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Issue 8, 2007
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Synthesis and characterization of complexes containing Ti–O–Si moieties. Catalytic activity in olefinepoxidation

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Abstract

Reaction of [Cp*TiMe3] with O(SiPh2OH)2 yields the titanium siloxide derivative [Cp*TiMe{(OSiPh2)2O}] (1). Complex 1 reacts with H2O to yield the corresponding oxo-titanium derivative [(Cp*Ti{(OSiPh2)2O})2(µ-O)] (2). The molecular structure of complex 2 has been established by X-ray diffraction. Complex 1 reacts with triphenylsilanol to give the asymmetric titanium siloxide [Cp*Ti(OSiPh3){(OSiPh2)2O}] (3). Treatment of the dinuclear titanium compound [(Cp*TiCl2)2(µ-O)] with an equimolar amount of O(SiPh2OH)2 yields complex [(Cp*TiCl)2{µ-(OSiPh2)2O}(µ-O)] (4) in which the disiloxide moiety is bridging two titanium atoms. The structure of 4 has been determined by X-ray diffraction. Reaction of [Cp*TiMe3] with HOSiPh3 yields the titanium triphenylsiloxide [Cp*TiMe2(OSiPh3)] (5). Complex 5 reacts with water to yield [{Cp*TiMe(OSiPh3)}2(µ-O)] (6). The triflate compound [Cp*Ti(OSiPh3)2(OTf)] (7) can be prepared by reaction of 5 with HOTf and triphenylsilanol. We have tested the catalytic activity of some of the complexes in the epoxidation of cyclohexene.

Graphical abstract: Synthesis and characterization of complexes containing Ti–O–Si moieties. Catalytic activity in olefin epoxidation

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Supplementary files

Article information


Submitted
03 Nov 2006
Accepted
02 Jan 2007
First published
10 Jan 2007

Dalton Trans., 2007, 871-877
Article type
Paper

Synthesis and characterization of complexes containing Ti–O–Si moieties. Catalytic activity in olefin epoxidation

R. Fandos, B. Gallego, A. Otero, A. Rodríguez, M. J. Ruiz and P. Terreros, Dalton Trans., 2007, 871 DOI: 10.1039/B616064F

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