bis(acetylacetonate)nickel(II); triethylamine in toluene T=80°C; 0.5 h;

1: 86 percent / benzene; hexamethylphosphoric acid triamide / 6 h / Heating 2: 92 percent / NaOH / H2O / 1 h / Ambient temperature 3: 93 percent / 48percent HBr / acetic acid / 15 h / Heating 4: 84 percent / NH4OAc / acetic acid / 24 h / Heating View Scheme