N,N,N',N',N'',N''-hexamethylphosphoric triamide; n-butyllithium in benzene 1 h; Heating;

in benzene 1 h; Heating;

in tetrahydrofuran 0.25 h; Ambient temperature;

in benzene byproducts: LiCl; (N2); suspn. of Li compd. was treated with AlMe2Cl (1:1 mol) and stirred for 1 h at room temp.; isolation by filtration, washing with hexane and drying in vac.; product contains the formed LiCl, not sepd.; elem. anal.;