An Efficient and simple method for the diazotization of a wide range of aryl amines has been developed by using a polymer-supported sodium nitrite. The diazotization of aryl amines occurred with crosslinked poly(4-vinylpyridine)-supported sodium nitrite, in the presence of concentrated H(2)SO(4), at low temperature (0-5 degrees C). The obtained diazonium salt, followed by treatment with KI in water at room temperature or at 60 degrees C to produce a various of aryl iodides. The spent polymeric reagent can be regenerated and reused for several times without losing its activity. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 2621-2625, 2011