p-Nitro-acetophenone was prepared by diezotizing p-amino-acetophenone in fluoroboric acid solution and replacing the diazonium fluoroborat,: group by the nitro group in presence of finely divided copper as catalyst. Yield 55-60% m.p. 76-78℃. Recrystaliization from alcohol gave a product of m. p. 80℃.