SYNTHESIS OF POROUS SILICA-GEL FROM ORGAN OSTANNIO DERIVATIVES OF SILICIC-ACID

Amorphous porous silica gels were prepared from organostannio derivati ves of silicic acid. The treatment of tributylstannio ester of silicic acid with nitric acid afforded the silica gel with the elimination of tributylstannio moiety. It showed a relatively high distribution of 3 .4 nm pores. Tributylstannio and dibutylstannio silica gels were analo gously demonstrated to be useful precursors for the preparation of por ous silica gels. The observed surface areas of these silica gels were in the range from 500 m(2)/g-600 m(2)/g.