1 H and 13C n.m.r. studies of the title compound demonstrate that only the cycloheptadienyl group becomes stereochemically rigid at temperatures > –100°C, the cycloheptatrienyl group remaining fluxional at this temperature; from the reported X-ray structure, the molecule probably undergoes at least three independent modes of topological rearrangement.
T. H. Whitesides and R. A. Budnik, J. Chem. Soc., Chem. Commun., 1974, 302 DOI: 10.1039/C39740000302
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