There is a review of ChemDraw 16 over on Chemistry and Computers.

A key feature is found-trip editing, wherein a user could make a drawing in one application, copy and paste the drawing into another application, and then later copy and paste back into the original application, and still be able to edit the drawing. Generations of Mac users relied on this feature to go from applications like ChemDraw into PowerPoint and back again. This has been has been regularly broken as we had various updates to Mac oSX, Microsoft Office, iWork and ChemDraw. It sounds like some interoperability has returned but it may depend on which versions of the various components you are running.

Now updated to include Mac OSX Sierra, ChemDraw 16 works and round-trip editing using Word 2011 still works! Unfortunately round-trip editing appears to be broken in Pages, Keynote and Numbers.