Methods have been developed for the preparation of 2-(2 (RS)-aminopropyl)-5- iodothiophenes. The syntheses and physical propertie8 of 2-(2 (RS)-aminopropyl)- &iodothiophene and N-is0propyl-2-(2 (RS)-aminopropyl)-&idothiophene are described. The radioiodinated agents are of interest because of the high expected uptake and prolonged brain retention that may result from binding to high-capacity, relatively nonspecific amine ...