The unsymmetrical boat–chair BC conformation of (Z,Z)-cyclonona-1,3-diene is calculated to be 5 kJ mol–1 more stable than the axial-symmetrical twist-boat–chair TBC form; while the calculated energy barrier for limited pseudorotation of BC and TBC is only 10.2 kJ mol–1, ring inversion of BCvia plane-symmetrical boat geometry requires 24.4 kJ mol–1.
, ,. and ,., J. Chem. Res. (S), 1999, 616 DOI: 10.1039/A903133B
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