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Article Dans Une Revue Journal of Organometallic Chemistry Année : 2000

Preparation of trichloro- and tribromocyclopentadienyltungsten(IV)

Résumé

The thermal decarbonylation of (Ring)WX3(CO)2 in refluxing toluene has led to the preparation of the CO-free compounds [(Ring)WX3]2 [Ring=η5-C5H5 (Cp) and X=Cl (1a) or Br (1b); Ring=η5-C5H4Me (Cp′), X=Cl (2a) or Br (2b); Ring=η5-C5Me5 (Cp*), X=Cl (3)]. The NMR properties of these molecules are consistent with diamagnetism and thereby indicate a different structure from that of the paramagnetic molybdenum analogues. Compounds 1a and 2a react with dppe to afford mononuclear 18-electron adducts, (Ring)WCl3(dppe) (Ring=Cp (4) or Cp′ (5)). The X-ray structure of 5 shows a pseudo-fac-octahedral geometry with the dppe ligand occupying two equatorial (e.g. cis relative to Cp′) coordination sites. The X-ray structure of two by-products of the synthetic processes are also reported, e.g. Cp′3W3Cl3(μ2-Cl)2(μ3-O) (6) and [Cp*WCl3]2(μ-O) (7).
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Dates et versions

hal-03299456 , version 1 (04-10-2021)

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Haley Blackburn, James Fettinger, Heinz-Bernhard Kraatz, Rinaldo Poli, Raymund Torralba. Preparation of trichloro- and tribromocyclopentadienyltungsten(IV). Journal of Organometallic Chemistry, 2000, 593-594, pp.27-35. ⟨10.1016/S0022-328X(99)00292-2⟩. ⟨hal-03299456⟩
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