Thus, 2,6-heptanedione condenses with methoxide in methanol to form 3-methylcyclohex-2-enone.
![aldolica-intramolecular01.gif aldolica-intramolecular01.gif](/images/stories/organica-i/enoles-enolatos/aldolica-intramolecular/aldolica-intramolecular01.gif)
The reaction mechanism proceeds through the following stages:
Stage 1. Formation of the enolate.
![aldolica-intramolecular02.gif aldolica-intramolecular02.gif](/images/stories/organica-i/enoles-enolatos/aldolica-intramolecular/aldolica-intramolecular02.gif)
Step 2. Intramolecular nucleophilic addition
![aldolica-intramolecular03.gif aldolica-intramolecular03.gif](/images/stories/organica-i/enoles-enolatos/aldolica-intramolecular/aldolica-intramolecular03.gif)
Step 3. Protonation of the aldol base
![aldolica-intramolecular04.gif aldolica-intramolecular04.gif](/images/stories/organica-i/enoles-enolatos/aldolica-intramolecular/aldolica-intramolecular04.gif)
Step 4. Dehydration of the aldol
![aldolica-intramolecular05.gif aldolica-intramolecular05.gif](/images/stories/organica-i/enoles-enolatos/aldolica-intramolecular/aldolica-intramolecular05.gif)