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Please login to access the full content or check if you have access via2.11.5 Product Subclass 5: Five-Membered Metallocycle–Bis(η5-cyclopentadienyl) Derivatives of Oxidation State Four
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Negishi, E.-i.; Takahashi, T., Science of Synthesis, (2003) 2, 739.
Five-membered zirconocene and hafnocene derivatives formally belong in Section 2.11.4. Due to their special scientific and synthetic significance, however, these compounds and their three-membered counterparts are separately classified. The latter compounds are often considered as η2-complexes of bis(η5-cyclopentadienyl)zirconium(II) and -hafnium(II) and they are discussed in Section 2.11.8. Five-membered zirconocene and hafnocene derivatives such as metallacyclopentanes, metallacyclopentenes, and metallacyclopentadienes may contain one or more heteroatoms in the ring moiety (Scheme 74). Five-membered zirconacycles are frequently found as intermediates in bis(η5-cyclopentadienyl)zirconium(II)-catalyzed C—C bond forming reactions; the catalytic reactions of zirconium(II) complexes are discussed in Section 2.11.8.
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