公开(公告)号：DD201898A5

公开(公告)日：1983-08-17

申请号：DD23482881D

申请日：1981-11-13

Applicant: BASF AG

Inventor： TONNE PETER ,  JAEDICKE HAGEN

IPC: C07D275/06 ,  C07D275/04

Abstract: A process for the preparation of saccharin by reacting an aqueous hydrochloric acid solution of o-methoxycarbonylbenzenediazonium chloride with sulfur dioxide, wherein (a) the aqueous diazonium salt solution is reacted with sulfur dioxide at from 0 DEG to 100 DEG 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 reaction mixture is treated simultaneously or subsequently with a diazonium salt decomposition catalyst, (c) the aqueous organic reaction mixture, or the organic phase obtained after removing the aqueous phase, is treated with an oxidizing agent at from 0 DEG to 100 DEG C.