Flowery scenting dodeca-4,8-diene-1,12 dialdehyde prodn. - by ozonolysis of cyclododeca-1,5,9-triene followed by reduction of ozonide

Dodeca-4,8-diene-1,12-dialdehyde is produced by ozonolysis of cyclododeca-1,5,9-triene, and then reducing the resulting ozonide, pref. in an inert organic solvent, esp. a mixt. of acetic acid and petroleum ether. The reduction of the ozonide is pref. carried out with zinc in the presence of acetic acid. When cyclodedeca-1 trans, 5 trans, 9 trans-triene is used as a starting material, dodeca-4 trans, 8 trans-diene-1,12-dialdehyde is obtd; from the 1 trans, 5 trans, 9 cis-stereoisomer the 4 trans, 8 cis-product is obtd., and from 1 cis, 5 cis, 9 cis-stereoisomer the 4 cis, 8 cis-product. The first and the third of these isomers are new cpds. These cpds. have flowery scent and can be used in perfumes, cosmetics, foodstuffs, drinks, pharmaceuticals etc.