Titanium Silsesquioxanes Grafted on Three-Dimensionally Netted Polysiloxanes: Catalytic Ensembles for Epoxidation of Alkenes with Aqueous Hydrogen Peroxide

Selective sulfoxidation with hydrogen peroxide catalysed by a titanium catalyst

“…So far, the use of titanium silsesquioxanes in oxidation reactions has been limited to catalytic epoxidation of olefins. [10][11][12][13][14]…”

Epoxidation with Ti(OSiMe3)4: a homogeneous model mimicking titania–silica mixed oxides?

“…[20][21][22][23] Interestingly, tert-butyl hydroperoxide (TBHP) was used as oxidant as none of these complexes were active with aqueous H 2 O 2 . 24 Grafting a titanium silasesquioxane onto a hydrophobic polysiloxane demonstrated that an ideal model for TS-1 should possess isolated Ti(OSi= =) n (n ¼ 3, 4) sites in a hydrophobic environment. 24 Other limitations of titanium silasesquioxane complexes as soluble, homogeneous model catalysts are the presence of Ti-O-Ti bonds in the structure and slightly distorted tetrahedron bond angles.…”

Cyclopentadienyl–Silsesquioxane Titanium Catalysts: Factors Affecting Their Formation and Activity in Olefin Epoxidation with Aqueous Hydrogen Peroxide

“…Among them, a series of titanium silsesquioxane complexes has been reported to catalyze alkene epoxidation with organic peroxides, showing high activities even superior to those of analogous heterogeneous systems . However, such complexes are not active in reactions with hydrogen peroxide, which constitutes an important drawback for their development as homogeneous oxidation catalysts.…”