Methyl vinyl ketone
= Methyl vinyl ketone
<Methyl vinyl ketone> is $\mathrm{CH_2{=}CHCOCH_3}$, an alpha,beta-unsaturated <ketone>. Conjugation connects its carbon-carbon double bond with the carbonyl group.
A nucleophile can therefore react at the carbonyl carbon or through conjugate addition at the beta carbon. The product depends on the nucleophile and conditions, illustrating how conjugation creates more than one electrophilic site.