Cationic Vanadium(IV) Methyl Complexes [Cp2VMe(CH3CN)][B(C6H5)4] and [Cp2VMe(THF)][MeB(C6F5)3]

The cationic vanadocene alkyl complex [Cp 2 VMe(CH 3 CN)] + with [BPh 4 ] - counteranion was structurally established. The reaction of Cp 2 VMe 2 in THF in the presence of B(C 6 F 5 ) 3 is also described: EPR evidence of the intermediate formation of the [Cp 2 VMe(THF)] + species, which gives, via a disproportionation redox reaction, the V III species [Cp 2 V(THF)][Me B(C 6 F 5 ) 3 ], is demonstrated.