Soluble fulleropyrrolidines bearing a trialkoxysilyl functionality (methoxy, ethoxy, butoxy, and isopropoxy) have been prepared and characterized. The hydrolysis rate constant for each fulleropyrrolidine was measured with 1 H NMR spectroscopy by following the disappearance of selected resonances of the fullerene substrate under the conditions (HCl/ H 2 O/THF) used for the preparation of fullerene-doped solgel glasses. It has been found that fulleropyrrolidine 1, bear-