Abstract
Reactions of two free NHCs 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene (IPr) and 1,3-dimesitylimidazol-2-yliden (IMes) with group VB metals MCl5 (M = Ta, Nb) gave a mono-(NHC) complex 1 and two bis-(NHC) complexes 2 and 3 with the high oxidation states of Nb(v) and Ta(v).
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