Process for producing arylsulfonylureide compounds

• Main Authors: SASAKI, NOBUAKI, KAWABATA, TOSHIHIKO, MATSUMOTO, MANSUKE, SAWANO, BUNJI
• Format: Patent
• Language: English; French; German
• Published: 25.11.1998
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

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) (Ar -SO2NHCONH)n-Ar wherein Ar represents an aromatic residue; Ar 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) Ar -SO2NH.B wherein B represents an alkali metal with an aromatic isocyanate compound of general formula (3) Ar -(NCO)n 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.