1: P-diphenyl(N-benzyl-N-methyl)-λ5-phosphinamide; sec.-butyllithium With N,N'-dimethyl-N,N'-propyleneurea in tetrahydrofuran; cyclohexane T=-90°C; 12 h; 2: benzyl bromide in tetrahydrofuran; cyclohexane T=-90°C; 2 h;