The metal salt (Perfluoropolyalkyl fluoroalkylsulfonyl) trisphenols methide

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PROBLEM TO BE SOLVED : To provide a new tris(perfluoroalkylsulfonyl)methide metal salt capable of being used as a highly active Lewis acid catalyst in the reactions of nucleophilic reagents. SOLUTION : A compound of the formula [(RfSO2)3C]nM1 [Rf is a >=1C perfluoroalkyl; M1 is an element selected from transition metals including rare earth metals, cadmium, gallium, indium, thallium, silicon, germanium, tin, lead, arsenic, antimony, bismuth, selenium, and tellurium; and (n) is the same integer as the atomic valency of M1]. For example, tris(trifluoromethanesulfonyl)methide ytterbium salt. The compound of the formula is obtained by adding tris(trifluoromethanesulfonyl)methide to water and further adding ytterbium carbonate to the solution with stirring. It is preferable that an acid catalyst is prepared from a compound of the formula : [(RfSO2)3C]nM2 [M2 is an alkali metal, a transition metal including a rare earth element or the like; and (n) is the same integer as the atomic valency of M2].