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Kinetically stable, four-coordinate vanadium(IV) neopentylidene complexes such as [(Nacnac)VCHtBu(thf)](BPh4) (Nacnac−=[Ar]NC(Me)CHC(Me)N[Ar], Ar=2,6-(CHMe2)2C6H3), which was prepared by oxidatively induced α-hydrogen abstraction from [(Nacnac)V(CH2tBu)2] with AgBPh4 in THF (see structure), contain the shortest VC bonds known to date.
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Basuli et al. (2004) studied this question.
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