Journal of Organometallic Chemistry p. 13 - 22 (1996)
Update date:2022-08-03
Topics:
Walther
Fischer
Goerls
Koch
Schweder
Organometallic compounds of the type (Siam)2ZrX2 (Siam = N,N′-bis(trimethylsilyl)benzamidinat; X = methyl, benzyl or allyl) have been synthesized by reaction of (Siam)2ZrCl2 and Grignard reagents. The structures of (Siam)2ZrX2 (X = Cl, I, CH3 or CH2-C6H5) and (Siam)3ZrCl have been investigated by X-ray crystal structure analysis. (Siam)3ZrCl shows a capped octahedral structure with the coordination number 7 at the zirconium. (Siam)2ZrX2 compounds have distorted octahedral structures and the ligands occupy cis-positions. The distortion depends on the bulkiness of the ligand X. The systems (Siam)2ZrCl2-methylalumoxan (MAO) and (Siam)3ZrCl-MAO polymerize at 30°C reactive olefins such as ethylene or norbornene. Less reactive olefins (e.g. propene) can be reacted with (Siam)ZrCl3-MAO to yield oligomers and polymers. The same catalytic system is able to convert 1,5-hexadiene selectively under formation of methylene-cyclopentane.
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