Inversion of the azepine ring in (3) requires a simultaneous inversion at the ring nitrogen and this accounts for the high energy barrier involved and also for the existence of stereoisomers in the case of (6).
R. S. Atkinson and N. M. Gawad, J. Chem. Soc., Chem. Commun., 1984, 557 DOI: 10.1039/C39840000557
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