Cyclododecatriene C12H18 is a cycloalkene with three alkene groups. The 1,5,9-trans-trans-cis isomer has some industrial importance and is obtained by cyclotrimerization of butadiene with titanium tetrachloride and an organoaluminium co-catalyst: This compound is the raw material for the production of dodecanedioic acid (4) through hydrogenation t...