1: 36 percent / nBu3P, Br2 / dimethylformamide 2: 50 percent / KOtBu, 18-C-6 / tetrahydrofuran; hexamethylphosphoric acid triamide 3: 400 °C / flash vacuum pyrolysis View Scheme

1: 50 percent / KOtBu, 18-C-6 / tetrahydrofuran; hexamethylphosphoric acid triamide 2: 400 °C / flash vacuum pyrolysis View Scheme

T=400°C; flash vacuum pyrolysis;

T=500°C; N2 flow;