Bis(pentamethylcyclopentadienyl)(η3-trimethylenemethane)zirconium: A New Mode of Bonding for the Trimethylenemethane Ligand

Authors

  • Prof. Dr. Gerhard E. Herberich,

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    1. Institut für Anorganische Chemie der Technischen Hochschule Professor-Pirlet Strasse, D-52056 Aachen (FRG) Telefax: Int. code + (241)8888-288
    • Institut für Anorganische Chemie der Technischen Hochschule Professor-Pirlet Strasse, D-52056 Aachen (FRG) Telefax: Int. code + (241)8888-288
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  • Dr. Carsten Kreuder,

    1. Institut für Anorganische Chemie der Technischen Hochschule Professor-Pirlet Strasse, D-52056 Aachen (FRG) Telefax: Int. code + (241)8888-288
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  • Dr. Ulli Englert

    1. Institut für Anorganische Chemie der Technischen Hochschule Professor-Pirlet Strasse, D-52056 Aachen (FRG) Telefax: Int. code + (241)8888-288
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Abstract

original image

A bent metallocene with a side-on η3-bound trimethylenemethane (tmm) ligand is observed in the crystal structure of the title compound 1 (shown on the right). The Zr[BOND]Cl and Zr[BOND]C2 bond lengths indicate that two strong σ bonds link Zr to the terminal C atoms of the tmm ligand. The distance between Zr and the central atom C 3 is typical for a weak σ bond. Reactions of 1 with reagents that contain polar double bonds, for example methyl formate and tert-butyl isocyanate, yield insertion products with six-membered rings.

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