Korea Atomic Energy Research Institute

Korea Electric Power Corporation

Jong Kook Kim

Hyun Soo Park

Kune Woo Lee

Jong Seung Kim

Wang Kyu Choi

Moon Hwan Cho

Won Zin Oh

Novel calix[4]arene dibenzo crown ethers useful to selectively extract cesium are represented by the formula: wherein R is a C.sub.1 -C.sub.10 normal alkyl, a phenyl or a methoxyphenyl, R' is hydrogen, p-tert-butyl or a C.sub.1 -C.sub.10 normal alkyl, R' is a C.sub.1 -C.sub.10 normal alkyl, and n is an integer of 0-2. The novel compound is prepared at high yields by introduction of benzene rings into the crown ether ring of calix[4]arene crown-6-ether. The calix[4]arene dibenzo crown ethers are superior in selective absorptivity for cesium ions by virtue of their 1,3-alternate conformational structure and thus, can be used as selective extractants able to separate cesium ions at a high efficiency.

Calix[4 ]arene dibenzo crown ethers, their preparation process and their

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Chooncheongnam-do, South Korea

Jong Kook Kim