keto-enol tautomerism
chemistry
Learn about this topic in these articles:
acid-base catalysis
- In acid–base reaction: Keto–enol tautomerism, acid- and base-catalyzed
Acids and bases both bring about the establishment of an equilibrium between ketones (or aldehydes) and their enol forms, which contain a hydroxyl group directly attached to a doubly bonded carbon atom:
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description
- In tautomerism
…is that involving carbonyl, or keto, compounds and unsaturated hydroxyl compounds, or enols; the structural change is the shift of a hydrogen atom between atoms of carbon and oxygen, with the rearrangement of bonds as indicated:
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genetic mutations
- In heredity: Mechanisms of mutation
The keto form of a DNA base is the normal form that gives the molecule its standard base-pairing properties. However, the keto form occasionally changes spontaneously to the enol form, which has different base-pairing properties. For example, the keto form of cytosine pairs with guanine (its…
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