Abstract Aromatic compounds, iodine, and oxygen react in the vapor phase over basic faujasite zeolites at 225-350 C to produce iodoaromatic compounds and water. When the aromatic compound is naphthalene and the reaction is conducted in the region of 250 C over KX zeolite, a shape-selective catalytic oxyiodination occurs, resulting in predominant iodination at the 2-position of naphthalene. Typical product mixtures contain ...