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Half sandwich compound : ウィキペディア英語版
Half sandwich compound
Half sandwich compounds 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.〔Elschenbroich, C. ”Organometallics” (2006) Wiley-VCH: Weinheim. ISBN 978-3-527-29390-2〕 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-2D-skeletal.png|MMT is a commercially useful antiknock compound.
Cpco(CO)2.png|CpCo(CO)2 is a catalyst for the synthesis of pyridines.
Cyclobutadienyl-iron-tricarbonyl-from-xtal-3D-balls.png|(C4H4)Fe(CO)3.
Cp2Fe(CO)2I-2D-skeletal.png|CpFe(CO)2I is an example of an unsymmetrical piano stool complex.
RuCymCl2.png|The diruthenium of cymene is readily cleaved by ligands to give monoRu half-sandwich derivatives.

==(η5-C5H5) piano stool compounds==
Half sandwich complexes containing cyclopentadienyl ligands are common. Well studied examples include (η5-C5H5)V(CO)4, (η5-C5H5)Cr(CO)3H, (η5-C5H5)Mn(CO)3, (η5-C5H5)Cr(CO)3H, ()+, (η5-C5H5)V(CO)4I, (η5-C5H5)Co(CO)2.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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