1: With magnesium; mercury dichloride in methanol T=20 - 50°C; 24 h; 2: With potassium hydroxide in methanol T=20°C; 24 h; Further stages.;

1.1: 42 percent / (Me2N)3P=NP(NMe2)2=NEt / tetrahydrofuran / 20 °C 2.1: Mg; HgCl2 / methanol / 24 h / 20 °C 2.2: 38 percent / KOH / methanol / 24 h / 20 °C View Scheme

1.1: 70 percent / (Me2N)3P=NP(NMe2)2=NEt / tetrahydrofuran / 20 °C 2.1: Mg; HgCl2 / methanol / 24 h / 20 °C 2.2: 50 percent / KOH / methanol / 24 h / 20 °C View Scheme