X-Ray structural and EHMO studies show that two electrons are sequentially removed from a W–W δ* orbital on oxidation of the bis(metallacyclopentadiene) complex [W2(µ-C4Me4)2(η-C5H5)2] to [W2(µ-C4Me4)2(η-C5H5)2]z+(z= 1,2); the dication undergoes C–C coupling and proton loss in boiling MeCN to give [W2(µ-C8Me7CH2)(η-C5H5)2]+ which adds hydride ion to form the metallacyclononatetraene complex [W2(µ-C8Me8)(η-C5H5)2].
I. M. Bartlett, N. G. Connelly, M. S. Legge, A. J. Martín, B. Metz and A. G. Orpen, Chem. Commun., 1996, 1877 DOI: 10.1039/CC9960001877
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