trans-2-Pentene
- CAS NO.：109-68-2
- Empirical Formula: C5H10
- Molecular Weight: 70.13
- MDL number: MFCD00009384
- EINECS: 203-695-0
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-10-27 18:05:18
What is trans-2-Pentene?
Chemical properties
colourless liquid
The Uses of trans-2-Pentene
2-Pentene (mixture of cis and trans) is used in the synthesis of polycyclopentene by ring-opening metathesis polymerization.
General Description
2-Pentene undergoes addition reaction with phenoxathiin cation radical in acetonitrile solution to form bis(10-phenoxathiiniumyl)alkane adducts.
Purification Methods
Reflux the mixture with sodium wire, then fractionally distil it twice through a Fenske (glass helices packing, p 11) column. [Beilstein 1 IV 815.]
Properties of trans-2-Pentene
| Melting point: | -142.6°C |
| Boiling point: | 37 °C(lit.) |
| Density | 0.651 g/mL at 20 °C(lit.) |
| vapor pressure | 8.06 psi ( 20 °C) |
| refractive index | n |
| Flash point: | −50 °F |
| storage temp. | 2-8°C |
| form | clear liquid |
| color | Colorless to Almost colorless |
| Water Solubility | Not miscible or difficult to mix in water. |
| Merck | 14,7123 |
| BRN | 969151 |
| Stability: | Stable. Extremely flammable - note low boiling point and low flash point. Incompatible with strong oxidizing agents. |
| CAS DataBase Reference | 109-68-2(CAS DataBase Reference) |
| EPA Substance Registry System | 2-Pentene (109-68-2) |
Safety information for trans-2-Pentene
| Signal word | Danger |
| Pictogram(s) |
 Flame Flammables GHS02  Health Hazard GHS08 |
| GHS Hazard Statements |
H225:Flammable liquids H304:Aspiration hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. |
Computed Descriptors for trans-2-Pentene
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