Patent ID: 8853448

Claim:
A method of preparing a sulfonylimide corresponding to the formula (R—SO 2 —N—SO 2 R′] r M (I), said method comprising the steps of: preparing an N-substituted sulfonimide RSO 2 N(R″)SO 2 R′ (II) from RSO 2 F (III); and replacing the R″ group via a nucleophilic substitution reaction in order to obtain the sulfonylimide (I), R″ being a benzyl or trimethylsilyl group, wherein it, in the formulae (I), (II) and (III): R represents a group corresponding to the formula Ar—Z-L-; R′ represents a linear or branched perfluoroalkyl group, preferably a CF 3 or C 2 F 5 group, or an Ar′—Z-L- group; Z represents a sulfide, sulfinyl or sulfonyl group; L represents a group of formula —(CF 2 ) n —CFR f —; n is 0 or 1 R f represents F or a perfluoroalkyl group having from 1 to 8 carbon atoms; Ar and Ar′ when R′ is an Ar′—Z-L- group, each represent an aromatic group chosen from the group constituted by monocyclic aromatic groups; polycyclic aromatic groups having fused or unfused rings; and heterocyclic aromatic groups that are bicyclic with fused or unfused rings or monocyclic; and M is a cation of valence r, chosen from alkali metal, alkaline-earth metal or trivalent or tetravalent metal cations and organic cations chosen from ammonium, phosphonium, imidazolium, guanidinium, piperidinium, pyrrolidinium, pyridinium or quinolinium ions.