Synthesis and reactions of (tert-butylimido)bis(η-cyclopentadienyl)niobium cations: NMR evidence for d0olefincations [Nb{(η-C5H5)2}(NtBu)(η-C2H4)][B(C6F5)4] and [Nb{(η-C5H4)CMe2(η-C5H4)}(NtBu)(η-C2H3Me)][B(C6F5)4]
Abstract
The new (tert-butylimido)η-cyclopentadienylniobium compounds [Nb(η-C5H5)2(NtBu)(O3SCF3)] 1*, [Nb(η-C5H5)2(NtBu)(PMe3)][O3SCF3] 2*, [Nb(η-C5H5)2(NtBu)][MeB(C6F5)3] 3, [Nb(η-C5H5)2(NtBu)][B(C6F5)4] 4, [Nb(η-C5H5)2(NtBu)(η-C2H4)][B(C6F5)4] 5, [Nb{(η-C5H4)2CMe2}(NtBu)(O3SCF3)] 6, [Nb{(η-C5H4)2CMe2}(NtBu)][B(C6F5)4] 7, [Nb{(η-C5H4)2CMe2}(NtBu)(η-C2H4)][B(C6F5)4] 8 and [Nb{(η-C5H4)2CMe2}(NtBu)(η-C3H6)][B(C6F5)4] 9 have been prepared and characterised; * indicates the crystal structure has been determined.