Reactions of Cp*Ta(NAr)Cl2 and CpM(NAr)Cl2 (M = Nb, Ta; Ar = 2,6-C6H3iPr2) with NaBH4 in the presence of an excess of PMe3 provided facile access to the corresponding dihydride derivatives CpRM(NAr)H2(PMe3) (CpR = Cp, Cp*). Reaction of Cp*Nb(NAr)Cl2 with NaBH4 in the absence of phosphine gave the Nb(+5) borohydride–hydride complex Cp*Nb(NAr)H(η2-BH4). When the corresponding reactions for CpM(NAr)Cl2 (M = Nb, Ta) were carried out in the absence of an excess of phosphine, dimeric MIV products [CpM(μ-NAr)(η2-BH4)]2 containing M–M single bonds were formed.
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