---
title: "Halohydrin formation Template – Chemistry Diagram | MolDraw"
url: https://www.moldraw.com/templates/halohydrin-formation/
description: "Halohydrin formation template: Propene and Br₂ in water form a bromonium ion; water attacks the more substituted carbon (anti) and loses H⁺ to give…"
lang: en
publisher: Scidart Academy
generated: 2026-11-13
---
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# Halohydrin formation template

![Halohydrin formation template: Propene and Br₂ in water form a bromonium ion; water attacks the more substituted carbon (anti) and loses H⁺ to give 1-bromopropan-2-ol.](https://www.moldraw.com/templates/halohydrin-formation.webp)

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Propene and Br₂ in water form a bromonium ion; water attacks the more substituted carbon (anti) and loses H⁺ to give 1-bromopropan-2-ol.

## Mechanism step by step

Bromine water: water, not bromide, opens the bromonium ion at the more substituted carbon

1. **Bromonium ion** – The π bond attacks Br; Br closes the three-membered ring
2. **Water opens the ring** – Anti attack at the more substituted carbon
3. **Deprotonation** – Water removes H⁺ from the oxonium ion

## Key points

- Water is in huge excess, so it beats Br⁻ to the bromonium ion (only a little 1,2-dibromide forms).
- Markovnikov-like: the more substituted carbon carries more δ+ in the bromonium ion, so OH ends up there.
- Anti addition: cyclohexene gives trans-2-bromocyclohexanol.
- Base closes a halohydrin to an epoxide (intramolecular Williamson).

Drawn with 44 atoms, 11 arrows, 7 shapes – every one editable in MolDraw.

## Sources

- [Clayden, Greeves & Warren, Organic Chemistry, 2nd ed., OUP 2012, ch. 19](https://openlibrary.org/isbn/9780199270293) Textbook
- [Smith, March's Advanced Organic Chemistry, 8th ed., Wiley 2020, ch. 15](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.
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3. Add your own structures, arrows and text next to it, or combine several templates on one page.
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## Frequently asked questions

### Is the Halohydrin formation template free?

You can preview the Halohydrin formation 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 Halohydrin formation 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. You can open it in MolDraw, change the substrate and reuse it.

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