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

Abstract

Katalytische Ensembles für die Alkenepoxidierung mit wässrigem Wasserstoffperoxid sind nun zugänglich. Die Herstellung solcher Systeme gelingt durch Pfropfung robuster Titansilsesquioxan‐Aktivzentren an Dimethylsiloxanpolymere (siehe Bild) und nachfolgende Quervernetzung zu dreidimensionalen Polymeren.

Hydrophobisation of mesoporous γ-Al2O3 with organochlorosilanes—efficiency and structure

“…[21]. In selected systems, catalyst activity can be enhanced by hydrophobisation of the surface [22,23]. Few studies, however, exist on preservation of the structure [24,25], especially for alumina.…”

Titanosilsesquioxanes Embedded in Synthetic Clay as a Hybrid Material for Polymer Science

“…[1][2][3] Metal centers in their silica framework show catalytic properties, [4][5][6] and POSS cages have been used as building blocks for multifunctional composite solids [7,8] and for hierarchical inorganic/organic hybrid architectures. [9][10][11] This success is due to the versatility of these compounds, which may include almost inert hydrocarbon moieties (R), reactive groups, and metal centers, which can be exploited to catalyze different organic reactions, in the same skeleton (Figure 1).…”

“…The combination of these three components provides a very large number of units suitable for "Lego" chemistry, which may lead to functional hybrid materials with ordered arrays of pores if functional groups capable of polymeric reactions are present in the cage. [10] Moreover, POSS-based compounds can be embedded into porous [11] or layered [12,13] inorganic matrices to give a large number of inorganic/organic hybrids or composite materials. For example, the intercalation of NH 2 POSS on montmorillonite provided hybrid additives used for polystyrene nanocomposites.…”

Titanosilsesquioxanes Embedded in Synthetic Clay as a Hybrid Material for Polymer Science

“…The combination of these three components provides a very large number of units suitable for “Lego” chemistry, which may lead to functional hybrid materials with ordered arrays of pores if functional groups capable of polymeric reactions are present in the cage 10. Moreover, POSS‐based compounds can be embedded into porous11 or layered12, 13 inorganic matrices to give a large number of inorganic/organic hybrids or composite materials.…”