copper in N,N-dimethyl-formamide 20 h; Heating;

1: 2.1 g / copper powder / dimethylformamide / 20 h / Heating 2: 95 percent / activated iron / benzene 3: 1.) sodium nitrite, conc. H2SO4; 2.) potassium iodide / 1.) water, 0-5 deg C, 1.5 h; 2.) water, to 80 deg C 4: 269 mg / copper powder / 265 - 270 °C View Scheme

copper T=240°C; 1 h;

copper T=240°C; 1 h;