乙酰丙酮是一个有机化合物，缩写Hacac，其标准命名为2,4-戊二酮。它是一个双齿配体，并且在杂环化合物的合成中有很多用处。

乙酰丙酮具有烯醇和酮的互变异构：

乙酰丙酮可由三氟化硼存在下，丙酮被乙酸酐酰化制得。

也可由丙酮和乙酸乙酯缩合制得。

Acetylacetone is an organic compound that exists in two tautomeric forms that interconvert rapidly and are treated as a single compound in most applications. Although the compound is formally named as the diketone form, pentane-2,4-dione, the enol form forms a substantial component of the material and is actually the favored form in many solvents. It is a colourless liquid that is a precursor to acetylacetonate (acac), a common bidentate ligand. It is also a building block for the synthesis of heterocyclic compounds.