boron trifluoride diethyl etherate in toluene N2-atmosphere; refluxing W-complex with 3 equiv. of BF3 for 2 h; filtration (Al2O3/celite), evapn., sublimation (vac.);

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;

in toluene Schlenk techniques used; protective gas: N2; detailed description given; to stirred soln. of W(CO)3PMTA in toluene, BF3*OEt2 was added; reflux (2 h); cooling to room temp.;; filtration; evapn. to dryness; filtration of residue (through alumina/CH2Cl2 - hexane 1:4); evapn. to dryness; recrystn. (CH2Cl2/pentane/-20°C);;