Cp-substituent additivity effects controlling the stereochemistry of the propene polymerization reaction at conformationally unrestricted (Cp-CHR1R2) 2ZrCl2/ …

…, R Nolte, R Aul, S Wilker, C Krueger…

Index: Erker, Gerhard; Nolte, Rainer; Aul, Rainer; Wilker, Stephan; Krueger, Carl; Noe, Ralf Journal of the American Chemical Society, 1991 , vol. 113, # 20 p. 7594 - 7602

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Citation Number: 110

Abstract

Abstract: Four chiral bent metallccene complexes (Cp-CHR'R2) 2ZrC12 (1-4, Cp= C5H4) were prepared and used to generate homogeneous Ziegler catalyst systems for the stereoselective polymerization of propene. 6-Cyclohexyl-6-methylfulvene was reduced by intermolecular P-hydride transfer from primary alkyllithium reagents LiCH, CHRR'(6 R, R'= H, alkyl, aryl) to give [Cp-CH (CH,) Cy] Li (7a). Subsequent reaction with zirconium ...