Extracting agent rare

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PROBLEM TO BE SOLVED : To provide a new rare metal extractant which can extract rare metals, in particularly palladium, with high efficiency. SOLUTION : The rare metal extractant contains a cyclic phenol sulfide derivative expressed by general formula (1), wherein R1, R2and R3respectively and independently denote a hydrogen atom or a 1-10C hydrocarbon group and Z denotes any among a sulfide group, a sulfinyl group and a sulfonyl group. COPYRIGHT : (C)2011, JPO&INPIT