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Keywords:

  • alkylidynes;
  • alkyne metathesis;
  • cyclooligomerization;
  • homogeneous catalysis;
  • podand ligands
Thumbnail image of graphical abstract

Podand prevents polymers: The molybdenum(VI) propylidyne catalyst 1 with a podand triphenolamine ligand shows high activity in the metathesis of a variety of alkyne substrates, including heterocycles that contain donor moieties. With one substrate-binding site blocked by the multidentate ligand, the undesired polymerization of small alkynes that occurs with non-podand-ligand complex 2 is completely inhibited.