in diethyl ether (glovebox or high vac.); Et2O vac. transferred to LiN(CH3)2, cooled to 0°C, suspn. of Mo-complex in Et2O added, stirred for 4 h, stirred at 23°C for 48 h; Et2O removed in vacuo, cooled with dry ice/acetone mixt., residue heatedto 80°C for 2 h at 1E-3 Torr, collected;

distn. at 70°C under 1E-3 mmHg;

in diethyl ether dry atmosphere; stoich. amts.; addn. of ligand to Mo-complex (-78°C), warming (room temp.), stirring (overnight, 1 atm), refluxing (2 h),avpan (vac.); pentane addn. (pptn., -78°C), drying (reduced pressure); elem. anal.;