What is the product of a Dieckmann condensation of dimethyl adipate?

![enter image description here](https://i.stack.imgur.com/LyrlH.jpg)


**My attempt:** $\ce{MeO-}$ preferably gives SN2 *or* E2, being a strong base and good nucleophile. But which reaction proceeds in this case?




*I've given a strong hint by changing the title of your question!*


* Methoxide as a base can abstract a proton from an acidic $\alpha$-position of an ester, that is from $\ce{-C\color\red{H}\_2COOMe}$.
* The resulting carbanion/enolate can add to the other ester group of your starting material.
* The cyclic intermediate eventually loses methoxide to form ...


This *Dieckmann* condensation is the intramolecular variant of a *Claisen* condensation.


*I suggest to do it on paper!*



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>  ![Dieckmann condensation of methyl adipate](https://i.stack.imgur.com/rI785.png)
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