t-BuLi in tetrahydrofuran; pentane under Ar atm. to soln. Fe complex in THF t-BuLi in pentane was added at -78°C, stirred for 5 min, R2PCl was added, allowed to warm to r.t. and stirred for 16 h; react. mixt. was quenched with aq. NaHCO3, org. phase was separated, washed with water and dried over MgSO4, solvent was removed in vacuo, residue was chromd. on alumina (PE-Et2O-Et3N 100:2:1 -> 60:3:1 -> 20:3:1); elem. anal.;