The conjugate addition of cyclohexenone (enone) followed by the alkylation of its enolate is animated in this video. The reaction is driven by regiochemical and stereochemical control, which will result in two products formed, one being the minor product (‘suprafacial’) and the other is a major product (‘antarafacial’). When a part of a molecule ('molecular fragment') undergoes two changes in bonding (bond-making or bond-breaking), these bonding changes may be related in one of two spatially different ways. These are designated as 'suprafacial' if only one face of the molecular fragment is involved or 'antarafacial' if opposite faces of the molecular fragment are involved.