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: 2026-06-09 13:55:34

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.