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Keywords:

  • cycloadditions;
  • cyclooctatetraenes;
  • diynes;
  • homogeneous catalysis;
  • oxazoline ligands
Thumbnail image of graphical abstract

All-kynes of COTs: A Ni0-catalyzed [2+2+2+2] cycloaddition of 1,6-diynes yields highly functionalized hexa- and octa-substituted cyclooctatetraenes (COTs; see picture) along with the first example of a fully intramolecular [2+2+2+2] cycloaddition product. The regioselectivity of this process is studied and the initial use of COT ligands is shown in the formation of a ZnII complex with a bis(oxazoline) COT.