PROCESS FOR PREPARING 3,5 DICHLORO-2,4 DIFLUORONITROBENZENE

摘要

3,5-Dichloro-2,4-difluoronitrobenzene can be prepared by reaction of 2,3,4,5-tetrachloronitrobenzene with fluorides of the heavy alkali metals in dimethyl sulphoxide (DMSO) or a DMSO-containing mixture, if the reaction is carried out at a temperature of 60-160 DEG C and for a reaction time of 20-0.2 hours and the reaction temperature and the reaction time are linked by the relationship T( DEG C)=A-33 log t(h), in which A assumes values from 100 to 137.