convenient synthesis of ω-iodoaliphatic carboxylic acids and esters by the reaction of cyclicketones with iodine and hydrogen peroxide in the presence of catalytic CuCl has been developed. ω-Iodoaliphatic carboxylic esters were further used for the efficient preparation of di(2-pyridylmethylamino)alkanoic acids in excellent yields. A simple and convenient synthesis of ω-iodoaliphatic carboxylic acids and