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Tautomers of Acetylacetone (C5H8O2)

Usually the keto tautomer is favored

Keto = ketone

Enol = alcohol

may also be referred to as an alkenol

Keto Acetylacetone

With geometry optimization

Molecule (2).png

PubChem's 3D structure has both oxygens pointing in the same direction (left) while NIST has the oxygens pointing in different directions (right)
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KetoacetylacetoneStructure.png

Proton NMR (Hartree-Fock) NmrKetoZoomed.png

Enol Acetylacetone

Molecule.png

Proton NMR (Hartree-Fock) NmrEnol2.png NmrEnolZoomed.png