A diketone that has its two ketone functionalities on adjacent atoms.
| Member | Definition | Role |
|---|
| (S)-4,5-dihydroxypentane-2,3-dione | Pentane substituted at the 2- and 3-positions by oxo groups, at the 4- and 5-positions by hydroxy groups and with S stereoconfiguration at C-4. | (S)-4,5-dihydroxypentane-2,3-dione |
| 1-phenyl-1,2-propanedione | An alpha-diketone that consists of 1-phenylpropane bearing keto substituents at positions 1 and 2. It is found in coffee. | 1-phenyl-1,2-propanedione |
| 2,3-hexanedione | An alpha-diketone that is hexane substituted by oxo groups at positions 2 and 3 respectively. | hexane-2,3-dione |
| 2,3-pentanedione | An alpha-diketone that is pentane substituted at the 2- and 3-positions by oxo groups. | pentane-2,3-dione |
| benzil | An alpha-diketone that is ethane-1,2-dione substituted by phenyl groups at positions 1 and 2 respectively. | benzil |
| diacetyl | An alpha-diketone that is butane substituted by oxo groups at positions 2 and 3. It is a metabolite produced during the malolactic fermentation. | butane-2,3-dione |