Conjugated ester
= Conjugated ester
A <conjugated ester> has an ester carbonyl group participating in a conjugated electronic system, commonly an adjacent carbon-carbon <double bond>. An α,β-unsaturated <ester> is an important example.
Conjugation connects reactivity at the carbonyl carbon with reactivity at the more distant β carbon. Distinguishing direct carbonyl addition from <conjugate addition> is consequently essential when predicting products.