Preparation of saccharin

Details Preparation of saccharin Preparation of saccharin

C - Chemistry, Metallurgy

07

D

260/309.1

C07D 275/06 (2006.01)

Patent

CA 1168247

Abstract or the disclosure: A process for the preparation of saccharin by reacting an aqueous hydrochloric acid solu- tion of o-methoxycarbonylbenzenediazonium chloride with sulfur dioxide, wherein a) the aqueous diazonium salt solution is reacted with sulfur dioxide at from 0 to 100°C in the presence of a water-immiscible or only partially water-miscible inert organic solvent, b) in order to decompose the diazonium salt, the reac- tion mixture is treated simultaneously or subsequently with a diazonium salt decomposition catalyst, c) the aqueous organic reaction mixture, or the org- anic phase obtained after removing the aqueous phase, is treated with an oxidizing agent at from 0 to 100°C and d) the organic phase is reacted with aqueous ammonia at from 0 to 50°C and the saccharin is isolated from the aqueous phase in a conventional manner by acidifying with a strong acid.

390267

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