Cationic alkylaluminum-complexed zirconocene hydrides as participants in olefin polymerization catalysis

Journal Article (Journal Article)

The alkylaluminum-complexed zirconocene trihydride cation [(SBI)Zr(μ-H) (Al Bu ) ] , which is obtained by reaction of (SBI)ZrCl with [Ph C][B(C F ) ] and excess HAl Bu in toluene solution, catalyzes the formation of isotactic polypropene when exposed to propene at -30 °C. This cation remains the sole observable species in catalyst systems free of AlMe compounds. In the presence of AlMe , however, exposure to propene causes the trihydride cation to be completely converted, under concurrent consumption of all hydride species by propene hydroalumination, to the doubly Me-bridged cation [(SBI)Zr(μ-Me) AlMe ] . The latter then becomes the resting state for further propene polymerization, which produces, by chain transfer to Al, mainly AlMe -capped isotactic polypropene. © 2010 American Chemical Society. 3 2 2 2 3 6 5 4 2 3 2 2 2 i + i +

Full Text

Duke Authors

Cited Authors

  • Baldwin, SM; Bercaw, JE; Brintzinger, HH

Published Date

  • October 13, 2010

Published In

Volume / Issue

  • 132 / 40

Start / End Page

  • 13969 - 13971

Electronic International Standard Serial Number (EISSN)

  • 1520-5126

International Standard Serial Number (ISSN)

  • 0002-7863

Digital Object Identifier (DOI)

  • 10.1021/ja105040r

Citation Source

  • Scopus