Process for the preparation of 3,5-dichloro-2,4-...

Details Process for the preparation of 3,5-dichloro-2,4-... Process for the preparation of 3,5-dichloro-2,4-...

C - Chemistry, Metallurgy

07

C

260/611

C07C 201/12 (2006.01) C07C 205/12 (2006.01)

Patent

CA 1300172

Process for the preparation of 3,5-dichloro-2,4-difluoro- nitrobenzene A b s t r a c t 3,5-Dichloro-2,4-difluoro-nitrobenzene can be produced by reacting 2,3,4,5-tetrachloro-nitrobenzene with fluorides of heavy alkali metals in dimethylsulph- oxide (DMSO) or in a DMSO-containing mixture, when the reaction is carried out at a temperature of 60-160°C and a reaction time of 20-0.2 hours, and the reaction temperature and reaction time are linked by the relation- ship T(°C)-A-33 log t(h), in which A assumes values from 100 to 137. Le A 24 612 -US

553876

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