N,N',N'-trimethylhydrazinium iodide; potassium tert-butylate in dimethyl sulfoxide T=18°C; 4 h;

1.1: Mg / diethyl ether 1.2: diethyl ether / 0.5 h / 20 °C 1.3: 10 percent / tetrachloro-1,2-benzoquinone / benzene / 48 h / 20 °C 2.1: 96 percent / aq. KOH / ethanol / 0.5 h / Heating View Scheme