1,13-Dichloro-4,7,10-trioxatridecane (2-[2-(1-chloro-2-ethoxy)ethoxy] ethyl chloride) (3a) was synthesized by a chlorination of 1,13-dihydroxy-4,7,10-trioxatridecane (triethylene glycol). And it was treated with imidazole and sodium ethoxide to give the 1N,1N'-tris(oxoethylene)-diimidazole (3b), which was then converted to ionic liquid-type crown ether (ILCE) 3 with a reaction with 1,9-dichloro-3,6-trioxaoctane (2a). Further, the anion of ILCE was exchanged by an anion-exchange method. Ultimately, we developed a very efficient synthetic pathway for ILCEs 1-4 which have various physical and chemical characteristics by a modification of the polyethylene Glycol chain length and anions. Sr-85(2+) was successfully extracted into the [(3,2)O(Et)Im][Cl] (3) phase, but it was not extracted into the [(2,2)O(Et)Im][Cl] (1), [(3,3)O(Et)Im][Cl] (2), and [(4,3)O(Et)Im][Cl] (4) phases.