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Keywords:

  • carbenes;
  • cyclopropenylidenes;
  • fulvalenes;
  • hydration;
  • strained molecules
Thumbnail image of graphical abstract

Small and stable: A triafulvalene derivative is indefinitely stable at room temperature both in solution and in the solid state under inert atmosphere. The triafulvalene is synthesized by the magnesium-catalyzed coupling of two bis(chlorocyclopropenyl) derivatives. The two unsaturated three-membered rings are linked together by a carbon–carbon double bond (1.303 Å, see structure), which is so reactive that spontaneous addition of water occurs at room temperature.