Enolate anion
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An enolate anion is an anion derived by loss of a proton from the alpha carbon of a carbonyl group; it is the anion of an enol.
For instance, a base abstracts one proton from acetone to form enolate anion.
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Enolate.png
Image:enolate.png
The enolate anion is stabilised by resonance and therefore the alpha hydrogen is acidic.