Method A.--A solution of 1.81 g.(0.010 mole) of methyl 4-nitrobenzoate and 1. 97 g.(0.010 mole) of 2, 4, 6-trichlorophenol in 16 g. of fuming sulfuric acid containing 0.008 mole of sulfur trioxide was heated 6 hours at 70".(Alternatively, 2, 4, 6-trichlorophenyl acetate was heated for 30 minutes with 4-nitrobenzoic acid or for 6 hours with methyl 4-nitrobenzoate.) ilfter cooling, the solution was poured onto ice aiid filtered. The crude wet product mixture was ...
