Diketone

1,3-Diketones

1,3-Diketones are also called β-diketones. An important member is acetylacetone, CH₃C(O)CH₂C(O)CH₃. Dimedone is a cyclic 1,3-diketone. 1,3-Indandione is the cyclic 1,3-diketone fused to a benzene ring. Acetylacetone is prepared industrially by the thermal rearrangement of isopropenylacetate. Another cyclic 1,3-diketone is 2,2,4,4-tetramethylcyclobutanedione, which is a precursor to a useful diol.