15 research outputs found
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
Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex
Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex
Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex
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)