Water → 2,2'-Bis(trifluoromethyl)-4,4'-dinitrobiphenyl

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Activated copper (45 g) was added to a solution of 2-bromo-5-nitro-benzotrifluoride (50 g) in 100 ml of dimethylformamide and the mixture refluxed for 5 hours. The cooled mixture was poured into excess water and the resulting brown precipitate collected by filtration, washed with water and dried. Chromatography over silica gel gave 25 g (71% yield) of ##STR6## 2,2'-bis(trifluoromethyl)-4,4'-dinitro-1,1'-biphenyl, recrystallized as shiny yellow prisms from ether, m.p. 138°-140° C.

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