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Keywords:

  • [2+2+1] cross-cyclotrimerization;
  • alkynes;
  • cyclopentadienyl complexes;
  • fulvenes;
  • rhodium
Thumbnail image of graphical abstract

Three become one: The cationic rhodium(I) complex [Rh(cod)2]BF4 catalyzes the [2+2+1] cross-cyclotrimerization of silylacetylenes and two alkynyl esters, leading to substituted silylfulvenes (see scheme; cod=1,5-cyclooctadiene). The reductive complexation of the silylfulvene product with RhCl3 in EtOH furnished the corresponding dinuclear electron-deficient cyclopentadienyl rhodium(III) complex.