Sassmannshausen, J and Baumgartner, J (2009) Synthesis and Reactivity of Trimethylsilyl Substituted Mono(cyclopentadienyl)titanium Alkyl Complexes. KINET CATAL+ , 50 (5) 676 - 683. 10.1134/S0023158409050097.
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Abstract
The preparation of a series of titanium half-sandwich compounds [Ti(eta(5)-C5H5-x(SiMe3)(x)R-3] (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(eta(5)-C5Me5Me3]/B(C6F5)(3) catalyst. Unlike the reported [Ti(eta(5)-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 C-13-NMR indicates predominantly atactic polypropene. The solid state structure of the hydrolysis product [{Ti(eta(5)-C5H4(SiMe3)Cl-2}O] (4) was determined.
| Type: | Article |
|---|---|
| Title: | Synthesis and Reactivity of Trimethylsilyl Substituted Mono(cyclopentadienyl)titanium Alkyl Complexes |
| DOI: | 10.1134/S0023158409050097 |
| Keywords: | OLEFIN POLYMERIZATION CATALYSTS, CATIONIC ZIRCONOCENE COMPLEXES, HALF-SANDWICH COMPLEXES, METALLOCENIUM ION-PAIRS, CRYSTAL-STRUCTURE, ACTIVATION PROCESSES, PHENYL COORDINATION, BENZYL COMPOUNDS, ARENE COMPLEXES, BOND ACTIVATION |
| UCL classification: | UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry |
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