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Keywords:

  • cycloaddition;
  • dienes;
  • homogeneous catalysis;
  • Pauson–Khand reaction;
  • rhodium
Thumbnail image of graphical abstract

The diene plays a key role in the Pauson–Khand [2+2+1] reaction of tethered dienynes (see scheme). These reactions are accelerated by the diene (relative to an alkene) and proceed in good to excellent yields, often at room temperature, in the presence of carbon monoxide, [RhCl(CO)(PPh3)2], and AgSbF6.