FUNCTIONALIZED OCTA-(PROPYLSILSESQUIOXANE S) (3-XC(3)H(6))(8)(SI8O12)- MODEL COMPOUNDS FOR SURFACE-MODIFIED SILICA-GELS

Functionalyzed octa-(propylsilsesquioxanes) [(3-XC(3)H(6))(8)(Si8O12)] have been prepared by the following methods: (a) Hydrolysation of cor responding functionalyzed propyltrialkoxysilanes with X = -Cl, -SH. (b ) Hydrosilylation of allyl compounds of octa-(hydridosilsequinoxans) [ H-8(Si8O12)] with X = -p-(CH3)OC6H4, -C6H5, -OC4H9, -OCH2- [GRAPHICS] -CN, -OSi(CH3)(3), -C6F5, -OC6H5, -SO2C6H5, -Si(CH3)(3). (C) Nucleophi lic substitution of the chlorine atoms of octa-[(3-chloropropyl)-silse squioxane] [(3-ClC3H6)(8)(Si8O12)] with X = -I, -SCN, -P(C6H5)(2), -SC H3. H-1, C-13, Si-29, P-31 NMR, IR, UV/vis und melting point data are reported. The single crystal X-ray structure of (3-IC3H6),(Si8O12) is given.