Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

Pentane-2,4-dione (acetylacetone) has two kinds of alpha positions : the central CH₂ and the two equivalent terminal CH₃ groups. The distinct enols are : (1) enolisation at the central carbon, CH₃-C(OH)=CH-CO-CH₃ (intramolecularly H-bonded); (2) enolisation at a terminal methyl, CH₂=C(OH)-CH₂-CO-CH₃; (3) the di-enol, CH₂=C(OH)-CH=C(OH)-CH₃. Total = 3.