Cocondensation of niobium or tantalum atoms with an excess of butadiene and tetrahydrofuran yields the diamagnetic, crystalline compounds M(η-MeC3H4)(η-C4H6)2, M = Nb or Ta.
P. R. Brown, F. G. N. Cloke and M. L. H. Green, J. Chem. Soc., Chem. Commun., 1980, 1126 DOI: 10.1039/C39800001126
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