enol-keto tautomerism

enol-keto tautomerism

[¦ē·nȯl ¦kēd·ō tȯ′tä·mə‚riz·əm]
(organic chemistry)
The tautomeric migration of a hydrogen atom from an adjacent carbon atom to a carbonyl group of a keto compound to produce the enol form of the compound; the reverse process of hydrogen atom migration also occurs.
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Particularly, the enol-keto tautomerism in the investigated structures can be expressed by a first-order rate equation: In [A.sub.0]/[A.sub.t], = kt, where [A.sub.0] and [A.sub.t] are the values of the absorbance at time [t.sub.0] and t, respectively, and k is the rate constant.