A highly crystalline iodinating reagent,{[K· 18-C-6] ICl2} n, was synthesized in high yield (93%). The trihalide is supported by an 18-crown-6 macrocycle and forms a coordination polymer in the solid state. This reagent iodinates anilines and phenols efficiently under mild conditions. Controlled mono-iodination with anilines was easily achieved while poly- iodination was observed with phenols.
