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A cyclooctadiene (sometimes abbreviated COD) is any of several cyclic diene with the formula (CH2)6C2H2. Focusing only on cis derivatives, four isomers are possible: 1,2-, which is an allene, 1,3-, 1,4-, and 1,5-. Commonly encountered isomers are 1,3-cyclooctadiene and 1,5-cyclooctadiene, which is used as a ligand for transition metals. All of these dienes are colorless liquids.


  • Angew.Chem. 1963, 75, 10, 165.

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