\(\underset{\begin{smallmatrix}
keto\,\,form \\
(Acetylacetone)
\end{smallmatrix}}{\mathop{\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|| \\
C{{H}_{3}}-C-C{{H}_{2}}-C-C{{H}_{3}} \\
\end{matrix}}}\,\) \( \rightleftharpoons \) \(\mathop {\begin{array}{*{20}{c}}
{O - H - - O} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{C{H_3} - C = CH - C - C{H_3}}
\end{array}}\limits_{enol\,\,form} \)