Variable-temperature 13C n.m.r. spectra of 3,7-dialkyl-1,5-diazabicyclo[3.3.1]nonan-9-ones unambiguously establish a boat–chair ⇌ chair–boat equilibrium rather than the fixed double-chair conformation which had previously been proposed.
Y. Takeuchi, P. Scheiber and K. Takada, J. Chem. Soc., Chem. Commun., 1980, 403 DOI: 10.1039/C39800000403
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