Preliminary communicationUnsymmetrical ansa-metallocenes of zirconium and hafnium

Add time:09/03/2019    Source:sciencedirect.com

Tetrakis(dimethylamino)zirconium (3a) and -hafnium (3b) react with cyclopentadiene-indene ligand precursors to form new η5 : η5-metallocenes1c,d of the amido-type. A cyclopentadiene-fluorene ligand eliminates only one amide ligand from 3a to yield a tris(amide) complex 5, with the fluorenyl ligand not coordinating to the metal.

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