | 0.751 g/cm3 | ||
| 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)[1] | |||
| Solubility | soluble in ethanol, acetone, ether | ||
| Vapor pressure | 45 kPa (20 °C) [2] | ||
| Acidity (pKa) | ~45 | ||
| -59.18·10−6 cm3/mol | |||
Refractive index (nD)
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1.4065 | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards
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Flammable[3] | ||
| NFPA 704 (fire diamond) | |||
| Flash point | −37.2 °C (−35.0 °F; 236.0 K) | ||
| 361 °C (682 °F; 634 K) | |||
| Explosive limits | 1.1%-8.7%[3] | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible)
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none[3] | ||
REL (Recommended)
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TWA 600 ppm (1720 mg/m3)[3] | ||
IDLH (Immediate danger)
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N.D.[3] | ||
| Related compounds | |||
Related compounds
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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)[4] 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 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 cracking cyclohexane in the presence of alumina at a high temperature and pressure.
It was first prepared in 1893 by the German chemist Johannes Wislicenus.[5]
- ^ Record of cyclopentane in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 28 February 2015.
- ^ "ICSC 0353 - CYCLOPENTANE".
- ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0171". National Institute for Occupational Safety and Health (NIOSH).
- ^ Sárkány, A.; Gaál, J.; Toth, L. (1981). "Comparative Study of C-Pentane and N-Pentane Transformations on Ni and Pt Catalysts". Studies in Surface Science and Catalysis. 7: 291–301. doi:10.1016/S0167-2991(09)60278-0.
- ^ Wislicenus, J.; Hentschel, W. (January 1893). "III. Der Pentamethenylalkohol und seine Derivate (Cyclopentanol and its derivatives)" (PDF). Justus Liebigs Annalen der Chemie. 275 (2–3): 322–330. doi:10.1002/jlac.18932750216.