The title complex exhibits a temperature-dependent 1H n.m.r. spectrum indicative of proton averaging between –25 and 75 °C. The stable molecular conformation was inferred from the limiting spectrum below –25 °C. The averaging of diene protons was interpreted in terms of a planar rotation of the ligand and the energy barrier calculated from the temperature dependence was about 14 kcal mol–1.
S. Otsuka and T. Taketomi, J. Chem. Soc. A, 1971, 583 DOI: 10.1039/J19710000583
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