Phenylephosphonic acid ester comprising metal extracting

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PROBLEM TO BE SOLVED : To provide a metal extracting agent in which separation coefficient of metals is high and solubility into water is low in solvent extraction for extracting or selectively separating metals especially rare earth metals.SOLUTION : The metal extracting agent comprises phenylphosphonic ester shown by general formula (1) [wherein Ris a hydrocarbon group in which the number of branched carbons is four to 6 the number of total carbons is 16 to 20, Ris a substitutional group selected from a group comprising a hydrogen atom, a halogen atom, and a 1-3C hydrocarbon group, m is a number of one to three (R2 may be the same or different in the case m is two to three), M is a hydrogen atom or an alkaline metal atom].