trans-Isomers of the title oxazepines, e.g.(2) and (6), but not the cis-isomers, e.g.(5), undergo an unusual dimerisation from the liquid state; X-ray analysis shows that the crystalline dimer (7; R = Et) contains a 14-membered heterocyclic ring.
D. A. Whiting, R. Cahill and T. A. Crabb, J. Chem. Soc., Chem. Commun., 1972, 1307 DOI: 10.1039/C39720001307
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