Athanor by arbastro
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How to make a double or triple bond

With the Bond tool, click an existing bond to raise its order (single, double, triple); Alt+click goes back. Or point at the bond and press 2 for double or 3 for triple.

Steps

  1. Draw the structure, for example propane: a chain of three carbons.

    Propane, a three-carbon chain, before the change.Propane, a three-carbon chain, before the change.

  2. With the Bond tool on (D), click the bond you want to change. Each click raises its order: single, then double, then triple. Alt and click goes back one step.

    The first bond raised to a double bond, making propene.The first bond raised to a double bond, making propene.

With the keyboard

Point at a bond and press 1, 2 or 3 for a single, double or triple bond. This works with any tool, so you never have to leave the one you are using.

To draw new bonds that start out double or triple, pick double (2) or triple (3) in the row above the toolbar before you click.

Note

Athanor keeps count of each atom's bonds. Raise a bond on a carbon that already has four, and the issues badge at the bottom left of the canvas flags it.

Drawing basicsHow to add ringsPress R, then J for benzene or 3 to 8 for that ring size, and click empty canvas. Click a bond of another ring to fuse onto it, or an atom to make a spiro ring. Insert › Ring size takes any size from 3 to 30.Keyboard shortcutsKeyboard shortcutsPress ? in a document for the Controls cheat sheet, or Ctrl+K and search for a command to see its shortcut. Every shortcut can be changed in Settings › Shortcuts. On a Mac, Ctrl is Cmd.

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Last updated Nov 12, 2026