Zwitterionic, Ring-Borylated Vanadium(III) Complexes from [Cp2VCO] and B(C6F5)3

The reaction of the vanadium(II) carbonyl [Cp 2 V(CO)] and B(C 6 F 5 ) 3 resulted in formation of zwitterionic, ring-borylated vanadium(III) complexes [(Cp)(C 5 H 4 B(C 6 F 5 ) 3 )V] ( 3 ) and [(Cp)(C 5 H 4 B(C 6 F 5 ) 3 )V(CO) 2 ] ( 4 ) and of the salt [Cp 2 V(CO) 2 ][HB(C 6 F 5 ) 3 ] ( 5 ). All were characterized by crystallography. Formation of a hydride vanadium(IV) [(Cp)(C 5 H 4 B(C 6 F 5 ) 3 )VH(CO)] obtained by the electrophilic addition of the borane at the Cp-ring followed by redox and disproportionation reaction is suggested to account for these results.