1: 41 percent / diethyl ether / 2 h / Heating 2: 93 percent / sodium bisulfate / 0.33 h / 190 °C 3: N-chlorosuccinimide, hexamethylphosphoramide / 16 h / 100 °C View Scheme

1: 41 percent / diethyl ether / 2 h / Heating 2: 93 percent / sodium bisulfate / 0.33 h / 190 °C 3: N-chlorosuccinimide, hexamethylphosphoramide / 16 h / 100 °C View Scheme

N,N,N',N',N'',N''-hexamethylphosphoric triamide; N-chloro-succinimide T=100°C; 16 h;

sodium hydride in tetrahydrofuran 20 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;