| 摘要 |
The arylsulfonylureide compound which is of value as a color developer is provided in high yield and high purity by a simple procedure. The technology of the invention for producing an arylsulfonylureide compound of general formula (1)(Ar1-SO2NHCONH)n-Ar2(1)wherein Ar1 represents an aromatic residue; Ar2 represents a bivalent or trivalent aromatic residue; n represents an integer of 2 or 3 comprises reacting an arylsulfonamide alkali metal salt of general formula (2)Ar1-SO2NH.B(2)wherein B represents an alkali metal with an aromatic isocyanate compound of general formula (3)Ar2-(NCO)n(3)in at least one solvent selected from the class consisting of acetonitrile, acetone, methyl ethyl ketone, diethyl ketone, methyl isobutyl ketone, tetrahydrofuran, ethyl acetate, and butyl acetate and containing 1 to 10 weight % of water in a state of suspension being maintained throughout the reaction and eliminating the alkali metal from the resulting arylsulfonylureide compound alkali metal salt in the same solvent.
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