A process for preparing sulfonamides I
where the variables are each as defined in the description,
by reacting m-nitrobenzoyl chlorides II with amino sulfones III,
under the influence of B equivalents of base IV, wherein, in step a), the amino sulfone III is reacted with B1 equivalents of base IV, and, in step b), the reaction mixture resulting from step a) is reacted with m-nitrobenzoyl chlorides II and B2 equivalents of base IV;
where B, B1 and B2 are each as defined in the description.
[EN] PROCESS FOR THE PREPARATION OF 2-CHLORO-4-FLUORO-5-NITROBENZOTRICHLORIDE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 2-CHLORO-4-FLUORO-5-NITROBENZOTRICHLORURE
申请人:BASF AGRO BV
公开号:WO2018141642A1
公开(公告)日:2018-08-09
The present invention relates to an improved process for the preparation of 2-chloro-4-fluoro-5-nitrobenzotrichloride. The present invention further relates to a process for the purification of 2-chloro-4-fluoro-5-nitrobenzotrichloride, which reduces the isomeric impurities and acidic by-products.