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

Determination of the Young's modulus of silica aerogels – an analytical–numerical approach

“…For example, at a low density, the extraordinarily large surface area results in silica aerogels being highly effective catalysts. 4 On the other hand, silica aerogels can be brittle materials, 5,6 and their strength decreases with decreasing density, 7,8 leading to limited applications of silica aerogels in structural components. To design better functional materials with silica aerogels and to realize the potential applications as structural components, it is imperative to understand the mechanical properties of silica aerogels.…”

Interaction of Water, Alkyl Hydroperoxide, and Allylic Alcohol with a Single-Site Homogeneous Ti−Si Epoxidation Catalyst: A Spectroscopic and Computational Study

“…28 Recently, tetrakis(trimethylsiloxy)titanium (TTMST, Ti(O-SiMe 3 ) 4 ) was suggested to be a good soluble homogeneous model catalyst mimicking the highly active isolated tetrahedral Ti sites in silylated titania-silica mixed oxides. 29 Although a similar catalyst, Ti(OSiPh 3 ) 4 , is inactive in epoxidation, 30 TTMST shows excellent catalytic properties with various olefins and especially gives 100% regio-and stereoselectivity for geraniol and 2-cyclohexen-1-ol (CHol, cyclohexenol) using TBHP as oxidant in an apolar solvent. Addition of water to the TTMST catalytic system has negative effects on the epoxidation activity and selectivity as similarly reported for titania-silica mixed oxides.…”

Recent Developments in the Chemistry of Molecular Titanosiloxanes and Titanophosphonates

“…On the other hand, the molecule Ti(OSiMe 3 ) 4 (4) is tested as simple and commercially available model compound for stable and isolated tetrahedral Ti site surrounded by four siloxy groups (Scheme 6) (Beck et al, 2003). This compound seems to be a particularly attractive model of silylated titania-silica.…”