Synthesis and reactivity of trimethylsilyl substituted mono(cyclopentadienyl)titanium alkyl complexes

J. Sassmannshausen, J. Baumgartner

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1 Citation (Scopus)

Abstract

The preparation of a series of titanium half-sandwich compounds [Ti(η5-C5H5−x (SiMe3) x R3] (x = 1-3, R = Cl, Me) and their reactivity for propene polymerization is reported. The compounds 1-3 polymerize propene, albeit in a much lower activity than the reported [Ti(η5-C5Me5Me3]/B(C6F5)3 catalyst. Unlike the reported [Ti(η5-C5Me5Me3]/B(C6F5)3 catalyst, the quasi living polymerization was not observed. Instead, we observe rather unusual temperature effects when the trityl salt [Ph3C][B(C6F5)4] was used as activator. The activity increases with increasing temperature, whereas when B(C6F5)3 is used a decrease is observed The rather broad (>2) PDI indicates multisite catalysts, and 13C-NMR indicates predominantly atactic polypropene. The solid state structure of the hydrolysis product [{Ti(η5-C5H4(SiMe3)Cl2}O] (4) was determined.
Original languageEnglish
Pages (from-to)676-683
Number of pages7
JournalKinetics and Catalysis
Volume50
Issue number5
DOIs
Publication statusPublished - Sep 2009

Keywords

  • trimethylsilyl
  • mono(cyclopentadienyl)
  • titanium alkyl complexes

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