The tetra-azacyclotetradecadiene obtained from ethylenediamine and benzylideneacetone has the cisoid structure (I) while that obtained from ethylenediamine monoperchlorate and mesityl oxide has the transoid structure (IV).
O. H. Hankovszky, K. Hideg, D. Lloyd and H. McNab, J. Chem. Soc., Chem. Commun., 1974, 378 DOI: 10.1039/C39740000378
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