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DOI: 10.1039/A702758C (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 3579-3584

Mono(cyclopentadienyl) and ansa-bis(cyclopentadienyl)imido derivatives of Group 5 and 6 transition metals; crystal structures of [M{(η-C5H4)CMe2(η-C5H4)}(NR)X] (M = Nb, R = SiMe3, X = Cl; R = But, X = Cl, Br or I; M = Ta, R = But, X = Cl)[hair space]†

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Nigel J. Bailey, Jonathan A. Cooper, Hartmut Gailus, Malcolm L. H. Green, J. Thomas James and Michael A. Leech

Abstract

The new half-sandwich mono(cyclopentadienyl)tungsten compounds [W(η-C5H4Me)(NBut)Cl3] and [W(η-C5H4Me)(NBut)(L)Cl] (L = η-C2H4 or η-MeC2Me) have been synthesized. In addition, the ansa-bis(cyclopentadienyl) Group 5 compounds [M{(η-C5H4)CMe2(η-C5H4)}(NR)X] (M = V, R = But, X = Cl; M = Nb, R = SiMe3, X = Cl;* R = But, X = Cl,* Br,* I[hair space]* or Me; M = Ta, R = But, X = Cl[hair space]* or Me) are reported. An asterisk indicates that the compound has been structurally characterized. Attempts to prepare the related dichloride compounds by replacement of the imido functionality in [M{(η-C5H4)CMe2(η-C5H4)}(NBut)Cl] (M = V, Nb or Ta) using HCl led to decomposition, suggestive of a labilising of the cyclopentadienyl rings by the strongly bonding imido ligand.

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