Method for producing a supported catalyst

Abstract of WO9903581 The invention relates to a method for producing supported catalysts by impregnating or imbibing SiO2-based crystalline or amorphous support material with a pore diameter of 20 to 250 ANGSTROM with silasesquioxane metal complexes. Said supported catalysts are suitable for oxidising or epoxidising unsaturated hydrocarbons or alcohols

The dynamic status quo of polyhedral silsesquioxane coordination chemistry

The chem. of polyhedral oligomeric silsesquioxanes (POSS) has taken a tremendous leap over the past decade. New synthetic approaches have been developed, and new complexes based on elements throughout the periodic table have been synthesized and applied in catalytic processes such as alkene epoxidn., Oppenauer oxidn., alkene polymn., Diels-Alders reactions and alkene metathesis. The use of silsesquioxane ligands as models for silica surface has provided an intimate knowledge of the reactions on the surface of this much-used support. New methods have been developed to incorporate silsesquioxanes into new materials. Encapsulation in siloxane polymers has provided precision supports for catalysts and controlled calcination has produced materials with well-defined metal oxide particles. This paper reviews the history and the latest developments of silsesquioxane chem

Method for producing a supported catalyst

Abstract of WO9903581 The invention relates to a method for producing supported catalysts by impregnating or imbibing SiO2-based crystalline or amorphous support material with a pore diameter of 20 to 250 ANGSTROM with silasesquioxane metal complexes. Said supported catalysts are suitable for oxidising or epoxidising unsaturated hydrocarbons or alcohols

Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex

The reaction of a silsesquioxane trisilanol with methylmagnesium chloride leads to an unprecedented tetranuclear Mg silsesquioxane complex 1 in high yield. The crystal structure shows an unusually short Mg-Cl bond, indicative of an electron-deficient Mg atom. 1 Was used as transmetalation agent for the synthesis of metal silsesquioxane complexes. Transmetalation activity was low, but can easily be followed by multinuclear NMR. Crystal data for 1: C78H142Cl2Mg4O26Si14.6(C4H8O), a 15.744(1), b 26.526(2), c 16.917(1) .ANG., b 113.229(2) Deg, monoclinic, space group P21/n, , Z = 2. [on SciFinder (R)

POSSphites-monophosphites derived from incompletely condensed silsesquioxanes

A straightforward three-step synthetic route is followed to obtain nanostructured silsesquioxane based monophosphite compds. namely POSSphites. These compds., derived from (c-C5H9)7Si7O9(OH)3 and com. available phenol derivs., differ mainly in the steric bulk around the phosphorus atom. Preliminary results in the rhodium-catalyzed hydroformylation of 1-octene exemplify the use of these ligands for homogeneous catalysis. High activities, with a turnover frequency of up to 5000 h-1 were obtained. These ligands are the first silsesquioxane derived monophosphite ligands to be successfully applied in homogeneous catalysis. [on SciFinder (R)