tris(dimethylamino)(methylimino)phosphorane in tetrahydrofuran; diethyl ether 24 h; Ambient temperature;

in hexane combining (Me3Si)PhPH soln. with (Me3Si)Al.Et2O soln. at -78 °C, warming to 25 °C, stirring 4 h, evapn. of solvent, redissolution of resulting oil in hexane, refluxing for 48 h ; under inert gas; concn., decantation, washing of residue with cold hexane (improvement of yield by collection of decanted liquids and filtrates and crystn. from hexane at -20 °C), drying in vacuo;

T=120 - 160°C; 1 h; or with phenylphosphine (100 deg C, 40 min);