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X\u2010ray analysis revealed that these compounds had nonplanar helical structures with unusual contacts, C=O\u22c5\u22c5\u22c5C=O 2.467\u2005\u00c5, between the inner carbonyl groups. The role of n\u22c5\u22c5\u22c5\u03c0* interactions in the short contacts was evaluated using a noncovalent interaction plot and natural bond orbital analysis. The dynamic process involving helical inversion was observed by the variable temperature <jats:sup>1<\/jats:sup>H NMR measurement of a derivative with 2,4,6\u2010trimethylphenyl groups, and the barrier was estimated to be 77\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup>. DFT calculations indicated that the helical inversion proceeded via a multistep mechanism. 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