PURPOSE: To produce the subject compound with a simple procedure in high yield at a low cost while suppressing the by-production of isomers by reacting 4-chlorobenzenesulfonic acid with chlorobenzene under specific condition.
CONSTITUTION: The objective compound is produced by reacting 4- chlorobenzenesulfonic acid with chlorobenzene under atmospheric pressure at 130-250°C for 1-20hr under stirring without adding a dehydration agent to the reaction mixture. The water formed during the reaction is continuously removed as an azeotropic mixture with chlorobenzene and the chlorobenzene is separated from the obtained azeotropic mixture and returned to the reaction mixture. The objective compound is useful as a raw material for heat-resistant resins such as polysulfone and polyether sulfone and an intermediate for various pharmaceuticals.
TAKAHASHI TORU
SUZUKI MICHINORI
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