Reaction of 1,4,7,10-tetra-azacyclododecane (cyclen) with 1,2-dibromoethane connects an adjacent pair of secondary amino groups, by means of an ethano bridge, reinforcing the macrocycle and allowing it to circumscribe rigidly nickel(II); an ion to which it would normally be bound in a folded conformation.
A. Ramasubbu and K. P. Wainwright, J. Chem. Soc., Chem. Commun., 1982, 277 DOI: 10.1039/C39820000277
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