N,N,N',N,-tetramethylethylenediamine; methyl iodide in tetrahydrofuran byproducts: LiI; under Ar; MeI and tmeda dissolved in hexane; dropwise addn. to soln. of W-compound at -78°C; warmed to room temp.; stirred for 30 min; cooled to -78°C; slowly addn. of dissolved MeI; warmed to room temp.; filtered; removal of solvent in high vac.; extn. (Et2O); Et2O was removed in high vac.; column chromy. (silica gel, pentane/Et2O) at -40°C; 1. band was concd.; cooled to -35°C; crystn.; 2. band: C6H5Me-complex; elem. anal.; NMR; IR;