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The enolate carbon attacks the conjugated system of the enone to form a new enolate. This reaction is known as conjugate addition because it requires a conjugated system. Protonation reforms the carbonyl group.
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A. G. Csákÿ, G. de la Herrán and M. C. Murcia, Chem. Soc. Rev., 2010, 39, 4080.