Benzoylacetone is the organic compound with the nominal formula C<sub>6</sub>H<sub>5</sub>C(O)CH<sub>2</sub>C(O)CH<sub>3</sub>. As a 1,3-dicarbonyl, it is a precursor to many heterocycles, such as pyrazoles. It exists predominantly as the enol tautomer C<sub>6</sub>H<sub>5</sub>C(OH)=CHC(O)CH<sub>3</sub>. Its conjugate base (pK<sub>a</sub>=8.7) forms stable complexes with transition metals and lanthanides.