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Ozonolysis template
Premium template. Preview and edit it free in MolDraw; downloading and exporting it is part of MolDraw Pro.
Ozone adds to but-2-ene (molozonide), which splits to acetaldehyde and a carbonyl oxide; they recombine to the ozonide, and Me₂S reduces it to two acetaldehydes and DMSO.
Mechanism step by step
Ozone cleaves C=C to two carbonyl groups (Criegee mechanism)
- [3+2] Cycloaddition – The primary ozonide (molozonide)
- Retro-[3+2] – Carbonyl + carbonyl oxide (Criegee intermediate)
- Recombination – The secondary ozonide (1,2,4-trioxolane)
- Me₂S attacks – The O–O bond breaks
- First aldehyde – The alkoxide re-forms C=O
- Second aldehyde – DMSO leaves
Key points
- Reductive work-up (Me₂S or Zn/AcOH) gives aldehydes and ketones.
- Oxidative work-up (H₂O₂) turns aldehydes into carboxylic acids.
- NaBH₄ work-up gives alcohols.
- Locating C=C bonds: the fragments show where the double bond was.
Drawn with 110 atoms, 22 arrows, 8 shapes – every one editable in MolDraw.
Sources
How to use this template
- Press Edit in MolDraw. The template opens on the canvas of the free MolDraw editor.
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Frequently asked questions
Is the Ozonolysis template free?
You can preview the Ozonolysis 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 Ozonolysis 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.
Which name reactions are included?
Over seventy, covering the reactions most often asked in school-leaving exams (A-level, IB, CBSE, JEE and NEET) and first-year university courses, including condensations, rearrangements, oxidations, reductions and aromatic substitutions.