| Cyclopentane | |
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Cyclopentane |
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Other names
pentamethylene |
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| Identifiers | |
| CAS number | 287-92-3 |
| PubChem | 9253 |
| ChemSpider | 8896 |
| ChEBI | CHEBI:23492 |
| RTECS number | GY2390000 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | C5H10 |
| Molar mass | 70.1 g/mol |
| Appearance | clear, colorless liquid |
| Density | 0.751 g/cm3 |
| Melting point |
−94 °C |
| Boiling point |
49 °C, 322 K, 120 °F |
| Acidity (pKa) | ~45 |
| Related compounds | |
| Related compounds | cyclopropane, cyclobutane, cyclohexane |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
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[1]
More advanced technologies, such as computer hard drives and outerspace equipment employ multiply alkylated cyclopentane (MAC) lubricants because of their extremely low volatility.[2]
The United States produces more than half a million kilograms of this chemical per year.
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.
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