ChemDraw User's Manual - CambridgeSoft

If you click an atom in a ring, a spiro linkage isformed.A circle appears inside the ring.Drawing Cyclohexane ChairRingsYou can draw Cyclohexane chair rings in twoorientations: horizontal and vertical.When youdraw a cyclohexane chair ring by clicking, the chairis drawn in a horizontal orientation.To orient a cyclohexane chair ring to a verticalorientation:1. Click one of the Cyclohexane Chair Ring tools.2. Drag in the structure to the orientation youwant.Horizontal OrientationDrawing ResonanceDelocalized RingsVertical OrientationAny of the ring tools, except the cyclohexane chairs,can be drawn in a resonance delocalized form.NOTE: The circle is automatically grouped with the ringwhen drawn. For more information on grouping objects, see“Grouping Objects” on page 118.Drawing Cyclopentadieneand Benzene RingsThe double bonds in the cyclopentadiene orbenzene ring tools can be drawn in either of twoforms.When you draw a cyclopentadiene or benzene ringa double bond is drawn first. The Cyclopentadieneand Benzene Ring tool pointers indicate thisorientation.To shift the orientation so the first bond drawn is asingle bond, do one of the following:• Shift+drag from the beginning of the firstsingle bond to the end of the single bond.• Shift+click in a document window to draw thebond with a Fixed Length.In the figure below, the arrow indicates thedirection in which the first bond is drawn.To draw a resonance delocalized ring:1. Click a ring tool.2. Press the Ctrl or Command key and drag orclick to draw the ring.ChemDraw 9 Drawing Chemical Structures • 67Drawing Rings