Cyclooctene (COE)

C8-Monomers - Building blocks for your synthesis 

The singly unsaturated cyclic hydrocarbon cyclooctene (COE) is a colorless liquid with a boiling point of 145°C.

COE is formed by selective hydrogenation of cyclooctadiene. We produce COE mainly for the manufacture of polyoctenamer (VESTENAMER®) by ring-opening polymerization.

Ozonolysis of COE yields suberic acid. Various perfumes are obtained via a number of intermediate stages. Thermolysis of COE yields the Evonik product 1,7-octadiene, which is also used industrially.

Properties of Cyclooctene



Empirical formula




Molecular weight

110,2 g/mol

Melting point

-16,9 °C

Boiling point 1013 hPa

148 °C

Purity: Cycloocten

min. 96%

Purity: Cyclooctan

max. 4%

1,5-Cyclooctadien (COD)

More C8 Rings

Cyclooctan (COAN)

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Vinylcyclohexen (VCH)

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