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Published September 3, 2001 | Supplemental Material
Journal Article Open

Thermally Stable Dialkylzirconocenes with β-Hydrogens. Synthesis and Diastereoselectivity


Alkylation of Cp^r_2ZrCl_2 (Cpr = Cp (η^5-C_5H_5), Cp' (η^5-C_5H_4Me), Cp^* (η^5-C_5Me_5)) and CpCp^*Zr(CH_3)Cl with 1-lithio-2-methylpentane (R^1Li) gives the corresponding dialkylzirconocenes Cp^r_2ZrR^1_2 and CpCp^*Zr(CH_3)R^1, in high yields. Such alkyls have unprecedented thermal stabilities, especially for the CpCp^* ligand framework. The diastereomers of the Cp^r_2ZrR^1_2 complexes are formed in a statistical distribution, whereas the diastereomers of CpCp^*Zr(CH_3)R^1 form in a 2:3 ratio.

Additional Information

© 2001 American Chemical Society. Received 9 April 2001. Published online 8 August 2001. Published in print 1 September 2001. This work has been supported by the USDOE Office of Basic Energy Sciences (Grant No. DE-FG03-85ER13431) and ExxonMobil Chemical Co. O.F.W. thanks The Wenner-Gren Foundations, The Fulbright Commission, and The Royal Physiographic Society in Lund, Sweden, for postdoctoral fellowships.

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