As per the document “Graphical Representation Standards for Chemical Structure Diagrams”, (IUPAC, Pure and Applied Chemistry 80, 277–410)
section GR-6, there exisits a shorthand that indicates all resonance forms of a delocalised system by a curve or circle.
I'm wondering if there is a method or an implimentation for draying such curved delocalised bonds within Chemdraw 15.1 (or earlier). In particular I'm interested in complex curves and non-closed curves, for example, such as those that might be used in to depict bridged bicylics molecules or the allyl radical. (The middle and right-most figures in the image. From the above guidelines, section GR-6.1, p 380.)
I'm currently using straight, dashed bonds in my structures, but the IUPAC guidelines state that they should be solid. If a nice, clean method doesn't exist I'd like to make a feature request for this, as it is IUPAC recommended for structures. Any sort of help would be much appreciated.