ChemInform Abstract: Bicyclo(3.3.1)nonanes as Synthetic Intermediates. Part 15. Ring Enlargement of Bicyclo(3.3.1)nonane‐2,6‐dione and Bicyclo(3.3.1)nonan‐2‐one. Revision of the Literature.

Abstract The main product of the reaction of the bicyclononanedione (I) with diazomethane (II) is shown to be the isotwistane (III) and not the tricyclodecane (VI) as previously published.