THE INVENTION REFERS TO CALIX [4] ARENOS-BIS-CORONAS, ITS PREPARATION PROCESS AND ITS USE FOR THE SELECTIVE EXTRACTION OF CESIUM AND ACTINIDES. THESE CALIX [A] ARENOSBIS-CORONAS RESPOND TO FORMULA (I) IN WHICH R1 AND R2 RESPECTIVELY REPRESENT X (C2H4X) MYX (C2H4X) N WITH X 0 =, NHG Y / ON (CH3), MYN = 3.4 , 5 OX (CH2H4X) P / 2 YX (C2H4Z) P / 2 WITH P = 2 O 4 YY = CYCLOALKYLENE OR ARYLENE. THESE CALIX [4] ARENOSBIS-CORONAS WHOSE NUCLEOUS BENCENICSO ARE EVENTUALLY SUBSTITUTED BY ALKILO GROUPS, MAY BE USED AS AN EXTRACTANT, IN THE FORM OF A LIQUID MEMBERSHIP, WHICH IS TO SEPARATE THE CESIO FROM ACID SATURY FOR EXAMPLE EFFLUENTS FROM IRRADIATED FUEL REPROCESSING FACTORIES
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