one aspect of the present invention relates to a method of purifying radiolabelled compounds comprising a ) loading onto a fluorous polymer a radiolabelled compound precursor comprising a fluoroalkyl tin moiety ; b ) reacting the radiolabelled compound precursor with a radiolabel delivering compound to give a radiolabelled compound , wherein the fluoroalkyl tin moiety is replaced by a radiolabel ; and c ) eluting the radiolabelled compound from the fluorous polymer .