--- title: "Anti-Markovnikov addition of HBr Template | MolDraw" url: https://www.moldraw.com/templates/radical-hbr-addition/ description: "Anti-Markovnikov addition of HBr template: Peroxide homolysis, Br• formation, Br• addition to propene and H-atom transfer give 1-bromopropane by a chain.…" lang: en publisher: Scidart Academy generated: 2026-10-28 --- [MolDraw](https://www.moldraw.com/) › [Templates](https://www.moldraw.com/templates/) › [Mechanisms](https://www.moldraw.com/templates/mechanisms/) › Anti-Markovnikov addition of HBr [Mechanisms](https://www.moldraw.com/templates/mechanisms/)Premium # Anti-Markovnikov addition of HBr template ![Anti-Markovnikov addition of HBr template: Peroxide homolysis, Br• formation, Br• addition to propene and H-atom transfer give 1-bromopropane by a chain.](https://www.moldraw.com/templates/radical-hbr-addition.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). Peroxide homolysis, Br• formation, Br• addition to propene and H-atom transfer give 1-bromopropane by a chain. ## Mechanism step by step With peroxide, Br• adds first to give the more stable radical: Br ends up on the end carbon 1. **Initiation** – The weak O–O bond breaks evenly 2. **Bromine radical** – RO• takes H from HBr 3. **Propagation 1** – Br• adds to give the 2° radical 4. **Propagation 2** – The radical takes H; Br• carries the chain ## Key points - Fish-hook arrows move one electron each. - Only HBr does this: for HCl and HI one propagation step is too slow. - The secondary radical is more stable, so Br bonds to the terminal carbon. - Termination: any two radicals combine. Drawn with 60 atoms, 16 arrows, 6 shapes – every one editable in MolDraw. ## Sources - [Kharasch & Mayo, J. Am. Chem. Soc. 1933, 55, 2468](https://doi.org/10.1021/ja01333a041) Original paper - [Clayden, Greeves & Warren, Organic Chemistry, 2nd ed., OUP 2012, ch. 37](https://openlibrary.org/isbn/9780199270293) Textbook - [Smith, March's Advanced Organic Chemistry, 8th ed., Wiley 2020](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 Anti-Markovnikov addition of HBr template free? You can preview the Anti-Markovnikov addition of HBr 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 Anti-Markovnikov addition of HBr 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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