C8 monomers

1,5-Cyclooctadiene (COD)

Evonik is a leader in the production of industrially available cyclic C8 monomers and offers the four most important synthetic chemicals 1,5-cyclooctadiene (COD), cyclooctene (COE), cyclooctane (COAN), and 4-vinylcyclohex-1-ene (VCH).

Building blocks for your synthesis

The doubly unsaturated cyclic hydrocarbon 1,5-cyclooctadiene (COD) is a colorless liquid with a pungent odor and a boiling point of 151°C.

COD is formed by the dimerization of butadiene.

COD is an important starting material for synthesis of cyclic C8 compounds. By the use of appropriate reaction engineering, chemical reactions can be carried out selectively at one or both of the double bonds.

- Thus selective hydrogenation can be used to produce cyclooctene, the monomer of polyoctenamer (VESTENAMER®). 
- Bromination produces an effective flame retardant for Plastics.
- COD also serves in the fragrance industry for production of carriers.  

Properties of 1,5-Cyclooctadiene

Empirical formula
Molecular weight
108,2 g/mol
Melting point
-70 °C
Boiling point 1013 hPa
151 °C