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.
本发明通过一个简单的步骤,提供了高产率和高纯度的具有
显色剂价值的芳基磺酰
脲化合物。本发明生产通式(1)的芳基磺酰
脲化合物的技术
(Ar1-SO2NHCONH)n-Ar2 (1)
其中 Ar1 代表芳香族残基;Ar2 代表二价或三价芳香族残基;n 代表 2 或 3 的整数 包括使通式(2)的芳基磺
酰胺碱
金属盐反应
Ar1-SO2NH-B (2)
其中 B 代表碱
金属与通式(3)的芳香族
异氰酸酯化合物反应
Ar2-(NCO)n (3)
在至少一种选自
乙腈、
丙酮、
甲乙酮、
二乙基酮、
甲基异丁基酮、
四氢呋喃、
乙酸乙酯和
乙酸丁酯的溶剂中,并含有 1 至 10 重量%的
水
在整个反应过程中保持悬浮状态,并
在相同的溶剂中消除所得芳基磺酰
脲化合物碱
金属盐中的碱
金属。