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Keywords:

  • C[BOND]C activation;
  • carbonylation;
  • cycloaddition;
  • cyclobutanes;
  • rhodium
Thumbnail image of graphical abstract

Ever expanding: A RhI-catalyzed C[BOND]C activation reaction of allenylcyclobutanes generates intermediate metallacycles that can be trapped with CO to produce a new [6+1] reaction. Functionalized monocyclic and bicyclic cycloheptenones are obtained in good-to-excellent yields with this [6+1] higher-order carbonylative cycloaddition reaction.