Sandwich‐artige Cyclopentadienylkomplexe von Hauptgruppenelementen

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Abstract
Cyclopentadienyl (Cp) complexes of maingroup elements are classified and compared in terms of structural types, bonding features, and characteristic reactions. Halfsandwich, sandwich and multidecker sandwich arrangements of different type are observed including cluster species with weak or strong metal‐metal bonds. The Cp‐El bonding ranges from mainly covalent to purely ionic with important structure‐determining intermolecular contacts in the latter. π‐Complexation allows the stabilisation of compounds with low‐valent elements such as AI(I), Ga(I), and Si(I1). Important reaction principles and applications are shortly described.