T=150°C;

1: 1) conc. H2SO4, NaNO2, 2) 10 M H2SO4 / 1) H2O, 0 deg C, 2) reflux 2: 76 percent / K2CO3 / acetone / Heating 3: 83 percent / N,N-diethylaniline / Heating 4: 96 percent / CH3COONa / 1 h / Heating 5: 60 percent / Br2, acetic acid / Ambient temperature 6: 55 percent / 5percent KOH / ethanol / Heating 7: 94 percent / K2CO3 / acetone / Heating View Scheme