methyllithium in tetrahydrofuran; diethyl ether T=0 - 25°C; 2 h; Inert atmosphere;

in toluene T=-78 - 22°C; 18 h; Inert atmosphere;

in not given byproducts: C5(CH3)5H; (Ar);

in tetrahydrofuran To a soln. of orthovanadate-compd. ZnCl2 was added, mixt. was heated to 60°C with stirring in a vac.-sealed ampoule under Ar (5 h).; Solvent was removed under vac., (t-BuO)4V was recovered by sublimation at 90°C (1 mm Hg), the dry residue was extd. with THF/hexane at 60°C, react. was monitored by ESR, elem. anal.;