Soluble fulleropyrrolidines bearing a trialkoxysilyl functionality (methoxy, ethoxy, butoxy, and isopropoxy) have been prepared and characterized. The hydrolysisrate constant for each fulleropyrrolidine was measured with 1H NMR spectroscopy by following the disappearance of selected resonances of the fullerene substrate under the conditions (HCl/H2O/THF) used for the preparation of fullerene-doped