Di-t-butyl derivatives of 3a,5a-dihydro-3H-cyclobuta[b]pyrroles, synthesized from photoisomers of 1H-azepine derivatives (Dewar azepines), isomerized thermally to 3H-azepines.
K. Satake, H. Saitoh, M. Kimura and S. Morosawa, J. Chem. Soc., Chem. Commun., 1988, 1121 DOI: 10.1039/C39880001121
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