--- title: "Acetoacetic ester synthesis Template | MolDraw" url: https://www.moldraw.com/templates/acetoacetic-ester-synthesis/ description: "Acetoacetic ester synthesis template: Ethoxide deprotonates ethyl acetoacetate, the enolate does SN2 on benzyl bromide, acid hydrolysis gives the β-keto…" lang: en publisher: Scidart Academy generated: 2026-11-13 --- [MolDraw](https://www.moldraw.com/) › [Templates](https://www.moldraw.com/templates/) › [Mechanisms](https://www.moldraw.com/templates/mechanisms/) › Acetoacetic ester synthesis [Mechanisms](https://www.moldraw.com/templates/mechanisms/)Premium # Acetoacetic ester synthesis template ![Acetoacetic ester synthesis template: Ethoxide deprotonates ethyl acetoacetate, the enolate does SN2 on benzyl bromide, acid hydrolysis gives the β-keto acid, and heating loses CO₂ (cyclic six-membered transition state) to the enol of 4-phenylbutan-2-one.](https://www.moldraw.com/templates/acetoacetic-ester-synthesis.webp) [Edit in MolDraw](https://www.moldraw.com/)Download with Pro Premium template. Preview and edit it free in MolDraw; downloading and exporting it is part of [MolDraw Pro](https://www.moldraw.com/pricing). Ethoxide deprotonates ethyl acetoacetate, the enolate does SN2 on benzyl bromide, acid hydrolysis gives the β-keto acid, and heating loses CO₂ (cyclic six-membered transition state) to the enol of 4-phenylbutan-2-one. ## Mechanism step by step Alkylate ethyl acetoacetate, then hydrolyse and decarboxylate to a methyl ketone 1. **Enolate** – Ethoxide removes the α-H between the two C=O (pKa ≈ 11) 2. **Alkylation (SN2)** – The enolate carbon attacks benzyl bromide 3. **Hydrolysis** – Summarised: the ethyl ester is hydrolysed to the β-keto acid 4. **Decarboxylation** – Cyclic six-membered transition state: the ketone C=O takes the CO₂H proton as CO₂ leaves 5. **Tautomerisation** – Summarised: the enol gives the methyl ketone ## Key points - Ethyl acetoacetate is the synthetic equivalent of the acetone enolate ⁻CH₂COCH₃: R–X → R–CH₂–CO–CH₃. - The doubly activated CH₂ (pKa ≈ 11) is deprotonated completely by NaOEt, so the ketone does not self-condense; a second alkylation gives R¹R²CH–COCH₃. - Hydrolysis and heating lose CO₂ from the β-keto acid via the enol (see Decarboxylation of a β-keto acid). - Hot concentrated NaOH instead cleaves the C–C bond (retro-Claisen) to two carboxylates, so dilute acid is used. Drawn with 164 atoms, 13 arrows, 9 shapes – every one editable in MolDraw. ## Sources - [Clayden, Greeves & Warren, Organic Chemistry, 2nd ed., OUP 2012, ch. 25](https://openlibrary.org/isbn/9780199270293) Textbook - [Smith, March's Advanced Organic Chemistry, 8th ed., Wiley 2020, ch. 10](https://openlibrary.org/isbn/9781119371809) Textbook ## How to use this template 1. Press **Edit in MolDraw**. The template opens on the canvas of the free MolDraw editor. 2. Change anything: move structures, edit atoms and labels, recolour highlights or delete what you do not need. 3. Add your own structures, arrows and text next to it, or combine several templates on one page. 4. Export the drawing as PNG, SVG or PDF for slides, worksheets, theses and papers. ## Frequently asked questions ### Is the Acetoacetic ester synthesis template free? You can preview the Acetoacetic ester synthesis template here and open and edit it in MolDraw for free. Downloading or exporting it is part of MolDraw Pro, together with the other premium templates. ### Can I edit the Acetoacetic ester synthesis template? Yes. It opens as an ordinary MolDraw drawing, so every structure, arrow, label and colour can be changed, and you can add your own content around it. ### Is the chemistry checked? Every structure is checked with RDKit and every curly arrow passes MolDraw’s electron-flow audit. The sources used are listed on this page. ### What is a curly-arrow mechanism template? A ready-made drawing of a reaction mechanism in which curved arrows show where electron pairs move in each step. 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