Process for the preparation of an azidosulphonylbenzoic acid

Details Process for the preparation of an azidosulphonylbenzoic acid Process for the preparation of an azidosulphonylbenzoic acid

C - Chemistry, Metallurgy

07

C

260/472.6, 260/5

C07C 381/00 (2006.01) C08C 19/00 (2006.01)

Patent

CA 1285285

A B S T R A C T A PROCESS FOR THE PREPARATION OF AN AZIDOSULPHONYLBENZOIC ACID The invention relates to a process for the preparation of an azidosulphonylbenzoic acid which comprises reacting a water- soluble salt of a chlorosulphonylbenzoic acid with hydrazine (N2H4) in an aqueous medium, reacting the obtained hydrazino- sulphonylbenzoic acid salt with nitrous acid in the same aqueous medium, acidifying the resulting aqueous solution comprising the azidosulphonylbenzoic acid salt, to precipitate the azidosul- phonylbenzoic acid and separating the azidosulphonylbenzoic acid. The process is a one-pot process, which differs from a known process in that the intermediate, being the hydrazino- sulphonylbenzoic acid salt, is not isolated.

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