Materials and methods
All the reagents and solvents were used as receivedwithout further purification. Before functionalizationthe siliceous supports were dried at 200 °C for 5 hours.The amorphous silica used was the commercial Kieselgel 60(KG-60) purchased from Merck.Gas-chromatographic analysis were accomplished on aTrace GC Thermo Finnigan instrument with a fused silicacapillary column SPB-20 from Supelco (30 x 0,25 mm).N2 adsorption-desorption isotherms were obtained at 77 K ona Micromeritics Pulse chemiSorb 2705, were used to determinespecific surface areas SABET. ...