2-Butene
- CAS NO.：107-01-7
- Empirical Formula: C4H8
- Molecular Weight: 56.11
- MDL number: MFCD00064458
- EINECS: 203-452-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-08 10:32:36
What is 2-Butene?
Chemical properties
2-butene appears as a colorless liquefied petroleum gas. Asphyxiate gas. Flammability limits in air 1.8-9.7% by volume.
The Uses of 2-Butene
2-Butene can be used as an intermediate, mainly for dehydrogenation to butadiene.
Definition
ChEBI: But-2-ene is a butene.
General Description
2-Butene is an alkene. All-silica zeolite RUB-41, containing 8- and 10-membered rings, is reported to be capable of separating trans-2-butene and cis-2-butene from 1-butene. Asymmetric gydrozirconation of cis- and trans-2-butene is reported. Stereospecific addition of methylene to trans-2-butene is reported to afford trans-1,2dimethylcyclopropane while similar addition to cis-2-butene affords cis-1,2dimethylcyclopropane.
Flammability and Explosibility
Extremely flammable
Properties of 2-Butene
| Melting point: | −140 °C(lit.) |
| Boiling point: | 1 °C(lit.) |
| Density | 0.6210 |
| vapor density | 2 (vs air) |
| vapor pressure | 2575 mm Hg ( 37.7 °C) |
| refractive index | 1.3853 (estimate) |
| Flash point: | <−30 °F |
| explosive limit | 9.3% |
| Water Solubility | 242.5mg/L at 25℃ |
| Merck | 1520 |
| BRN | 1718755 |
| CAS DataBase Reference | 107-01-7(CAS DataBase Reference) |
| EPA Substance Registry System | 2-Butene (107-01-7) |
Safety information for 2-Butene
| Signal word | Danger |
| Pictogram(s) |
 Flame Flammables GHS02  Gas Cylinder Compressed Gases GHS04 |
| GHS Hazard Statements |
H220:Flammable gases H280:Gases under pressure |
| Precautionary Statement Codes |
P410+P403:Protect from sunlight. Store in a well-ventilated place. |
Computed Descriptors for 2-Butene
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