Heating of starting compd. (40°C, 1E-2 Torr) for 3 h, during which green color of solid turns gray.; Spect. (IR) identification of blue-black resulted solid as V(CO)6 and anal. and spect. (IR) identification of org. residue.;

in tetrahydrofuran byproducts: CO; Treating of starting compd. in the dark with THF, stirring (10 h, room temp.); Evolution of gas (CO by gas chromy.) occurs within the addn.' time. IR spectrum of yellow soln. reveals presence of V(CO)6 anion. Sepn. of colorless org. solid after partial evapn. of solvent, filtn., spect. identification.;