title: Synthesis and characterization of complexes containing Ti-O-Si moieties. Catalytic activity in olefin epoxidation.
abstract: Reaction of [Cp*TiMe3] with O(SiPh2OH)2 yields the titanium siloxide derivative [Cp*TiMe{(OSiPh2)2O}]. Complex reacts with H2O to yield the corresponding oxo-titanium derivative [(Cp*Ti{(OSiPh2)2O})2(micro-O)]. The molecular structure of complex has been established by X-ray diffraction. Complex reacts with triphenylsilanol to give the asymmetric titanium siloxide [Cp*Ti(OSiPh3){(OSiPh2)2O}]. Treatment of the dinuclear titanium compound [(Cp*TiCl2)2(micro-O)] with an equimolar amount of O(SiPh2OH)2 yields complex [(Cp*TiCl)2{micro-(OSiPh2)2O}(micro-O)] in which the disiloxide moiety is bridging two titanium atoms. The structure of has been determined by X-ray diffraction. Reaction of [Cp*TiMe3] with HOSiPh3 yields the titanium triphenylsiloxide [Cp*TiMe2(OSiPh3)]. Complex reacts with water to yield [{Cp*TiMe(OSiPh3)}2(micro-O)]. The triflate compound [Cp*Ti(OSiPh3)2(OTf)] can be prepared by reaction of with HOTf and triphenylsilanol. We have tested the catalytic activity of some of the complexes in the epoxidation of cyclohexene.
authors.affiliation: Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Campus de Toledo, Avda. Carlos III, s/n, 45073, Toledo, Spain.
authors.forename: Rosa
authors.initials: R
authors.lastname: Fandos
authors.forename: Beatriz
authors.initials: B
authors.lastname: Gallego
authors.forename: Antonio
authors.initials: A
authors.lastname: Otero
authors.forename: Ana
authors.initials: A
authors.lastname: Rodríguez
authors.forename: María José
authors.initials: MJ
authors.lastname: Ruiz
authors.forename: Pilar
authors.initials: P
authors.lastname: Terreros