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- Ketone
tautomerization, keto-form at left, enol at right. Ex. is 3-pentanone, a less stabilized enol. (en)
- Enolate resonance structures, schematic representation of forms ; carbanion form at left, enolate at right; Ex. is 2-butanone, also a less stabilized enol. (en)
- Aldehyde tautomerization, enol-form at left, "keto" at right; Ex. is tartronaldehyde , an enediol-type of enol. (en)
- Ketone tautomerization, enol-form at left, keto at right. Ex. is 2,4-pentanedione, a hydrogen bond stabilized enol. (en)
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