Any fatty aldehyde containing more than one double or triple bond located at any position in the aliphatic chain.
| Member | Definition | Role |
|---|
| 2,4-decadienal | A polyunsaturated fatty aldehyde that is decanal which has undergone formal dehydrogenation to introduce trans- double bonds at the 2-3 and 4-5 positions. A product of lipid peroxidation in cell membranes and a component of cooking oil fumes. | (2E,4E)-deca-2,4-dienal |
| 2,4-hexadienal | A hexadienal that is hexanal with trans double bonds at positions 2 and 4. It is found in tomatoes, kiwi fruit, mangoes, potato chips, herbs and spices. | (E,E)-2,4-hexadienal |
| 2,6-nonadienal, (e,z)-isomer | | 2,4-Nonadienal |