Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

1-Phenylbutane-1,3-dione (benzoylacetone) has two kinds of alpha positions : the central $\mathrm{C}{\mathrm{H}}_2$ and the terminal $\mathrm{C}{\mathrm{H}}_3$. The distinct enols are : (1) enolisation at the central carbon (chelated, conjugated with the phenyl ring); (2) enolisation at the terminal methyl; (3) the di-enol. Total = 3.