Trans-2-butene (C₄H₈)

Trans-2-butene (C₄H₈)

A colorless, heavier-than-air gas. Its geometric isomer is cis-2-butene.



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Trans-2-butene C₄H₈


Molar mass: 56.107 g/mol

Melting point: -105.5 °C (-157.9 °F)

Boiling point: 0.9 °C (33.62 °F)

Density: 0.6042 g/cm³ (0.0218 lb/in³)

Relative steam density (air=1): 1.9

Heat of combustion: -2,706.0 kJ/mol


Butene has 4 structural isomers: 1-butene, cis-2-butene, trans-2-butene and 2-methylpropene. These four forms can easily be converted into each other by isomerization. Trans-2-butene is an unsaturated, combustible, colorless gas. It barely dissolves in water but dissolves well in alcohols and ethers. It is a ’liquefied gas’; these gases can be brought to a liquid state at room temperature under the proper amount of pressure.

Occurrence and production

Butene isomers do not occur in nature. They are produced from the waste gases from oil refineries and from the crack gas released during the production of ethylene.


Trans-2-butene is used in the production of polymer petrol, isoprene, alcohols, adhesives and sealants. It can be polymerized into plastics similar to polyethylene as well as into butyl rubber and anti-knock materials.

Related items

Cis-2-butene (C₄H₈)

A colorless, heavier-than-air gas. Its geometric isomer is trans-2-butene.

1-butene (C₄H₈)

One of the isomers of butene.

Butane (C₄H₁₀)

The fourth member in the homologous series of alkanes.

Optical isomerism

Mirror image isomers of asymmetrical shapes and solids are non-superimposable.

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