cis-2-Butene
- CAS NO.：590-18-1
- Empirical Formula: C4H8
- Molecular Weight: 56.11
- MDL number: MFCD00009294
- EINECS: 209-673-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:54:56
What is cis-2-Butene?
Chemical properties
colourless gas
Definition
ChEBI: Cis-but-2-ene is a but-2-ene.
General Description
A colorless liquefied petroleum gas. Boiling point 3.7°C. Asphyxiate gas. Flammability limits in air 1.8-9.7% by volume.
Air & Water Reactions
Highly flammable. Insoluble in water.
Reactivity Profile
The unsaturated aliphatic hydrocarbons, such as CIS-2-BUTENE, are generally much more reactive than the alkanes. Strong oxidizers may react vigorously with them. Reducing agents can react exothermically to release gaseous hydrogen. In the presence of various catalysts (such as acids) or initiators, compounds in this class can undergo very exothermic addition polymerization reactions. Aluminum borohydride reacts with alkenes and in the presence of oxygen, combustion is initiated even in the absence of moisture.
Purification Methods
The gas is dried with CaH2 and purified by gas chromatography. [Beilstein 1 H 205, 1 II 176, 1 III 728, 1 IV 778.] HIGHLY FLAMMABLE.
Properties of cis-2-Butene
| Melting point: | −139 °C(lit.) |
| Boiling point: | 3.7 °C(lit.) |
| Density | 0,62 g/cm3 |
| vapor density | 2 (vs air) |
| vapor pressure | 1414 mm Hg ( 21 °C) |
| refractive index | 1.3842 |
| Flash point: | −99 °F |
| explosive limit | 9.7% |
| Merck | 1520 |
| BRN | 1361341 |
| Stability: | Stable, but prone to polymerization in the presence of suitable catalysts. Extremely flammable. Readily forms explosive mixtures with air. Can lead to flash fires. Incompatible with strong oxidizing agents, halogens, halogen acids, magnesium perchlorate. |
| CAS DataBase Reference | 590-18-1(CAS DataBase Reference) |
| EPA Substance Registry System | cis-2-Butene (590-18-1) |
Safety information for cis-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 |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P410+P403:Protect from sunlight. Store in a well-ventilated place. |
Computed Descriptors for cis-2-Butene
New Products
2-(2-Chlorophenyl)glycine Propiolic Acid 1-(3-Hydroxy-4-methoxyphenyl)-2-nitroethene (±)-amino(2-fluorophenyl)acetic acid trans-3-Benzyloxy-4-methoxy-beta-nitrostyrene 1-Pentadecanol 2,4-Dihydroxybenzaldehyde Dipropyl disulfide Pyrrolo[1,2-a]pyrimidine-6-carboxylic acid, 4,6,7,8-tetrahydro-4-oxo-, sodium salt (1:1), (6S) Obidoxime hydrochloride API 4 pentyn 1 ol N-Vinylformamide Methacrylate-PEG-Methacrylate, Mn:35000 2,4-Dihydroxyacetophenone 2-Chloro 5-Fluoro Pyridine Vasicinone 2-Chloroisonicotinic Acid Tween 80 or Polysorbate 80 2-Butyn-1-oL N-(4-Cyano-3-(trifluoromethyl)phenyl)-2-methyloxirane-2-carboxamide N-(4-fluoro-2-methoxy-5-nitrophenyl)-4-(1-methyl-1H-indol-3-yl)pyrimidin-2-amine Pirtobrutinib intd. 2-Pentyn-1-oL 4-NitrobenzotrifluorideRelated products of tetrahydrofuran
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