Alkyl exchange between aluminum trialkyls and zirconocene dichloride complexes : a measure of electron densities at the Zr center
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Equilibrium constants have been determined for the formation of 15 different zirconocene monomethyl monochloro complexes from the respective dichloride complexes and Al2(CH3)6. The results indicate that the tendency of a particular zirconocene complex to exchange a chloride against a methyl ligand is a measure for the electron deficiency at its Zr center. The results indicate particularly low electron densities for complexes with indenyl instead of cyclopentadienyl ligands, especially for those containing a dimethylsilyl bridge. Only one methyl group is transferred to a zirconocene dichloride even by a large excess of Al2(CH3)6, while the uptake of two alkyl groups, followed by alkane evolution, is observed with triethyl and triisobutyl aluminum.
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BECK, Stefan, Hans-Herbert BRINTZINGER, 1998. Alkyl exchange between aluminum trialkyls and zirconocene dichloride complexes : a measure of electron densities at the Zr center. In: Inorganica Chimica Acta. 1998, 270(1-2), pp. 376-381. ISSN 0020-1693. Available under: doi: 10.1016/S0020-1693(97)05871-4BibTex
@article{Beck1998Alkyl-23879, year={1998}, doi={10.1016/S0020-1693(97)05871-4}, title={Alkyl exchange between aluminum trialkyls and zirconocene dichloride complexes : a measure of electron densities at the Zr center}, number={1-2}, volume={270}, issn={0020-1693}, journal={Inorganica Chimica Acta}, pages={376--381}, author={Beck, Stefan and Brintzinger, Hans-Herbert} }
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