PREPARATION, CHARACTERISATION AND APPLICATION OF POLYAMINE-SILICA HYBRIDS IN THE EPOXIDATION OF a ,b -UNSATURATED OLEFINS
AbstractPolyamine-silica hybrids were prepared by a one-pot sol-gel method via a neutral amine templating route. At low loadings (ca. 1 mmol organic group per g of silica) the resultant materials displayed properties typical of M41S-type materials, namely, high surface area (typically 600 m2 g-1) and controlled porosity with an average pore diameter of 3.6 nm. However, the materials were amorphous at loading above 1.2 mmol organic group per g of silica. The materials were used as heterogeneous base catalysts in the epoxidation of electron deficient olefins. The yields of the epoxide product ranged between 52% and 76%, depending on the loading of the catalytic group.
(Received October 10, 2001; revised February 28, 2001)
Bull. Chem. Soc. Ethiop. 2002, 16(1), 103-112