Half sandwich compound
Class of coordination compounds / From Wikipedia, the free encyclopedia
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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.[1][page needed] 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.
Cp2V2(CO)5 featuring a pair of semi-bridging CO ligands.[2]
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