N,N,N',N',N'',N''-hexamethylphosphoric triamide; ammonium chloride 1.) THF, -50 deg C, 4 h; 2.) water, -80 deg C; Yield given. Multistep reaction;

isopropylmagnesium chloride T=-80°C;

in tetrahydrofuran; diethyl ether -80 deg C, 30 min, -70 deg C, 30 min;