H2O in tetrahydrofuran Treatment of suspn. of (Me-Acr)BPh4 in THF with NaV(CO)6 (N2 or Ar). Evolution of gas and pptn. of colorless solid is obsd. Stirring (15 h, room temp.).; Removal of solvent (vac.), treatment of residue with H2O, filtn., washing of org. solid (H2O), drying (vac.), anal. and spect. identification. Addn. of Bu4NBr to yellow soln. causes sepn. of V-compd. which is filtered and dried in vac.;