Half sandwich compound

Half sandwich compounds, also known as piano stool complexes, are organometallic complexes that feature a cyclic polyhapto ligand bound to an MLn center, where L is a unidentate ligand. Thousands of such complexes are known. Well-known examples include cyclobutadieneiron tricarbonyl and (C5H5)TiCl3. Commercially useful examples include (C5H5)Co(CO)2, which is used in the synthesis of substituted pyridines, and methylcyclopentadienyl manganese tricarbonyl, an antiknock agent in petrol.

  • MMT is a commercially useful antiknock compound.
  • CpCo(CO)2 is a catalyst for the synthesis of pyridines.
  • (C4H4)Fe(CO)3.
  • CpFe(CO)2I is an example of a piano stool complex with two different monodentate ligands.
  • The diruthenium of cymene is readily cleaved by ligands to give monoRu half-sandwich derivatives.
  • Cycloheptatriene molybdenum tricarbonyl
  • Cp2V2(CO)5 featuring a pair of semi-bridging CO ligands.
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