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

J. Sassmannshausen; J. Baumgartner

doi:10.1134/S0023158409050097

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

J. Sassmannshausen, J. Baumgartner

Pure And Applied Chemistry

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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 language	English
Pages (from-to)	676-683
Number of pages	7
Journal	Kinetics and Catalysis
Volume	50
Issue number	5
DOIs	https://doi.org/10.1134/S0023158409050097
Publication status	Published - Sept 2009

Keywords

trimethylsilyl
mono(cyclopentadienyl)
titanium alkyl complexes

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10.1134/S0023158409050097

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title = "Synthesis and reactivity of trimethylsilyl substituted mono(cyclopentadienyl)titanium alkyl complexes",

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.",

keywords = "trimethylsilyl, mono(cyclopentadienyl), titanium alkyl complexes",

author = "J. Sassmannshausen and J. Baumgartner",

year = "2009",

month = sep,

doi = "10.1134/S0023158409050097",

language = "English",

volume = "50",

pages = "676--683",

journal = "Kinetics and Catalysis",

issn = "0023-1584",

publisher = "Maik Nauka Publishing / Springer SBM",

number = "5",

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TY - JOUR

T1 - Synthesis and reactivity of trimethylsilyl substituted mono(cyclopentadienyl)titanium alkyl complexes

AU - Sassmannshausen, J.

AU - Baumgartner, J.

PY - 2009/9

Y1 - 2009/9

N2 - 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.

AB - 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.

KW - trimethylsilyl

KW - mono(cyclopentadienyl)

KW - titanium alkyl complexes

UR - http://dx.doi.org/10.1134/S0023158409050097

U2 - 10.1134/S0023158409050097

DO - 10.1134/S0023158409050097

M3 - Article

SN - 0023-1584

VL - 50

SP - 676

EP - 683

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

IS - 5

ER -

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

Abstract

Keywords

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