Abstract: N,N-disubstituted sulfonamide between sulfonyl chlorides and tertiary amines was discovered. Four aromatic sulfonamides were synthesized in dichloromethane or acetone by using 4,6-dialkoxy-benzene-1,3-disulfonyl dichlorides and 2,4,6-tris（dimethylaminomethyl）phenol as the starting materials. The purified products were characterized by IR, 1H NMR, elemental analysis and MS. Aromatic sulfonamides were then applied as the extraction reagents for Ca2+, Pb2+ and some transition metal cations. The primary results showed that the aromatic sulfonamides have better extraction capability for Ca2+.

Key words: selective extraction, sulfonamide, synthesis, dialkoxybenzene disulfonic acid bis-dialkylamide