triethylamine in diethyl ether T=-30 - 20°C; 3 h;

in tetrahydrofuran; diethyl ether Li salt in ether was rapidly added to soln. of W complex in THF at -30°C (N2), react. time 3 h; filtration through Celite, evapn., extn. with pentane, filtration, evapn., sublimation in vac., pptn. with MeCN from Et2O soln.; elem. anal.;