Synthesis and reactivity of functionalized cycloheptatrienyl–cyclopentadienyl sandwich complexes
Literature Information
This feature article provides an overview of the synthesis and reactivity of functionalized cycloheptatrienyl–cyclopentadienyl transition metal sandwich complexes of the type [(η7-C7H7)M(η5-C5H5)] (M = group 4, 5 or 6 metal), which can be used as building blocks for the preparation of metallopolymers and polymetallic complexes. Emphasis is placed on 16-electron group 4 complexes (M = Ti, Zr, Hf) and their reactivity towards σ-donor/π-acceptor ligands, which indicates that these complexes bear a close resemblance to Lewis acidic M+IV complexes. Based on theoretical calculations, this behavior can be mainly attributed to the strong and appreciably covalent metal–cycloheptatrienyl interaction with the cycloheptatrienyl ring acting more as a −3 ligand than as a +1 ligand in these mixed ring complexes.
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